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Senior Fullstack Engineer

Staffbase - Berlin, Berlin, Germany - Hybrid - posted 2026-10-06

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Staffbase is an AI-native Employee Experience Platform serving 1,500+ customers and 14+ million employees globally. The company is a unicorn (valued at $1B+) with 550+ employees across offices in Chemnitz, New York, Berlin, London, Sydney, Tokyo, Prague, and Minneapolis–St. Paul. You'll join a newly formed team building custom solutions that extend the Staffbase platform for enterprise customers. This role combines full-stack development ownership with technical leadership of a growing team. You'll own solutions end-to-end: shaping use cases with stakeholders, building across the stack, testing, and validating with users. You'll also mentor mid-level engineers and help establish engineering standards and processes for the new team. Key responsibilities: - Own custom solution development from technical design through implementation, testing, and release - Partner with customers, consultants, and internal teams to define use cases and validate solutions - Build customer-facing UI in React and TypeScript, backend services, and third-party integrations - Mentor mid-level engineers and bring structure to team processes and engineering standards - Work in cross-functional, agile teams producing high-quality, well-tested code - Participate in code reviews, share knowledge, and continuously learn - Push code frequently, maintain healthy CI/CD pipelines, and automate where beneficial Tech stack includes: React.js, TypeScript, JavaScript, Node.js, Kotlin, Go, Java, MongoDB, REST APIs & SDKs, Docker, Terraform, Selenium, and Cypress. The environment emphasizes diversity, inclusivity, flexible work arrangements, work-life balance, and a "you build it, you run it" ownership culture. REQUIREMENTS: - 5+ years professional experience as a fullstack developer, including team-based work and owning solutions from concept to delivery - Strong frontend skills: React.js, TypeScript, JavaScript - Solid backend experience: Kotlin, Java, or Node.js - Confidence with REST APIs, SDKs, and external system integrations - Experience mentoring or guiding less-experienced developers and bringing structure to team workflows - Ability to work directly with stakeholders, translating business needs into technical solutions - Strong focus on quality, clean code, testing, and continuous learning - Fluent written and spoken English and German (both required for stakeholder and customer collaboration) - Self-starter who works well independently and as part of a team - Appreciation for diversity and inclusivity in the workplace NICE TO HAVE: - Experience with Go, MongoDB, Docker, Kubernetes, GitHub Actions, Terraform, Prometheus, or Grafana - Background in professional services, consulting, or building custom customer-facing solutions - Knowledge of enterprise integration concepts (SSO, SAML, OIDC, SCIM) - Understanding of REST and microservices architecture

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