Senior Backend Developer (all genders)

United Digital Group; Barcelona; Híbrido; EUR 40.000 - 65.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Flexible working environment

Modern hardware

Company pension scheme

Further training budget

Work & life balance initiatives

Descripción de la vacante

A leading digital agency in Barcelona is seeking a skilled backend developer to design scalable systems and build powerful APIs leveraging Java and Spring Boot. The ideal candidate will have 5+ years in backend development, substantial experience with RESTful and GraphQL APIs, and hands-on skills in microservice architectures. The role offers a hybrid working environment with extensive support and development opportunities in an agile setup.

Formación

• 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.

Responsabilidades

• Design and develop scalable backend systems and services using Java and Spring Boot.
• Build and maintain REST and GraphQL APIs for modern applications.
• Design and implement microservice architectures focusing on scalability and maintainability.

Conocimientos

Java

Spring Boot

RESTful APIs

GraphQL APIs

Microservice architectures

Agile methodologies (Scrum/Kanban)

CI/CD pipelines

Version control (Git)

Software architecture

Descripción del empleo

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
• 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
• 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