Design and development of scalable backend systems and services using Java and Spring Boot
Building and maintaining REST and GraphQL APIs for modern web applications and digital platforms
Designing and implementing microservice architectures with a focus on scalability, resilience and maintainability
Integration of external systems, databases and third-party services
Ensuring high performance, security and reliability of backend services
Close collaboration with frontend developers, DevOps, UX/UI design and project management in agile environments (Scrum/Kanban)
Continuous improvement of code quality, architecture and development processes

5+ years of professional experience as a backend developer with Java and Spring Boot
Strong experience in designing and developing RESTful and/or GraphQL APIs
Hands-on experience with microservice architectures and distributed systems
Good understanding of software architecture, clean code principles and backend design patterns
Experience with CI/CD pipelines, version control (Git) and modern development workflows
Strong problem-solving skills, ownership mindset and team-oriented working style
Very good written and spoken German or English skills

Flexible working environment: Hybrid or in one of our beautiful offices in Mainz, Ludwigsburg or Barcelona
Agile organization: Self-organized teams, extensive onboarding, personal buddy and lots of support from experienced colleagues
Work & life balance: job bike leasing, Smart'n'fit weeks, fitness and self-care offers via EGYM Wellpass
modern hardware
well-equipped tool landscape
company pension scheme
further training budget
in-house training
company events
drinks flat rate
good coffee

Senior Backend Developer – all genders

Key skills