Do you want to design scalable backend systems and build powerful APIs that drive modern digital platforms? Then you’re the perfect fit for our team – working with German corporate clients and global B2B market leaders!

What we offer

- The chance to become part of a large, international agency group: approx. 350 great employees in Germany, a modern, customer‑centric business model and a true New Work environment. As part of MSQ with a further 1500 colleagues, we offer an international perspective with offices and sister agencies in the UK, USA and Asia
- Adaptable 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
- And of course: modern hardware, well‑equipped tool landscape, company pension scheme, further training budget, in‑house training, company events, drinks flat rate and good coffee

What you do

- 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

What you bring along

- 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

#J-18808-Ljbffr

📌 Senior Backend Developer (all genders) (Barcelona)
🏢 United Digital Group
📍 Barcelona