Senior Fullstack Developer, m/f/d

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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 at large companies and public-sector clients, embedded in their teams • Take full responsibility for your own area • Fullstack development in enterprise and regulated environments • Help shape architecture • Generate, review and refactor code using Claude Code, Copilot or Cursor • Conduct code reviews and provide technical mentoring within the team • Coordinate with Product Owners, UX and DevOps • Depending on the project and your experience, contribute to different client environments and industries

🎯 Requirements

• Senior level; deliver from day one and work independently • Strong backend core in Java (17+) and Spring Boot, or solid knowledge of .NET, Kotlin or Python • Experience with REST APIs • Knowledge of relational databases such as PostgreSQL, MariaDB or Oracle • Experience with Docker and Kubernetes • Experience with CI/CD, especially Jenkins or GitHub Actions • Proficient with Git and agile ways of working • Confident with React/Next.js or Angular, each with TypeScript; knowledge of both frontend technologies is a plus • Experience with AWS or Azure • Confident in fullstack development and able to ramp up quickly in new stacks • Productive use of AI tools such as Claude Code, Copilot or Cursor is required • Experience in enterprise, regulated, public-sector or medium-sized company environments is an advantage • Knowledge of Apache Kafka/asynchronous communication, microservices, Domain-Driven Design, JPA/Hibernate, monitoring with Grafana/Prometheus, object storage with S3, testing with JUnit/Jest/Playwright/Cypress as well as BITV 2.0/WCAG AA and DevSecOps/Security by Design is a plus

🏖️ Benefits

• Remote, office or hybrid — you decide • MacBook (unless the client provides their own hardware) • Variety of clients and projects • The founders are your direct contacts • Internal upskilling in AI development • No hierarchical layers between you and the decision-makers • Honest feedback • No political games