Backend Engineer Jobs in Berlin, EEA

<div class="content-intro"><p><span data-contrast="none"><strong>About the Company</strong></span></p> <p><span data-contrast="none"><strong>Affinidi </strong>is a technology company dedicated to changing data ownership for good. We empower businesses and individuals with control and ownership of their data, with a comprehensive approach to managing their holistic identity – accounting for all aspects of their digital footprint while ensuring privacy and security. </span></p> <p><span data-contrast="none">Affinidi’s technology enables users to benefit from decentralised digital identity solutions. We believe that everyone has the right to own and control their data, and we are committed to creating a trusted digital credentials ecosystem that empowers businesses and individuals to securely exchange data and services across borders and industries.</span></p> <hr> <p> </p></div><p><strong>About the role:  </strong></p> <p><span class="TextRun SCXW29471199 BCX0" lang="EN-US" data-contrast="none"><span class="NormalTextRun SCXW29471199 BCX0">We are in search of a</span><span class="NormalTextRun SCXW29471199 BCX0"> </span><span class="NormalTextRun SCXW29471199 BCX0">solution-oriented </span></span><span class="TextRun MacChromeBold SCXW29471199 BCX0" lang="EN-US" data-contrast="none"><span class="NormalTextRun SCXW29471199 BCX0">Senior</span><span class="NormalTextRun SCXW29471199 BCX0"> Software Engineer (Backend)</span></span><span class="TextRun SCXW29471199 BCX0" lang="EN-US" data-contrast="none"><span class="NormalTextRun SCXW29471199 BCX0"> with </span><span class="NormalTextRun SCXW29471199 BCX0">demonstrable</span><span class="NormalTextRun SCXW29471199 BCX0"> </span><span class="NormalTextRun SCXW29471199 BCX0">experience </span><span class="NormalTextRun SCXW29471199 BCX0">in</span></span><span class="TextRun SCXW29471199 BCX0" lang="EN-US" data-contrast="auto"><span class="NormalTextRun SCXW29471199 BCX0"> </span></span><span class="TextRun MacChromeBold SCXW29471199 BCX0" lang="EN-US" data-contrast="auto"><span class="NormalTextRun SCXW29471199 BCX0">Rust</span><span class="NormalTextRun SCXW29471199 BCX0">, </span></span><span class="TextRun SCXW29471199 BCX0&qu

<div class="content-intro"><p><span data-contrast="none"><strong>About the Company</strong></span></p> <p><span data-contrast="none"><strong>Affinidi </strong>is a technology company dedicated to changing data ownership for good. We empower businesses and individuals with control and ownership of their data, with a comprehensive approach to managing their holistic identity – accounting for all aspects of their digital footprint while ensuring privacy and security. </span></p> <p><span data-contrast="none">Affinidi’s technology enables users to benefit from decentralised digital identity solutions. We believe that everyone has the right to own and control their data, and we are committed to creating a trusted digital credentials ecosystem that empowers businesses and individuals to securely exchange data and services across borders and industries.</span></p> <hr> <p> </p></div><p><strong>About the role:  </strong></p> <p><span class="TextRun SCXW29471199 BCX0" lang="EN-US" data-contrast="none"><span class="NormalTextRun SCXW29471199 BCX0">We are in search of a</span><span class="NormalTextRun SCXW29471199 BCX0"> </span><span class="NormalTextRun SCXW29471199 BCX0">solution-oriented </span></span><span class="TextRun MacChromeBold SCXW29471199 BCX0" lang="EN-US" data-contrast="none"><span class="NormalTextRun SCXW29471199 BCX0">Senior</span><span class="NormalTextRun SCXW29471199 BCX0"> Software Engineer (Backend)</span></span><span class="TextRun SCXW29471199 BCX0" lang="EN-US" data-contrast="none"><span class="NormalTextRun SCXW29471199 BCX0"> with </span><span class="NormalTextRun SCXW29471199 BCX0">demonstrable</span><span class="NormalTextRun SCXW29471199 BCX0"> </span><span class="NormalTextRun SCXW29471199 BCX0">experience </span><span class="NormalTextRun SCXW29471199 BCX0">in</span></span><span class="TextRun SCXW29471199 BCX0" lang="EN-US" data-contrast="auto"><span class="NormalTextRun SCXW29471199 BCX0"> </span></span><span class="TextRun MacChromeBold SCXW29471199 BCX0" lang="EN-US" data-contrast="auto"><span class="NormalTextRun SCXW29471199 BCX0">Rust</span><span class="NormalTextRun SCXW29471199 BCX0">, </span></span><span class="TextRun SCXW29471199 BCX0&qu

<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>Be a crucial member in a small cross-functional team (a squad)</li> <li>Collaborate closely with Product Manager and Tech Lead during roadmap discussions</li> <li>Contribute effectively during all Scrum rituals, facilitation of process maturity increments, and engineering best practices initiatives</li> <li>Provide valuable inputs during Refinement and Solution Design sessions and be able to lead feature development independently</li> <li>Regularly participate in code reviews and provide constructive feedback</li> <li>Consistently monitor the maintenance of quality standards and proactively recommend engineering or process  improvements</li> <li>Offer technical/soft guidance to Junior engineers and participate in Mentorship Programs</li> <li>Participate in cross-squad (Backend Guild) brainstorming sessions and problem-solving discussions</li> <li>Propose and own technical initiatives toward performance/scale/maintenance improvements</li> </ul> <p>&

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

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

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

We're looking for a talented  Senior Kotlin Engineer (m/f/d) to join us in Berlin or Munich.    In the Foundation Division of FlixTech, our Finance Technology Stream helps the business grow efficiently by delivering smart, compliant, and automated finance solutions. We keep things simple for our internal users so they can spend less time on manual tasks and more time on what matters. The team you will join is not focused on user-facing experiences or polished UIs. Our success is measured by data correctness, consistency, and trustworthiness, even in complex and evolving business scenarios. You'll be part of a self-managed, cross-functional team with a Product Owner and fellow Software Engineers, directly supporting new country launches, new business models, and the continuous evolution of Flix's financial backbone.   This role is well-suited for someone who enjoys ownership, working close to real business problems, and contributing to the long-term foundations of an international company. If you value collaboration, thoughtful engineering, and building systems that need to be right, not just fast, we'd love to meet you.   About the Role Design, develop, and maintain backend services using Kotlin   Build and evolve scalable, event-driven systems that process, validate, and expose financial data   Own features end-to-end: from technical design and implementation to testing, deployment, monitoring, and ongoing maintenance   Collaborate closely with the Product Owner and Finance stakeholders to translate business requirements into robust technical solutions   Ensure data accuracy, traceability, and auditability across financial and accounting flows   Improve system reliability, observability, and performance for business-critical processes   Contribute to clean code, architectural discussions, and continuous improvement of engineering practices   About You 5 years of experience as a Software Engineer   working with Kotlin   Hands-on experience building backend services using the Spring ecosystem (e.g. Spring Boot, Spring Data)   Experience with event-driven design (e.g. asynchronous processing, messaging, domain events)   Practical experience with cloud platforms (preferably AWS, or similar)   Solid understanding of databases, both NoSQL (e.g. DynamoDB) and/or relational systems   Comfortable working in complex, data-heavy domains (ideally Finance), where investigation, analysis, and precision are key   Communicate clearly in English, open-minded, curious, and motivated to continuously improve both yourself and the systems you work on   We recognize that everyone carries a unique set of valuable skills and experiences. If you think you could have an impact even though you don't meet 100% of the requirements, we still encourage you to apply. We want to hear from you!   What We Offer Travel perks : 12 fre

We're looking for a talented  Senior Kotlin Engineer (m/f/d) to join us in Berlin or Munich.    In the Foundation Division of FlixTech, our Finance Technology Stream helps the business grow efficiently by delivering smart, compliant, and automated finance solutions. We keep things simple for our internal users so they can spend less time on manual tasks and more time on what matters. The team you will join is not focused on user-facing experiences or polished UIs. Our success is measured by data correctness, consistency, and trustworthiness, even in complex and evolving business scenarios. You'll be part of a self-managed, cross-functional team with a Product Owner and fellow Software Engineers, directly supporting new country launches, new business models, and the continuous evolution of Flix's financial backbone.   This role is well-suited for someone who enjoys ownership, working close to real business problems, and contributing to the long-term foundations of an international company. If you value collaboration, thoughtful engineering, and building systems that need to be right, not just fast, we'd love to meet you.   About the Role Design, develop, and maintain backend services using Kotlin   Build and evolve scalable, event-driven systems that process, validate, and expose financial data   Own features end-to-end: from technical design and implementation to testing, deployment, monitoring, and ongoing maintenance   Collaborate closely with the Product Owner and Finance stakeholders to translate business requirements into robust technical solutions   Ensure data accuracy, traceability, and auditability across financial and accounting flows   Improve system reliability, observability, and performance for business-critical processes   Contribute to clean code, architectural discussions, and continuous improvement of engineering practices   About You 5 years of experience as a Software Engineer   working with Kotlin   Hands-on experience building backend services using the Spring ecosystem (e.g. Spring Boot, Spring Data)   Experience with event-driven design (e.g. asynchronous processing, messaging, domain events)   Practical experience with cloud platforms (preferably AWS, or similar)   Solid understanding of databases, both NoSQL (e.g. DynamoDB) and/or relational systems   Comfortable working in complex, data-heavy domains (ideally Finance), where investigation, analysis, and precision are key   Communicate clearly in English, open-minded, curious, and motivated to continuously improve both yourself and the systems you work on   We recognize that everyone carries a unique set of valuable skills and experiences. If you think you could have an impact even though you don't meet 100% of the requirements, we still encourage you to apply. We want to hear from you!   What We Offer Travel perks : 12 fre

Backend Engineer, Berlin at Airapps. Apply via Ashby.