Backend Developer Jobs in North Rhine-Westphalia, Germany

Backend Engineering at Bjak builds the core systems behind the AI Neobank app. The role designs and implements reliable APIs, workflows and financial product infrastructure that scale across markets and millions of users, collaborating with product, frontend, mobile and AI teams.

Turnblock.io backend team builds modular services for a tokenization platform. The Backend Developer (NodeJS) designs, implements, and maintains NodeJS/Express APIs, integrates third‑party RESTful services, and collaborates with frontend and blockchain engineers to deliver scalable products.

Backend Developer Java at Custom Software Solutions, part of Sopra Steria's #OneTeams, develops tailored software solutions for modernization, agile transformation, and smart collaboration. You focus on backend development with Java, analyze and optimize challenging applications, advise customers at eye level, and apply AI tools to support innovative, sustainable client solutions.

Sopra Steria, a leading European management and technology consultancy, seeks an AI Backend Developer to build robust backend components for data-intensive AI applications. Day-to-day work includes designing API architectures, integrating AI models, optimizing graph database solutions (e.g., Neo4j), and developing data and analysis workflows.

As a Kotlin Backend Developer at Devoteam, you will work within an agile team focused on API-first applications, managing the entire software lifecycle from requirements engineering through implementation to Go-Live and support. You will design scalable and resilient backend architectures based on REST with a focus on high availability and performance, translate business requirements into technical solutions, and integrate and model databases while driving the automation of operational backend p

As a Kotlin Backend Developer at Devoteam, you will work within an agile team focused on API-first applications, managing the entire software lifecycle from requirements engineering through implementation to Go-Live and support. You will design scalable and resilient backend architectures based on REST with a focus on high availability and performance, translate business requirements into technical solutions, and integrate and model databases while driving the automation of operational backend p

Development team at Hootsuite builds and maintains the core backend platform that powers the SaaS social media management product. The role designs and implements infrastructure services, automation tools, and platform features while supporting developer experience and production environments.

Optiplay is hiring a Middle+/Senior Backend Developer to design and maintain external integrations with casino operators and partner platforms, with about 70% of the role focused on integration work and 30% on general backend and platform system design. Day-to-day work includes building resilient integration layers, contributing to core services and APIs, participating in slot game logic development, defining integration testing practices, and collaborating with Game Logic, Product, and DevOps t

As a Senior Backend Developer (m/f/d) C# | Java at BEUMER Group in Beckum, North Rhine-Westphalia, Germany, you combine hands-on software development with technical leadership to drive innovative intralogistics software solutions. Day-to-day, you break down system designs, lead feature development, drive quality through architecture and peer reviews, estimate and prototype new ideas, mentor colleagues, and evaluate AI tools and agent frameworks to enhance engineering workflows.

Technology Projects team at GRAS Global Risk Assessment Services builds sustainable cloud platforms and backend services. The Senior DevOps Engineer will co‑own AWS/GCP infrastructure, design CI/CD pipelines, manage Docker containers, and develop Python APIs for geospatial data processing.

R&D Team at Outdooractive develops the technical foundation of the Outdooractive platform, ensuring performance, scalability and stability. The Backend Developer designs, implements and maintains Java EE web applications, conducts code reviews, automates tests and optimizes server infrastructure for API partners.

Backend Team at Genki builds the core system powering its health insurance platform for long‑term travelers. The role designs and implements new Kotlin features, improves testability and reliability, and evolves the event‑sourced architecture while collaborating with the Lead Backend Developer.

Secure Software Engineering research department at Fraunhofer SIT develops innovative security analysis tools. The student assistant will extend the backend of these tools using Java, implementing new vulnerability scanner functionalities within an agile development process.

Sopra Steria's Custom Software Solutions team seeks a Backend Developer with an AI focus to design and optimize custom software for clients across Germany. The role involves integrating AI applications into existing systems using Python and Java while advising customers on technical solutions.

Engineering Team at payabl. builds scalable, high‑performance backend services for fintech and payments platforms. The Senior Backend Python Developer designs and implements Python microservices, integrates third‑party APIs, and drives performance improvements using AWS, Docker, and CI/CD pipelines.

ARHS Group client team in Luxembourg builds mission‑critical backend systems for European institutional customers. The Senior Java Backend Developer / Technical Lead designs, develops, and maintains Java/Spring Boot services, leads technical design, mentors developers, and ensures secure, scalable delivery.

Secure Software Engineering research department at Fraunhofer SIT builds modern fuzzing infrastructure to detect software vulnerabilities. As a Student Assistant you will run existing fuzzers on popular x86 applications, extend them with cutting‑edge techniques, and maintain an exploit database.

You join the IT department of BarmeniaGothaerAG and report to Greta Benesch, supporting the Produktlinie Beratung & TAA. You develop modern applications and software components with a focus on Java and Backend technologies, continuously advancing existing applications and their technical modernization. You take technical responsibility for applications and components across their entire lifecycle, ensuring stable, maintainable, and well-tested software solutions while supporting your team with t

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EarthLab Luxembourg (https://www.earthlab.lu/) is an innovative company at the intersection of Earth observation and artificial intelligence. Our proprietary Max-ICS platform facilitates seamless Earth Observation (EO) data integration, advanced EO data processing, and continuous AI model training and orchestration, bridging the gap between raw satellite data and actionable insights.