Backend Engineer Jobs in Paris, EEA

Senior Backend Engineer (Golang) - Draft Showdown at Voodoo. Apply via Ashby.

Senior Backend Engineer (Golang) - Paper.io2 at Voodoo. Apply via Ashby.

Senior Backend Engineer (Python) - Blitz at Voodoo. Apply via Ashby.

Senior/Staff Backend Engineer - Golang at Voodoo. Apply via Ashby.

Senior Backend Engineer (Golang) - Castle Busters at Voodoo. Apply via Ashby.

Staff Backend Engineer (Golang) - BeReal at Voodoo. Apply via Ashby.

Staff Backend Engineer - Golang at Voodoo. Apply via Ashby.

Senior Backend Engineer (Golang) - BeReal at Voodoo. Apply via Ashby.

Backend Engineering Lead (TypeScript /Node.js) at Voodoo. Apply via Ashby.

Our mission and customers: We are creating the freedom for SMEs to succeed by delivering Europe's leading finance workspace with banking at its core, augmented by financial tools. We are proud to be rated 4.8 on Trustpilot, based on 55,000+ reviews. Our culture puts customer satisfaction at the core of what we do, as proven by our Net Promoter Score of 75 (more about our culture here). Our journey: Founded in 2017 by Alexandre and Steve, Qonto has grown to 1,600+ Qontoers serving over 600,000+ customers across 8 European countries. We have been profitable since 2023, and we are just getting started. Our beliefs: We hire for skills and potential. With 80+ nationalities, 45% women, of which 56% of women in our leadership team, diversity isn't a program; It's who we are. We've built a discrimination-free hiring process because the best teams are built on merit. AI at Qonto: AI is deeply embedded in how we work (here) - Every Qontoer gets unlimited access to the best AI tools. We want people who experiment without waiting for permission, push AI beyond the obvious, know when to trust it, and when to question it. ------------------------------------------------------------------------------------------------------ 🌏 Location: France, Germany, Spain, or Italy — full remote-friendly. Join us as a Senior Backend Engineer to build the AI-powered tooling that enables Qonto's financial crime compliance teams to make decisions faster and with greater confidence, directly supporting our path to a full banking licence. ➡️ As a Backend Engineer at Qonto, you will Build AI-integrated backend systems: Design and ship production-grade services that connect AI models (Claude, OpenAI, or open-source equivalents) to our compliance workflows, handling prompting, output parsing, and model behaviour in a real regulated-industry context Own service architecture end-to-end: Co-own design, reliability, and scalability from day one, no PM layer between you and the technical decisions that shape the product Automate AML/AFC compliance operations: Translate compliance agent workflows into software, from EDD automation to customer onboarding acceleration, with direct feedback from the ops teams you're helping Drive continuous improvement: From production monitoring to post-mortems, you track impact, flag regressions, and improve what's in your scope with your peers and manager Shape the technical direction: In a team of 5, every engineer carries architectural weight. You'll lead design discussions, anticipate risks, and contribute to how the platform evolves ➡️ What you can expect Short time-boxes and lean process: daily goals, light Kanban, ceremonies, you spend most of your time building, not in planning meetings AI is the product, not a side tool: this team's output is AI-powered compliance tooling. You'll use Claude or OpenAI to solve real problems, and you'll be expected to handle model behaviour reliably in production, not just use AI to go faster Direct roadmap ownership: no dedicated PM means you and the team define priorities, your judgment shapes what gets built next Close feedback loop: AML/AFC ops teams proactively raise needs and respond quickly to what you ship. Lead time reduction, prediction confidence, and agent throughput are the metrics that tell you it's working ➡️ Your future team You'll join a team of 5 engineers within Qonto's Financial Crime Compliance (FCC) domain, alongside Ioannis (Tech Lead) and a mix of Senior/Staff Backend Engineers and Machine Learning Engineers. You'll be part of a 190-strong backend engineering community within a 500+ Product Engineering department. One important clarification: this team does not build fraud detection engines or KYC/KYB rule engines. Those exist elsewhere at Qonto. This team builds the automation layer on top, turning model outputs into decisions that help compliance agents respond faster. It's a backend role at the intersection of AI integration and regulated-industry operations. ➡️ About you AI integration in production: You've shipped systems where AI (Claude, OpenAI, or open-source) is a core functional component, not a coding assistant, but the product itself. Strong backend foundation: Solid experience with large-scale web application architecture and real production constraints + Ideally experience in Python. Sound architectural judgment: You make confident system design decisions independently and can articulate the trade-offs. Product instinct without a PM: You're comfortable owning the full cycle: scoping, prioritizing, shipping, success metrics 

<h1><strong><span class="TextRun SCXW246265904 BCX0" lang="EN-US" data-contrast="auto"><span class="NormalTextRun SCXW246265904 BCX0">Senior SFCC Multicloud Backend Engineer (all genders)</span></span></strong></h1> <p><span class="TextRun SCXW246265904 BCX0" lang="EN-US" data-contrast="auto"><span class="NormalTextRun SCXW246265904 BCX0">Why Valtech? </span><span class="NormalTextRun SCXW246265904 BCX0">We’re</span> <span class="NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW246265904 BCX0">the</span> <span class="NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW246265904 BCX0">experience</span><span class="NormalTextRun SCXW246265904 BCX0"> innovation company </span><span class="NormalTextRun SCXW246265904 BCX0">- </span><span class="NormalTextRun CommentStart SCXW246265904 BCX0">a</span><span class="NormalTextRun SCXW246265904 BCX0"> trusted partner</span><span class="NormalTextRun SCXW246265904 BCX0"> to the world’s most recognized brands. To our people we offer </span><span class="NormalTextRun SCXW246265904 BCX0">growth opportunities, </span><span class="NormalTextRun SCXW246265904 BCX0">a </span><span class="NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW246265904 BCX0">values</span><span class="NormalTextRun SCXW246265904 BCX0">-driven culture, </span><span class="NormalTextRun SCXW246265904 BCX0">international </span><span class="NormalTextRun SCXW246265904 BCX0">careers</span><span class="NormalTextRun SCXW246265904 BCX0"> and the chance to shape the future of experience.</span></span><span class="EOP CommentStart SCXW246265904 BCX0" data-ccp-props="{}"> </span></p> <h3><strong><span data-contrast="auto">The opportunity</span></strong></h3> <p><span data-contrast="auto">At Valtech, you’ll find an environment designed for continuous learning, meaningful impact, and professional growth. Whether you're pioneering new digital solutions, challenging conventional thinking or building the next generation of customer experiences, your work will help transform industries.</span><span data-ccp-props="{}"> </span></p> <p><span data-contrast="auto">We are proud of:</span><span data-ccp-props="{}"> </span></p> <ul> <li><a href="https://www.valtech.com/work/?utm_source=greenhouse&

Backend Engineer (Go) at Prelude. Apply via Ashby.

Backend engineer at Nabla. Apply via Ashby.

Outsight’s software solutions track the motion of people and vehicles using 3D LiDAR data. Operators of transportation hubs like airports and train stations but also sport venues, road infrastructures and industrial sites can now access accurate and anonymous Spatial Intelligence data, in order to improve operations and increase user safety and satisfaction.   Our international team of scientists and engineers drive the development of our solutions from Paris, San Francisco, Sophia-Antipolis (Nice) & Hong Kong. To support our global outreach, we also operate a commercial office in Spain.   You can find below an interesting link about who we are and what we do : Insights about Outsight   Our Passenger Flow Traffic Monitoring solution is trusted by the world’s leading airports and train stations across four continents, including the most renowned hubs celebrated for their operational excellence and exceptional passenger experience.  We also deploy our solutions in other markets such as Tourism, Retail and Sports.   Additionally, our Car Traffic Remote Monitoring product is trusted by several Tier 1 customers, including BMW.   Context   This role focuses on bridging data warehouse storage with live execution engines. You will build and optimize the high-availability API layers, protocol engines, and streaming communication paths that expose core spatial context to downstream real-time applications.   Responsibilities   Develop and scale concurrent backend microservices responsible for high-throughput spatial data querying. Build, secure, and maintain high-performance context communication engines and Model Context Protocol (MCP) servers. Optimize streaming data pipelines and ensure robust websocket/gRPC data delivery mechanisms. Standardize organizational API structures, ensuring a decoupled architecture where the Spatial Apps group can consume data seamlessly. Requirements for the role You  must have native experience building Model Context Protocol (MCP) implementations, tool definitions, and JSON schemas that allow autonomous LLM agents to perform zero-shot data discovery.  High proficiency in leveraging automated execution frameworks to minimize administrative engineering boilerplate is required.   Why join us?   Be part of the team pioneering Spatial Intelligence solutions at unprecedented scale—the breakthrough technology transforming how the world’s most prestigious airports, infrastructure operators, and smart cities understand and optimize physical flows.   As a 7-time Gartner-recognized category-defining leader with dozens of global awards including “Edge AI Product of the Year,” “LiDAR Leader Award,” “CES Best of Innovation” and many more, we’re backed by 37 patents and deployments with the most prestigious (and challenging) customers across four continents.   Join our international team of world-class experienced engineers and business leaders solving humanity’s most complex spatial challenges, from passenger flow optimization to autonomous robotics coordination, while working at the cutting edge of 3D AI, LiDAR perception, and real-time analytics.   Supported by rock-solid investors including BNP Paribas, BPI France, Energy Innovation Capital and Demeter who back our long-term vision, this is your opportunity to shape how physical and digital worlds interact, with the resources, growth trajectory, and technical challenges that will accelerate your career in ways traditional companies cannot offer.   Outsight is an Equal Employment Opportunity employer that pursues and hires a diverse workforce. Outsighters don't make employment decisions on the basis of race, color, religion, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age, military status, or any other basis protected by local, state, or federal laws. Outsight also strives for a healthy and safe workplace, and prohibits harassment of any kind. If you have a disability or special need that requires accommodation, please let us know.

Outsight’s software solutions track the motion of people and vehicles using 3D LiDAR data. Operators of transportation hubs like airports and train stations but also sport venues, road infrastructures and industrial sites can now access accurate and anonymous Spatial Intelligence data, in order to improve operations and increase user safety and satisfaction.   Our international team of scientists and engineers drive the development of our solutions from Paris, San Francisco, Sophia-Antipolis (Nice), Singapore & Hong Kong. To support our global outreach, we also operate a commercial office in Spain.   You can find below an interesting link about who we are and what we do : Insights about Outsight   Our Passenger Flow Traffic Monitoring solution is trusted by the world’s leading airports and train stations across four continents, including the most renowned hubs celebrated for their operational excellence and exceptional passenger experience.  We also deploy our solutions in other markets such as Tourism, Retail and Sports.   Additionally, our Car Traffic Remote Monitoring product is trusted by several Tier 1 customers, including BMW.   Context   We are looking for a pioneering backend developer to engineer the intelligence engine of our spatial workflows. This role owns the application-layer execution, state machines, and background runtimes that convert simple user intent or live streaming data thresholds into proactive, automated workflows and operations.   Responsibilities   Architect multi-step autonomous AI execution paths, context assembly modules, and chatbot routing engines. Implement reliable memory systems, state-tracking loops, and proactive alerting pipelines. Consume the streaming layers and data context provided via MCP servers by the Data Engineering team to wire up secure application logic. Integrate automated cross-platform notification pipelines (Slack, webhooks, alerting protocols) triggered directly by autonomous decisions. Requirements for the role Agentic Workflow & Productivity Edge:Mandatory Expertise: Deep, practical experience building production-grade autonomous loops, ReAct patterns, and multi-agent state architectures (e.g., LangGraph, AutoGen, or custom async graph structures). The candidate must naturally code within an AI-augmented environment to accelerate output, displaying elite productivity and immediate architectural autonomy.   Why join us?   Be part of the team pioneering Spatial Intelligence solutions at unprecedented scale—the breakthrough technology transforming how the world’s most prestigious airports, infrastructure operators, and smart cities understand and optimize physical flows.   As a 7-time Gartner-recognized category-defining leader with dozens of global awards including “Edge AI Product of the Year,” “LiDAR Leader Award,” “CES Best of Innovation” and many more, we’re backed by 37 patents and deployments with the most prestigious (and challenging) customers across four continents.   Join our international team of world-class experienced engineers and business leaders solving humanity’s most complex spatial challenges, from passenger flow optimization to autonomous robotics coordination, while working at the cutting edge of 3D AI, LiDAR perception, and real-time analytics.   Supported by rock-solid investors including BNP Paribas, BPI France, Energy Innovation Capital and Demeter who back our long-term vision, this is your opportunity to shape how physical and digital worlds interact, with the resources, growth trajectory, and technical challenges that will accelerate your career in ways traditional companies cannot offer.   Outsight is an Equal Employment Opportunity employer that pursues and hires a diverse workforce. Outsighters don't make employment decisions on the basis of race, color, religion, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age, military status, or any other basis protected by local, state, or federal laws. Outsight also strives for a healthy and safe workplace, and prohibits harassment of any kind. If you have a disability or special need that requires accommodation, please let us know.

Backend Engineer at Adaptive ml. Apply via Ashby.

Backend Engineer, Database at Adaptive ml. Apply via Ashby.

Founded in 2013, Voodoo is a tech company that creates mobile games and apps with a mission to entertain the world. Gathering 800 employees, 7 billion downloads, and over 200 million active users, Voodoo is the #3 mobile publisher worldwide in terms of downloads after Google and Meta. Our portfolio includes chart-topping games like Mob Control and Block Jam, alongside popular apps such as BeReal and Wizz. Team Blitz is a gaming platform launched in 2021, allowing players to compete on mobile games for real cash prizes (head-up, tournaments, leagues, etc.). It is leveraging a unique game portfolio to engage users in a fun and rewarding way. We are looking for a talented Senior Backend Engineer (Python) who will play a key role in the development of Blitz, our real-money gaming platform. Role

We're a product-first team on a mission to build the cybersecurity culture of every company in the world. Riot started with chat-based cybersecurity training employees actually engage with. Then phishing simulations to train them against real attacks. After sending millions, we knew the attacker's playbook — so we built Slash to catch what attackers send for real. Today, Riot is the employee security company, with products that cover every angle of how employees interact with security: Awareness — chat-based cybersecurity courses employees genuinely engage with, plus Studio, which lets security teams build their own custom training in minutes. Simulation — realistic phishing and smishing campaigns that train employees in a safe environment. Inbox — the AI-powered 24/7 cyber hotline for your security team. Employees report suspicious emails and ask IT/Security questions, Albert classifies and prioritizes them, and your team responds — fast. Sonar — DLP for Google Drive and OneDrive that stops data leaks before they happen. Sonar audits sharing configurations, gives employees clear guidance on what's safe to share with which partners, and delegates everyday decisions to your team while you keep control. Slash — email security that catches the attacks your filter misses. Albert alerts employees inside suspicious emails before they click, combines semantic and technical signals to spot sophisticated threats, and instantly removes confirmed threats from every inbox in the company. Created in 2020, Riot has raised $45m from top-tier investors (Y Combinator, Base10, Funders Club, Frst Capital), and now protects more than 2,000,000 employees in over 2,000 companies — including Intercom, Deel, Deezer, L'Occitane, Lovable, and Veolia — around the world. Cybersecurity is everywhere. It impacts everyone, every day, and it's the number one risk to any organization. Yet the cybersecurity posture in most companies is still a disaster, and hackers are exploiting it by targeting the weakest link: employees. We're on a mission to fix that — at scale.