Backend Developer Jobs in Lower Saxony, 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.

We are seeking a Backend Developer to join our engineering team in Hamburg, Germany. The role focuses on designing, implementing, testing, commissioning, and maintaining high-performance backend systems for a mobile advertising platform.

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.

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.

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.

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.

ML team at Mindpeak, a Hamburg-based AI-driven cancer diagnostics scale‑up, builds the software that powers medical AI models from data pipelines to UI. The role designs robust backend services, containerized image‑processing systems, and workflow automation, while also extending frontend components for model management. On-site in Hamburg, full‑time, with a focus on integrating AI into production environments.

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.

Gemeinsam mit einem Entwicklungsteam von maximal zehn Personen kannst du deine Ideen einbringen und aktiv an Lösungen mitwirken. In regelmäßigen Austauschrunden erhältst du individuelle Unterstützung bei Fragestellungen und förderst dabei sowohl deine persönliche Entwicklung als auch die des Teams.

Du entwickelst Softwarelösungen, insbesondere mit Python und Java, und bringst gerne deine eigenen Ideen aktiv ein In Kundenprojekten integrierst du eigenständig AI-Anwendungen in bestehende Systeme Die Analyse und Optimierung anspruchsvoller Applikationen werden von dir analysiert und kontinuierlich optimiert Gemeinsam mit deinem Team gestaltest du innovative Anwendungen Als kompetente Ansprechperson berätst du unsere Kunden auf Augenhöhe und gestaltest die Projekte mit Du entwickelst dich in d

Nebius, a leading AI cloud infrastructure provider, seeks a Senior Backend Engineer to build fault‑tolerant services on its hyperscaling platform. The role focuses on Golang, with exposure to Java and Python, and involves designing cloud infrastructure, managed databases, Kubernetes, billing, monitoring, and ML services.

Engineering team at exmox builds high‑scale backend systems for a rewarded user engagement platform. The Senior Backend Engineer designs and implements APIs, event‑driven architectures, and containerized deployments while mentoring engineers and collaborating with product and data teams.

Purchasing Interface Team builds the core systems for buying, procurement, private label and fotostudio operations. As a Backend Engineer you will develop high‑traffic web applications with PHP/Laravel, design and scale RESTful APIs and background jobs, and own feature delivery from code commit to production monitoring.

BBHT Consulting team builds modern Java enterprise solutions for clients. As a Java Backend Engineer you design, develop and deploy client‑server applications using Spring, Spring Boot and RESTful APIs, collaborate with project managers, analysts and other developers, and mentor junior colleagues.

Grafana Alerting squad builds the core alerting platform for Grafana Cloud and on‑premise deployments, enabling users to manage and scale alerts across diverse environments. The Staff Backend Engineer will design, build, and operate distributed systems for alert ingestion, evaluation, and delivery, mentor teammates, and contribute to open‑source initiatives.

ZEAL Network SE is Germany’s largest online lottery provider, operating brands like LOTTO24 and Tipp24, and shaping the future of lottery and e-commerce experiences. As Engineering Team Lead (Backend) in Hamburg, you combine hands-on technical expertise with strong people leadership to grow a high-performing team.