Java Backend Developer – Spring Boot, Camunda

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🔥 13 hours ago

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RockstarDevelopers GmbH

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2013

💼 Consulting

📣 Marketing

📦 Logistics

Consulting • Marketing • Logistics

RockstarDevelopers GmbH is a German software engineering and consulting firm that builds enterprise‑grade web, AI and Web3 solutions for large B2B clients. They provide end‑to‑end services including frontend, full‑stack and mobile development, AI application development (OpenAI Enterprise, LangChain, vector DBs), Web3 projects, and technical consulting around architecture, microservices, migrations and process optimization. The company focuses on digital transformation and modernization for enterprise customers, partnering with well‑known brands to deliver scalable, production‑ready systems and strategic digital roadmaps.

📋 Description

• Work on client projects for large companies and public-sector clients, embedded in their teams and taking full responsibility for your area • Design, develop, and test Java-based microservices • Develop synchronous and asynchronous REST and SOAP APIs and specify them with OpenAPI 3 • Implement process automation using Camunda BPM • Automate tests with JUnit 5 and Cucumber • Deploy your services, monitor them, and analyze issues • Contribute to the architecture • Generate, review, and refactor code using AI tools such as Claude Code, Copilot, or Cursor • Coordinate with integration partners across team boundaries • Partially support developed services in production, including scheduled on-call rotations

🎯 Requirements

• Senior level; deliver from day one and work independently • Java and Spring Boot, including Spring Data and Hibernate/JPA • Designing, developing, and testing microservices • REST and SOAP web services with JSON/XML over HTTP and OpenAPI 3 • PostgreSQL and Oracle • JUnit 5 and Cucumber • Docker and Kubernetes • CI/CD with GitLab Pipelines and builds with Maven • Git, Jira, Confluence, and agile working • Camunda BPM experience from real projects • OAuth 2.0 and Keycloak for authentication and authorization • German at native level or C1/C2 proficiency • Fluent in English • Daily coordination with business stakeholders and integration partners • Productive use of Claude Code, Copilot, or Cursor; AI tools are mandatory • Advantageous but not required: Apache Kafka and asynchronous communication • Advantageous but not required: XML, XSD, XSLT • Advantageous but not required: experience in complex projects with multiple teams involved • Advantageous but not required: legacy J2EE systems and their migration to Spring Boot

🏖️ Benefits

• Home office, office, or hybrid—your choice • MacBook provided (unless the client supplies their own hardware) • Varied clients and projects • The founders are your direct contacts • Internal upskilling in AI development • Scheduled on-call duty is organized and shared within the team