Senior Fullstack Engineer - Custom Solutions

You'll join a newly formed team at Staffbase that builds custom solutions — extending the functionality and capabilities of the award-winning employee communications platform to meet real customer needs. You'll own solutions from beginning to end: shaping use cases together with stakeholders, building them across the stack, and validating them with the people who use them. You'll also help bring structure to a growing team of mid-level engineers and mentor them along the way.

What you'll do

• Own the development of custom solutions end-to-end — from technical design through implementation, testing, and release
• Partner with stakeholders (customers, consultants, and internal teams) to define and detail use cases before development, then validate solutions and gather feedback afterward
• Build across the stack: customer-facing UI in React and TypeScript, backend services, and integrations with Staffbase and third-party APIs
• Mentor mid-level engineers and help bring structure, engineering standards, and good practices to a newly formed team
• Work in a cross-functional, agile setup and produce high-quality, well-tested code
• Work iteratively — pushing code frequently, keeping a healthy CI/CD pipeline, and automating where it helps

What you'll need

• Solid professional experience (typically 5+ years) as a fullstack developer, including working within engineering teams and owning solutions from concept to delivery
• Strong frontend skills with React.js, TypeScript, and JavaScript, paired with solid backend experience (e.g. Kotlin, Java, or Node.js)
• Confidence working with REST APIs and SDKs, and integrating with external systems
• Experience mentoring or guiding less-experienced developers, and a knack for bringing structure to how a team works
• Comfort working directly with stakeholders — you can translate business needs into technical solutions and validate them afterward
• A strong focus on quality, clean code, testing, and continuous learning
• Fluent written and spoken English and German

Nice to have

• Experience with Go, MongoDB, Docker, Kubernetes, GitHub Actions, Terraform, Prometheus or Grafana
• A background in professional services, consulting, or building custom, customer-facing solutions
• Enterprise integration concepts such as SSO, SAML, OIDC, or SCIM

What they offer

• Competitive compensation including LTIP (unit-based Long Term Incentive Plan)
• Flexible working time models and hybrid work option with yearly flex work allowance of €1,560
• 31 vacation days annually plus pro rata fully paid Fridays off during August
• Company pension scheme
• One volunteer day per year for supporting a social project