Backend Engineer Jobs in Berlin, EEA

<p data-pm-slice="1 1 []">SumUp builds simple, affordable financial tools that help small businesses get paid, manage their money, and grow. Beyond payments, we offer a number of financial products - including business banking, card products, lending, and invoicing — giving merchants everything they need to manage their payments and finances in one place.<br><br>The <strong>Cards squad </strong>is a core part of that, owning the systems that power card issuing, lifecycle management, and transaction processing for merchants across Europe. We handle millions of card transactions every day, and we're now scaling those systems to support new product capabilities while laying the foundations for a more global, resilient platform. That's why we're growing the team and looking for a seasoned backend engineer who can take real ownership of complex, high-impact work. If you want to build systems that genuinely matter to small businesses and you're excited by the technical depth that comes with high-throughput, distributed architecture, this is the role for you.</p> <p data-pm-slice="1 1 []">🎥 Get a feel for our Berlin office <a class="text-primary underline cursor-pointer" href="https://www.youtube.com/watch?v=9DG64C3moeQ" target="_blank">here</a>.</p> <h3 data-pm-slice="1 3 []">What you'll do</h3> <ul> <li>Own and lead the end-to-end delivery of backend services within the Cards EU domain, including observability, testing, and production support</li> <li>Contribute to the technical roadmap by participating in architectural discussions and proposing solutions for complex, distributed systems challenges</li> <li>Raise well-scoped pull requests, conduct thorough code reviews, and help maintain high standards of code quality and test coverage across the team</li> <li>Collaborate closely with engineers in adjacent squads and with the product manager to shape and refine the squad backlog</li> <li>Participate in incident reviews and the on-call rotation, taking accountability for the reliability of the services you build</li> <li>Apply and champion AI tooling to accelerate engineering workflows, and help raise the team's overall AI literacy</li> </ul> <h3 data-pm-slice="1 3 []">You'll be great for this role if…</h3> <ul> <li>Solid, hands-on experience delivering production-ready backend services end-to-end, including testing, monitoring, and maintenance, on a modern cloud-native stack</li> <li>Production <strong>experience with Kotlin</strong> and interest in working with a number of other languages (Java, Golang and Elixir)</li> <li>Solid understanding of distributed systems, API design, data modelling, and working with relational databases</li>

In the Global Bank tribe , we're building the infrastructure to provide merchants with a digital business account that empowers them to manage their banking needs. Our goal is to become the most popular banking partner for small merchants globally with an effortless, simple, and affordable experience. As part of the Bank Activation and Revenue team, you will join a high-impact growth engine within the bank. Our mission is to guide merchants in unlocking the most value out of their SumUp Business Account during their activation journey: we aim to convert 100% of SumUp's ecosystem users into active Bank users. We own the critical journey from the moment a merchant opens an account until they understand how the business account can solve their business needs, making it part of their daily routine. To achieve this at scale, we are building a greenfield activation and engagement platform consisting of a series of initiatives and experiments to drive adoption and engagement of SumUp users with the business account . Your work will directly drive revenue by enabling seamless cross-selling of the entire SumUp product suite to millions of merchants. What You'll Do Build Greenfield Services: Design and implement the trifecta of services (Banners, Rewards, and Feature Toggles) from the ground up to power global product experimentation. Drive Activation: Create the technical logic that tracks and incentivizes users through their first five meaningful transactions, ensuring a smooth path to becoming a long-term banking partner. Own the Stack E2E: We follow a "build it, run it, own it" model. You will be responsible for the full lifecycle of your features, from architectural design to production monitoring. High-Velocity Engineering: Participate in a culture of daily deliveries. We value moving fast, testing hypotheses, and iterating based on real-world data. Bridge Client & Backend: Build robust APIs that power the mobile and web banking experience while managing complex asynchronous processing for rewards and incentives via Kafka. Collaborate with Stakeholders: Work closely with other engineering teams across the Bank and the wider SumUp ecosystem to ensure our activation tools are easily integrable and highly scalable. You'll be great for this role if Strong technical foundation: Solid backend development experience in Golang , with interest in working across multiple languages (Kotlin, Elixir). You understand system architecture, object-oriented and functional design principles, data modeling, and API design (RESTful and event-driven). Growth Mindset: You're curious and energized by complex problem-solving. You thrive in environments with fast iterations and careful design, where understanding the problem deeply is valued over rushing to delivery. You're excited by the opportunity to architect critical systems from scratch - like our new global banner service - and work in a team that follows a "build it, run it" model with daily deliveries. Systems Pr

In the Global Bank tribe , we're building the infrastructure to provide merchants with a digital business account that empowers them to manage their banking needs. Our goal is to become the most popular banking partner for small merchants globally with an effortless, simple, and affordable experience. You'll help us transition from fragmented regional setups to a unified global infrastructure, directly enabling millions of merchants worldwide to access seamless banking tailored to their needs. As a Senior Backend Engineer on the Global Accounts team, you'll own critical pieces of our bank account platform. You'll help us design and build a fully distributed, event-driven system designed to scale across regions with resilience and compliance built in. You'll work primarily in Kotlin, with opportunities in Elixir and Golang. We practice Extreme Programming: small iterations, daily deliveries, and a focus on technical design quality and deep problem understanding. Our tech stack includes Kotlin, Golang, Elixir, Java, AWS, Kafka, PostgreSQL, and Kubernetes, supported by observability tools like Prometheus, Grafana, and Honeycomb. We also use AI-assisted development tools including Cursor and GitHub Copilot. What You'll Do Build critical infrastructure from scratch: Contribute to the design and implementation of a newly architected global accounts platform. You'll help migrate existing systems to a modern, event-driven, decoupled architecture that enables scalability and resilience across regions. Master event-driven architecture: You'll be working extensively with Kafka to build a truly decoupled, resilient system. Event-driven architecture is essential to our goal of ensuring that failures in one part of the system don't bring down banking operations globally. This isn't just a technical requirement—it's the foundation of building a platform that can handle the complexities of multi-region banking. Solve complex compliance challenges: Design flexible systems that handle varying regulatory and verification requirements across different regions and use cases. You'll make compliance requirements maintainable and natural rather than an afterthought. Enable other teams: Build a self-service platform that empowers internal teams across the organization to contribute to and build on top of. Work globally: Your work will directly impact EU and LATAM markets, with potential US expansion on the horizon. You'll Be Great for This Role If Strong technical foundation: Solid backend development experience in Kotlin , with interest in working across multiple languages (Golang, Elixir). You understand system architecture, object-oriented and functional design principles, data modeling, and API design (RESTful and event-driven). Event-driven architecture expertise: Proven experience with Kafka and event-driven systems. You understand how this enables true decoupling and resilience in distributed systems. Distributed systems mastery: You've built tested, observable, s

SumUp builds simple, affordable financial tools that help small businesses get paid, manage their money, and grow. Beyond payments, we offer a number of financial products - including business banking, card products, lending, and invoicing — giving merchants everything they need to manage their payments and finances in one place. The Cards squad is a core part of that, owning the systems that power card issuing, lifecycle management, and transaction processing for merchants across Europe. We handle millions of card transactions every day, and we're now scaling those systems to support new product capabilities while laying the foundations for a more global, resilient platform. That's why we're growing the team and looking for a seasoned backend engineer who can take real ownership of complex, high-impact work. If you want to build systems that genuinely matter to small businesses and you're excited by the technical depth that comes with high-throughput, distributed architecture, this is the role for you. 🎥 Get a feel for our Berlin office here . What you'll do Own and lead the end-to-end delivery of backend services within the Cards EU domain, including observability, testing, and production support Contribute to the technical roadmap by participating in architectural discussions and proposing solutions for complex, distributed systems challenges Raise well-scoped pull requests, conduct thorough code reviews, and help maintain high standards of code quality and test coverage across the team Collaborate closely with engineers in adjacent squads and with the product manager to shape and refine the squad backlog Participate in incident reviews and the on-call rotation, taking accountability for the reliability of the services you build Apply and champion AI tooling to accelerate engineering workflows, and help raise the team's overall AI literacy You'll be great for this role if… Solid, hands-on experience delivering production-ready backend services end-to-end, including testing, monitoring, and maintenance, on a modern cloud-native stack Production experience with Kotlin and interest in working with a number of other languages (Java, Golang and Elixir) Solid understanding of distributed systems, API design, data modelling, and working with relational databases Hands on experience in containerisation, orchestration, and CI/CD practices Ability to take an ambiguous product problem, define the technical approach, and lead it through to implementation with minimal guidance Comfort working across teams and communicating clearly in written and spoken English in a professional setting Genuine curiosity about the product domain — comfortable applying a backend lens during feature refinement and thinking beyond the code to understand how your work shapes the user experience Why you should join SumUp 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves

About the team: The Commercial Systems and Intelligence squad is a newly formed team within SumUp's Acquisition Mission under the Run & Grow tribe. We sit at the intersection of data, backend engineering, and sales operations, building the infrastructure that powers how SumUp attributes merchant acquisition, calculates commissions, and understands the full lifecycle of every merchant. Today, these processes are largely manual. We're here to change that, automating what's opaque, and building systems that sales representatives, leadership, and analysts can actually trust. You'll join at the very beginning, helping to shape how the squad works, the architecture it builds on, and the standards it holds itself to.   What you'll do: Aggregating data from across the SumUp ecosystem to determine which acquisition channel or sales agent drove a merchant to take a valuable action (e.g. signing up, adopting a product) Establishing data models, API contracts, and rule definitions that automate existing manual commission workflows for field and tele-sales agents, partnerships and merchant referrals Build the Lifecycle Event Log in close collaboration with the Merchant Intelligence squad. A centralized store of curated merchant lifecycle events (signups, product usage, verification, purchases) used across attribution, recommendations, customer support and sales Build internal backoffices and APIs for sales representatives and leaders to monitor commission and modify commission plans, manage portfolios and resolve disputes Define and document API contracts, schemas, and integration patterns that other engineering teams can adopt confidently Establish best practices for testing, observability, and incident response within a newly formed squad Use AI and agentic coding tools deliberately, to scaffold services, write tests, explore unfamiliar code, and draft documentation while maintaining full accountability for what gets shipped   You'll be great for this role if you: Bring a strong backend engineering background in Go, or are a typed-language generalist ready to ramp up quickly Have designed APIs and distributed systems with clear contracts, versioning, and integration patterns Are fluent in relational and analytical databases (PostgreSQL, Snowflake) and comfortable making the right choice for the right use case Have built Kafka-based, event-driven systems and understand event sourcing and CDC patterns Have experience in auditable, high-trust systems where every decision must be traceable — fintech, payments, or similar domains Have built services from scratch in greenfield, early-stage squads with limited prior context,  and are energized, not unsettled, by that challenge Have experience with testing, observability, and incident response practices and treat them as first-class concerns, not afterthoughts Are resourceful and adaptable, you take end-to-end ownership, do more with less, and adjust quickly as priorities shift Can bridge technic

<p><strong>About the team:</strong></p> <p>The Commercial Systems and Intelligence squad is a newly formed team within SumUp's Acquisition Mission under the Run & Grow tribe. We sit at the intersection of data, backend engineering, and sales operations, building the infrastructure that powers how SumUp attributes merchant acquisition, calculates commissions, and understands the full lifecycle of every merchant.</p> <p>Today, these processes are largely manual. We're here to change that, automating what's opaque, and building systems that sales representatives, leadership, and analysts can actually trust. You'll join at the very beginning, helping to shape how the squad works, the architecture it builds on, and the standards it holds itself to.</p> <p> </p> <p><strong>What you’ll do:</strong></p> <ul> <li>Aggregating data from across the SumUp ecosystem to determine which acquisition channel or sales agent drove a merchant to take a valuable action (e.g. signing up, adopting a product)</li> <li>Establishing data models, API contracts, and rule definitions that automate existing manual commission workflows for field and tele-sales agents, partnerships and merchant referrals</li> <li>Build the Lifecycle Event Log in close collaboration with the Merchant Intelligence squad. A centralized store of curated merchant lifecycle events (signups, product usage, verification, purchases) used across attribution, recommendations, customer support and sales</li> <li>Build internal backoffices and APIs for sales representatives and leaders to monitor commission and modify commission plans, manage portfolios and resolve disputes</li> <li>Define and document API contracts, schemas, and integration patterns that other engineering teams can adopt confidently</li> <li>Establish best practices for testing, observability, and incident response within a newly formed squad</li> <li>Use AI and agentic coding tools deliberately, to scaffold services, write tests, explore unfamiliar code, and draft documentation while maintaining full accountability for what gets shipped</li> </ul> <p> </p> <p><strong>You’ll be great for this role if you:</strong></p> <ul> <li>Bring a strong backend engineering background in Go, or are a typed-language generalist ready to ramp up quickly</li> <li>Have designed APIs and distributed systems with clear contracts, versioning, and integration patterns</li> <li>Are fluent in relational and analytical databases (PostgreSQL, Snowflake) and comfortable making the right choice for the right use case</li> <li>Have built Kafka-based, event-driven systems and understand event sourcing and CDC patterns</li> <li>Have experience in auditable, h

<p data-pm-slice="1 1 []">SumUp builds simple, affordable financial tools that help small businesses get paid, manage their money, and grow. Beyond payments, we offer a number of financial products - including business banking, card products, lending, and invoicing — giving merchants everything they need to manage their payments and finances in one place.<br><br>The <strong>Cards squad </strong>is a core part of that, owning the systems that power card issuing, lifecycle management, and transaction processing for merchants across Europe. We handle millions of card transactions every day, and we're now scaling those systems to support new product capabilities while laying the foundations for a more global, resilient platform. That's why we're growing the team and looking for a seasoned backend engineer who can take real ownership of complex, high-impact work. If you want to build systems that genuinely matter to small businesses and you're excited by the technical depth that comes with high-throughput, distributed architecture, this is the role for you.</p> <p data-pm-slice="1 1 []">🎥 Get a feel for our Berlin office <a class="text-primary underline cursor-pointer" href="https://www.youtube.com/watch?v=9DG64C3moeQ" target="_blank">here</a>.</p> <h3 data-pm-slice="1 3 []">What you'll do</h3> <ul> <li>Own and lead the end-to-end delivery of backend services within the Cards EU domain, including observability, testing, and production support</li> <li>Contribute to the technical roadmap by participating in architectural discussions and proposing solutions for complex, distributed systems challenges</li> <li>Raise well-scoped pull requests, conduct thorough code reviews, and help maintain high standards of code quality and test coverage across the team</li> <li>Collaborate closely with engineers in adjacent squads and with the product manager to shape and refine the squad backlog</li> <li>Participate in incident reviews and the on-call rotation, taking accountability for the reliability of the services you build</li> <li>Apply and champion AI tooling to accelerate engineering workflows, and help raise the team's overall AI literacy</li> </ul> <h3 data-pm-slice="1 3 []">You'll be great for this role if…</h3> <ul> <li>Solid, hands-on experience delivering production-ready backend services end-to-end, including testing, monitoring, and maintenance, on a modern cloud-native stack</li> <li>Production <strong>experience with Kotlin</strong> and interest in working with a number of other languages (Java, Golang and Elixir)</li> <li>Solid understanding of distributed systems, API design, data modelling, and working with relational databases</li>

At SumUp, the  Global Bank team builds the core infrastructure and services that give merchants a digital bank account, helping small businesses manage their money easily and reliably.  The Balance Management Squad sits at the core of the Global Bank Platform. Right now, our team is completing a major milestone: consolidating and modernizing our balance management system in Europe. The next big step is creating a global transaction history service; a single, shared platform used by all regions to give merchants consistent and transparent views of their financial activity. As a (Senior) Backend Engineer , you'll help modernize existing systems while balancing innovation with stability, collaborate with teams across regions, and build reliable services that manage diverse markets with different regulations. If you enjoy solving complex problems on high-load systems, are curious about banking, and are looking for a team that tackles challenges head-on, we'd love to hear from you. What You'll Do Build and evolve the SumUp's core banking services that powers ledger operations and transactions, transforming our regional systems into a unified, scalable global platform. Tackle complex distributed systems challenges, ensuring resilient services that continue to perform under high transaction volumes. Support modernization initiatives by improving observability, adding test coverage, refactoring code for long-term maintainability, and gradually introducing new architectural patterns without disrupting live banking operations. Contribute to key architectural decisions - build ledger and transaction history systems from the ground up, ensuring a globally scalable banking solution for our clients. Collaborate with teams across Risk, Treasury, Finance, and Infrastructure to ensure smooth, compliant, and reliable global operations Take ownership from design to production, running the services you build, monitoring their performance, and continuously improving how we deliver high-quality software at scale. You'll be great for this role if You have solid backend experience building reliable, high-volume services and you think carefully about system design, APIs, data modeling, and how services interact. You are proficient in Golang and comfortable learning and working with other languages as needed, e.g. Kotlin or Elixir. You write maintainable, well-tested code, follow CI/CD best practices, and take responsibility for the software you build from development to production. You're comfortable building, deploying, and running services in cloud environments like AWS using Docker and Kubernetes. You're eager to learn about relational databases that perform well under load and maintain data consistency. You are a collaborator who enjoys working across regions, communicating clearly, exchanging feedback effectively, and making thoughtful technical decisions together. You have a curiosity for building reliable financial services and banking domain It's a plus

SumUp's Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. As a Backend Engineer in the Orders & Sales or Catalog Platform team, you will build the engine powering core infrastructure for over 4 million businesses worldwide. Whether you are architecting global sales APIs or scaling item management systems, your work is central to the SumUp ecosystem. The Orders & Sales team builds high-performance APIs and receipt engines that unify transaction and sales data, utilizing an AI-native mindset and extreme collaboration. Meanwhile, the Catalog Platform team owns the backend for item management, variants, categories, and taxes, focusing on high-stakes reliability and core POS infrastructure scaling. What you'll do Develop and evolve high-performance backend services and APIs using Kotlin and Spring Boot . Design and maintain robust data schemas and event-driven integrations (Kafka) to handle complex transaction and catalog data at scale. Write clean, well-tested, production-grade code and contribute meaningfully to code reviews and team rituals. Collaborate with mobile and product teams to ship end-to-end features with a focus on performance and data consistency. Engage in daily pair programming to solve complex concurrency challenges and maintain high architectural standards. Take full ownership of the development lifecycle, including managing CI/CD pipelines and monitoring service health in production. Actively use and experiment with AI coding agents to automate repetitive tasks and increase shipping velocity. Refactor and migrate mission-critical domain logic to centralize and simplify the "Sales" and "Catalog" experiences across the ecosystem. You'll be great for this role if You have 3+ years of experience in backend engineering with the JVM stack (preferably Kotlin and Spring Boot ). You have a solid understanding of software design patterns, data modeling, and fundamental system architecture principles. You are comfortable working with Kafka , Postgres , and AWS in a production environment at scale. You enjoy and actively seek out collaboration and daily pair programming as a primary way of working. You are an "AI-native" engineer, open to using agents and tools to optimize your coding process. You have experience with, or a strong interest in, distributed and fault-tolerant systems. You are a fast learner who values quality, detail, and effective time management. You are fluent in English and can communicate clearly with both technical and non-technical stakeholders. Nice to have Experience with Kubernetes and cloud-native observability/monitoring tools. Knowledge of different programming paradigms (Functional vs. OOP). Familiarity with high-scale applications involving many concurrent processes. A desire to share knowl

Atolls is the world's largest community-driven shopping platform, active in 20+ markets.  We help millions make smarter spending decisions across discovery, evaluation, and (re-)purchase by connecting people with the right brands and retailers. Our 1,000+ team across 10 countries builds products used every day at global scale, where you'll have real ownership and see your impact. Want to shape the destinations people rely on to shop with confidence? Keep reading. About This Role: We are looking for a Senior Backend Engineer (TypeScript, NestJS/Node.js) to join our Fulfilment team in Berlin or remotely from Germany. In this role, you will build and improve the backend systems behind cashback, reward processing, partner integrations, and reliable fulfilment flows across Atolls' reward platforms. You will work on stable, scalable services that sit close to the customer experience, helping users earn, track, and redeem cashback with more clarity, trust, and fewer points of friction. Our Benefits: At Atolls, we believe in nurturing both your professional and personal growth. Here's what you can expect:     •    A culture that values personal and professional development, with internal mobility opportunities.     •    A supportive and open-minded team that embraces diverse perspectives and innovative ideas.     •    32 days of paid vacation plus your birthday off, giving you the time you need to recharge.     •    A flexible hybrid working scheme to balance work and life.     •    Access to a learning budget and internal training to help you grow in your role.     •    Mental health coaching to support your well-being.     •    Regular global and local get-togethers to celebrate successes and build connections.     •    The possibility of taking a sabbatical after three years with the company.     •    A cloud-based company setup, providing flexibility and collaboration opportunities no matter where you are. *These are global benefits that apply to all employees, with additional local perks based on your location. Responsibilities: As a Backend/ Full-Stack Engineer, you will: Build and improve backend services that support cashback, redemption, fulfilment flows, and reliable reward experiences across Atolls platforms. Develop scalable APIs and services using TypeScript, Node.js, NestJS, and related backend technologies, with a focus on reliability and maintainability. Collaborate with Product, Engineering, and business stakeholders to translate fulfilment needs into clear technical solutions. Integrate and maintain partner APIs, third-party systems, and internal services that support transaction and reward processing. Improve performance, observability, testing, and documentation across services that sit close to the customer cashback journey. Guide technical decisions,

Meet Urban Sports Club We are among the leading platforms for sports and wellness in Europe, dedicated to inspiring people to live active, healthy lives. With just one membership we offer access to thousands of fitness and wellness experiences across the continent. But what truly sets us apart? We believe our people are at the heart of everything we do. If you're curious about how we work, what we value and how you might grow with us, explore our Culture Hub & Career Opportunities . *Big news: Wellhub and Urban Sports Club unite!* Urban Sports Club is now a proud part of Wellhub, creating a global wellbeing ecosystem. Together, we connect 39,000 corporate clients and 97,000 wellness partners across 18 countries, offering millions of people even more ways to stay active and take care of their health. The opportunity  We are looking for an experienced Senior Backend Engineer to join our Foundation Engineering team. In this role, you won't just be building features for a single product; You will be crafting the very core services that power the entire Urban Sports Club ecosystem. The Foundation team sits at the heart of our engineering organization. We are responsible for application-level, system-wide services that enable our multi-million user base to interact with our platform seamlessly. Your initial focus will be taking ownership of our critical Identity & Authentication services and our core Search backend , with exciting plans to architect and scale a centralized Notification service in the near future. You will act as a force multiplier for our entire engineering department. By designing highly scalable, secure, and performant internal APIs and services, you will enable other product teams to build fast and deliver value to our users. If you love deep-diving into system design, solving complex architectural challenges at the application level, and working with Golang, this is the perfect place for you. This position will be based in Berlin. What you will do Own Core System Services: Architect, develop, and maintain high-throughput, application-level foundational services, focusing initially on identity/authentication and our core search backend service. Drive Technical Evolution: Design and implement future shared services that support our vision for scaling the platform. Enable Engineering Teams: Build clean, robust, and well-documented internal APIs and developer tools that empower other product teams to build features rapidly and securely. Write Exceptional Code: Deliver highly testable, maintainable, and secure Golang code, taking full operational ownership of the components your team develops. Foster Best Practices: Actively participate in the Urban Sports Club backend cluster, championing strong system design, modularized architecture, and automated testing across the company. Collaborate Across Boundaries: Work closely with product owners, tech leads, and other engineering teams to understand their requirements and transl

<h2><strong>About the Job</strong></h2> <p>As a key growth accelerator, A11 partners with Europe’s most ambitious startups and scaleups, corporates, and SMBs to connect them with top-tier talent ready to make an impact.</p> <p>We’re looking for an experienced Senior Backend Engineer (m/f/d) to be a technical anchor across the team at our Ecosystem Company. </p> <p>You will operate with a high degree of autonomy while staying deeply embedded in collaborative engineering culture.</p> <p><strong>Tech Stack:</strong> Java 21 (Spring Boot 3), Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript, Next.js, React.</p> <p><strong>Join the A11 Ecosystem – </strong>A next-generation supply chain platform, the company is redefining how one of the world’s largest industries sources, distributes, and finances materials. Engineered to unlock the full potential of global trade, it harnesses agentic AI and workflow automation to provide seamless, high-efficiency access to premium materials at scale. Since its commercial rollout, the platform has fueled exponential growth, optimizing procurement for thousands of businesses while setting new benchmarks for speed, transparency, and efficiency. Its competitive edge lies in full digitization and AI-driven supply chain management automation, eliminating inefficiencies and creating a direct, intelligent bridge between suppliers and buyers. With a team of 80+ FTEs across Europe (Berlin HQ), China, and India, the company is rapidly scaling toward profitability, driving triple-digit million GMV, and setting new industry standards in autonomous, AI-powered supply chain orchestration.</p> <h2><strong>In this role, you’ll:</strong></h2> <ul> <li>Take ownership of complex backend systems from design through production — including architecture, implementation, and long-term maintenance</li> <li>Lead technical discussions, drive engineering decisions, and document trade-offs clearly for the team</li> <li>Mentor junior and mid-level engineers through code reviews, pairing sessions, and structured feedback</li> <li>Identify systemic weaknesses in our infrastructure, propose improvements, and execute on them with minimal direction</li> <li>Collaborate across engineering, product, and data to align technical direction with business goals</li> <li>Drive improvements to observability, reliability, and performance across our backend stack</li> <li>Contribute to hiring by participating in technical interviews and helping define the engineering bar</li> </ul> <h2><strong>Your Profile</strong></h2> <ul> <li>7+ years of backend engineering experience, with a track record of owning critical system

<h2><strong>About the Job</strong></h2> <p>As a key growth accelerator, A11 partners with Europe’s most ambitious startups and scaleups, corporates and SMBs to connect them with top-tier talent ready to make an impact. </p> <p>We’re looking for an experienced <strong>Backend Engineer (m/f/d)</strong> to work on the backend infrastructure that handles payments, financial data, reconciliation, and compliance-critical workflows — systems where correctness and auditability are non-negotiable.</p> <p><strong>Join the A11 Ecosystem – </strong>A next-generation supply chain platform, the company is redefining how one of the world’s largest industries sources, distributes, and finances materials. Engineered to unlock the full potential of global trade, it harnesses agentic AI and workflow automation to provide seamless, high-efficiency access to premium materials at scale. Since its commercial rollout, the platform has fueled exponential growth, optimizing procurement for thousands of businesses while setting new benchmarks for speed, transparency, and efficiency. Its competitive edge lies in full digitization and AI-driven supply chain management automation, eliminating inefficiencies and creating a direct, intelligent bridge between suppliers and buyers. With a team of 80+ FTEs across Europe (Berlin HQ), China, and India, the company is rapidly scaling toward profitability, driving triple-digit million GMV, and setting new industry standards in autonomous, AI-powered supply chain orchestration.</p> <h2><strong>In this role, you’ll:</strong></h2> <ul> <li>Design and implement backend services for payment processing, invoicing, reconciliation, and smart financial reporting</li> <li>Build robust, auditable data pipelines that ensure accuracy and traceability across all financial operations</li> <li>Develop and maintain integrations with payment gateways, banking APIs, and financial data providers</li> <li>Enforce data integrity standards and implement patterns for idempotency, retry logic, and failure handling in financial flows</li> <li>Collaborate with compliance and product teams to translate regulatory requirements into technical implementation</li> <li>Contribute to fraud detection logic, rate limiting, and access control mechanisms that protect financial operations</li> <li>Own incidents end-to-end — investigate, resolve, and drive post-mortems to improve system reliability</li> </ul> <p><strong>Tech Stack:</strong> Java 21 (Spring Boot 3), Python, PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript</p> <h2><strong>Your Profile: </strong></h2> <ul> <li>5-7+ years of backend engineering experience, with meaningful exposure to FinTech, payments, or finan

<h2><strong>About the Job</strong></h2> <p>As a key growth accelerator, A11 partners with Europe’s most ambitious startups and scaleups, corporates and SMBs to connect them with top-tier talent ready to make an impact. </p> <p>We’re looking for an experienced <strong>Backend Engineer (m/f/d)</strong> to help shape the systems that make operations predictable and scalable for our client's customers.</p> <p><strong>Join the A11 Ecosystem – </strong>A next-generation supply chain platform, the company is redefining how one of the world’s largest industries sources, distributes, and finances materials. Engineered to unlock the full potential of global trade, it harnesses agentic AI and workflow automation to provide seamless, high-efficiency access to premium materials at scale. Since its commercial rollout, the platform has fueled exponential growth, optimizing procurement for thousands of businesses while setting new benchmarks for speed, transparency, and efficiency. Its competitive edge lies in full digitization and AI-driven supply chain management automation, eliminating inefficiencies and creating a direct, intelligent bridge between suppliers and buyers. With a team of 80+ FTEs across Europe (Berlin HQ), China, and India, the company is rapidly scaling toward profitability, driving triple-digit million GMV, and setting new industry standards in autonomous, AI-powered supply chain orchestration.</p> <h2><strong>In this role, you’ll:</strong></h2> <ul> <li>Design and build backend services that power supply chain workflows — from order management to LSP integrations and real-time tracking</li> <li>Develop event-driven pipelines that process high-throughput logistics data reliably and at scale</li> <li>Build and maintain integrations with third-party logistics providers, ERPs, and warehouse management systems</li> <li>Own and evolve the data models that represent complex supply chain entities: shipments, inventory positions, fulfillment nodes</li> <li>Identify performance bottlenecks and lead the engineering effort to resolve them in production systems</li> <li>Work with LLM APIs (OpenAI, Anthropic, Gemini) to build intelligent workflows and automation</li> <li>Collaborate closely with Product and domain experts to translate operational complexity into clean technical solutions</li> <li>Contribute to architecture decisions and raise the engineering bar through rigorous code reviews and documentation</li> </ul> <p><strong>Tech Stack:</strong> Java 21 (Spring Boot 3), Python, PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript</p> <h2><strong>Your Profile: </strong></h2> <ul> <li>5-7+ years of experience in backend engineering, ideall

<h2><strong>About the Job</strong></h2> <p>As a key growth accelerator, A11 partners with Europe’s most ambitious startups and scaleups, corporates, and SMBs to connect them with top-tier talent ready to make an impact.</p> <p>We’re looking for a motivated <strong>Backend Engineer (</strong><strong>AI</strong><strong> Agents/Workflows) (m/f/d)</strong> to join and drive backend development processes at our Ecosystem Company.</p> <p>As a <strong>Backend Engineer</strong>, you’ll build, scale, and optimize backend services that bring <em>AI</em>-driven <br><br>Join the A11 Ecosystem – A next-generation supply chain platform, the company is redefining how one of the world’s largest industries sources, distributes, and finances materials. Engineered to unlock the full potential of global trade, it harnesses agentic AI and workflow automation to provide seamless, high-efficiency access to premium materials at scale. Since its commercial rollout, the platform has fueled exponential growth, optimizing procurement for thousands of businesses while setting new benchmarks for speed, transparency, and efficiency. Its competitive edge lies in full digitization and AI-driven supply chain management automation, eliminating inefficiencies and creating a direct, intelligent bridge between suppliers and buyers. With a team of 80+ FTEs across Europe (Berlin HQ), China, and India, the company is rapidly scaling toward profitability, driving triple-digit million GMV, and setting new industry standards in autonomous, AI-powered supply chain orchestration.</p> <h2>In this role, you’ll:</h2> <ul> <li>Design, develop, test, deploy, and maintain backend services that integrate <em>AI</em>/ML capabilities into our products</li> <li>Build clean, maintainable, and reusable code with a focus on scalability and performance</li> <li>Develop and optimize APIs that power <em>AI</em>-driven features</li> <li>Collaborate with frontend engineers to connect user-facing experiences with <em>AI</em>-enabled backend logic</li> <li>Implement and improve distributed systems and data pipelines</li> <li>Work with LLM APIs (OpenAI, etc.) to build intelligent workflows and automation</li> <li>Participate in code reviews, knowledge-sharing sessions, and architecture discussions</li> <li>Stay current with emerging <em>AI</em> technologies and backend best practices</li> </ul> <h2><strong>Your Profile: </strong></h2> <ul> <li>3–5 years of experience as a backend or full-stack engineer, with exposure to <em>AI</em>/ML integrations</li> <li>Solid programming skills in Java (Spring Boot) and familiarity with Python for data pr

A newly funded cybersecurity startup in Berlin is looking for a Founding Backend Engineer (Go) to join as a founding team member and help build the technical foundations of a next-generation AI-powered security risk management platform. We are an early-stage startup founded by experienced cybersecurity leaders with backgrounds in Israeli Intelligence units. We are looking for a highly motivated, hands-on, and product-minded Founding Backend Engineer for a hybrid role based in central Berlin, Potsdamer Platz. If you are passionate about cybersecurity and AI technology, thrive in fast-paced startup environments, and enjoy building complex platforms from scratch, this is an opportunity to make a real impact. We are seeking an experienced Go engineer to design and build the core backend architecture of the platform from day one. You will develop scalable cloud-native services, APIs, data models, messaging systems, and AI-driven capabilities using technologies such as Go, AWS, Kubernetes, PostgreSQL, Neo4j, Kafka, Terraform, LangChain, Bedrock, and pgvector. The ideal candidate has at least five years of Go experience, a strong hands-on coding mentality, and experience supporting production SaaS platforms. You should be comfortable taking full technical ownership, troubleshooting systems end to end, working closely with the CEO, CPTO, product, frontend, and DevOps teams, and making critical architectural decisions in an early-stage startup environment. The position is hybrid and requires regular presence in the Berlin office. Candidates should already be based in Berlin or be willing to relocate within a short timeframe. Tasks Develop and maintain backend applications using Go Design and optimize cloud-based solutions using AWS services (EC2, Lambda, S3, SQS, SNS, etc.) Design, use and manage databases, including PostgreSQL, Neo4J, Redis, and Elasticsearch Develop, manage, and optimize containerized applications using Docker Automate processes using Bash/Python scripting Optimize and maintain RESTful APIs, ensuring security and performance Work closely with frontend engineers, DevOps, and product team to deliver robust applications Monitor, debug, and improve backend performance, reliability, and scalability Implement caching, messaging queues, and event-driven architectures where needed Build whole platform from scratch Requirements 5+ years of GoLang experience Hands-on coding mentality; can build things from scratch and familiar with different architectures Hands-on experience with Docker, Kubernetes (EKS) and containerized workloads Experience designing RESTful and gRPC APIs and using frameworks like Gin Hands-on experience with messaging systems (e.g., SQS , Kafka ) Experience with CI/CD pipelines (GitHub Actions or similar) Experience operating PostgreSQL (RDS / Aurora), Neo4J(or similar) Experience with AI agents , LLM-based systems, MCP, RAG, Prompts, Embeddings, Vector, etc Experience with AI stack (AWS Bedrock, LangChain, pgvector or similar

<div class="content-intro"><p><strong>ABOUT TALON.ONE:</strong></p> <p> </p> <p>Talon.One is the most powerful incentives engine that unifies loyalty, promotions and gamification into one holistic platform. Backed by enterprise-grade security and scalability, Talon.One empowers companies to build personalized, profitable promotions and loyalty programs using any data.</p> <p>Today, over 250 of the world’s most-loved brands including Adidas, Sephora and Carlsberg work with Talon.One to drive deeper engagement and lasting loyalty with their customers.</p> <p> </p></div><p><strong>ABOUT THE TEAM:</strong></p> <p>Our development team consists of specialists in frontend, backend, QA, product, and visual design. We work in small cross-functional teams that give everybody insight and hands-on experience of what everyone else is doing. Each team is self-sustained, autonomous, and responsible for a specific feature or area in our platform. We believe in strong collaboration, open communication, and mentoring to allow bi-directional growth. We are working to make Talon.One an inclusive workplace because we believe it is the right thing to do and because we want to have a positive impact on the entire tech industry.</p> <p>We are currently looking for a Senior Backend Engineer to join our development teams. You will work closely with our product people to design the right solutions to our challenging problems while collaborating, mentoring, and supporting the other team members.</p> <p>For this position, we need professionals who are already based in Berlin or willing to move to Berlin.</p> <p> </p> <p><strong>ONCE YOU ARE HERE YOU WILL:</strong></p> <ul> <li>Lead and deliver features of any size — independently or by coordinating effort across the squad</li> <li>Drive technical discovery and solution design in collaboration with your PM and Tech Lead</li> <li>Actively share technical knowledge across the Backend Guild — through discussions, documentation, and knowledge-sharing sessions</li> <li>Participate in cross-squad (Backend Guild) brainstorming sessions and problem-solving discussions</li> <li>Mentor and unblock junior and mid-level engineers through pairing, code review, and deliberate feedback</li> <li>Champion improvements to quality, maintainability, and engineering process within your squad and beyond</li> <li>Be a crucial member in a small cross-functional team (a squad)</li> <li>Contribute effectively during all Scrum rituals, facilitation of process maturity increments, and engineering best practices initiatives</li> <li>Regularly participate in code reviews and provide constructive feedback</li> <li>Co