Backend Developer Jobs in Hesse, 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.

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.

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.

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

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

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.

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.

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.

Wir aus dem IT-Bereich Kundentechnologie sorgen mit Herzblut und Leidenschaft für eine optimale Performance unserer Prozesse, Systeme und Services über alle Verkaufskanäle hinweg. Sei dabei und werden Teil unseres Macher-Teams beim Gestalten und Ausbau unserer Webshop Plattformen.

Wir aus dem IT-Bereich Kundentechnologie sorgen mit Herzblut und Leidenschaft für eine optimale Performance unserer Prozesse, Systeme und Services über alle Verkaufskanäle hinweg. Sei dabei und werden Teil unseres Macher-Teams beim Gestalten und Ausbau unserer Webshop Plattformen.

Daran werden Sie wachsen: Entwicklung und Weiterentwicklung moderner Backend- und Cloud-Lösungen Konzeption skalierbarer Software- und Datenarchitekturen sowie technische Verantwortung für anspruchsvolle Kundenprojekte Integration moderner KI-Technologien und datengetriebener Funktionen in produktive Softwarelösungen Analyse fachlicher Anforderungen und Ableitung nachhaltiger technischer Lösungen gemeinsam mit Kunden und Fachbereichen Etablierung moderner DevOps-Praktiken sowie Begleitung des ge

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.

Relution Dev team builds modern UEM software to drive digitalization in schools. As a Backend Engineer you will develop and optimize backend services using Spring Boot and Java, design secure RESTful APIs with OAuth2/JWT, and create CI/CD pipelines while collaborating with interdisciplinary teams.