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Senior Fullstack Entwickler Java / Angular (m/w/d)

Rockstardevelopers GmbH
Contract type
Ongoing
Work mode
Hybrid · Mannheim, Germany · Stuttgart, Germany · München, Germany
Experience
Senior · Not stated

Level inferred from job title

Job description

Senior fullstack developer working embedded in client projects for large enterprises and public-sector clients, with a backend focus on Java and Spring Boot and a frontend focus on Angular.

At a glance

Employment
Full-time · Employee (employment agreement)
Work mode
Hybrid · Mannheim, Germany · Stuttgart, Germany · München, Germany
Languages
German

What you'll do

  • Work in client projects at large companies and public-sector clients, embedded in their teams.
  • Fullstack development in enterprise and regulated environments.
  • Help shape architecture, not just implement it.
  • Generate, review and refactor code with Claude Code, Copilot or Cursor.
  • Do code reviews and technical mentoring in the team.
  • Coordinate with Product Owners, UX and DevOps.

What we're looking for

  • Senior level; clients need people who deliver from day one and work independently.
  • Java (17+) and Spring Boot (microservices, domain-driven design).
  • REST interfaces and relational databases, especially PostgreSQL.
  • Docker and Kubernetes.
  • Test-driven development (TDD) with JUnit; tests are part of the definition of done.
  • Apache Kafka / asynchronous communication.
  • CI/CD (Jenkins, GitHub Actions), Git, agile working.
  • Angular with TypeScript.
  • Must be able to work productively with AI tools such as Claude Code, Copilot and Cursor.
  • Confident on both backend and frontend and able to get into new stacks quickly.

Nice to have

  • LLM integration in business applications (RAG, tool calling/MCP, agents), ideally with a project example.
  • Kotlin, Camunda (BPMN process automation).
  • AWS or Azure, JPA/Hibernate.
  • Monitoring (Grafana, Prometheus), frontend testing (Jest, Playwright, Cypress).
  • Accessibility (BITV 2.0 / WCAG AA), DevSecOps / security by design (public sector).
  • Experience in one of the client environments (large corporations, public sector) is a strong plus.

Benefits

  • Choose home office, office or a mix.
  • MacBook (unless the client provides its own hardware).
  • Various clients, various projects.
  • The founders are your direct contacts.
  • Internal upskilling in AI development.

How to get hired

  1. 1A CV is enough; no cover letter needed.
  2. 2After a short video question round (2×90 seconds) they get back within a few days.

Apply

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About Rockstardevelopers GmbH

Software developer with experience from hundreds of individual projects for enterprise and mid-sized clients.

Founded in 2015 in Mannheim, with further offices in Stuttgart and Munich; builds custom software for enterprise and mid-sized clients.

Key facts

  • 2015
  • Mannheim, Germany
  • Short paths, honest feedback, no political games.
  • No hierarchy levels between you and the people making decisions.
  • Clients staff these projects almost exclusively with permanent employees, so the role is permanent.

Partners & customers

Deutsche Bahn / DB SystelBundesagentur für ArbeitITZBundBundesdruckerei

What they value

  • Short paths, honest feedback, no political games.