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

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