Senior/Staff Fullstack Engineer (m/f/x)
On-siteBerlin, State of Berlin, Germany
Berlin, State of Berlin, GermanyOn-siteFull TimeSenior LevelStartup
Full TimeSenior LevelStartup
Job Summary
Build interfaces for auditors, improve core AI agents, and ensure long-running workflows are reliable and debuggable. Partner with design to streamline complex flows, drive RFCs and technical discussions, and leverage AI tools to accelerate your own development. Own architecture decisions and ship first versions of solutions where no reference implementation exists. Work in a small, flat engineering team in Berlin, making architectural trade-offs and building products auditors rely on daily.
Required Qualifications
- 5+ years shipping production web applications across the stack
- Write production APIs and model the data behind them so it holds up under multi-tenancy and load
- Are strong on the frontend and can build genuinely complex UI
- Get how LLM agents actually work: agents, harnesses, tool use, and measuring quality with evals
- Keep up with where AI is moving and bring the latest tools into how you work to make yourself faster
- Bring a strong product mindset and real ownership of outcomes
- Make architectural decisions, weigh trade-offs, and build things other engineers can extend
- Are comfortable with ambiguity and work things out from fundamentals when there's no established answer
Desired Qualifications
- Hands-on experience building agents, harnesses, or eval pipelines
- Data-dense or workflow-heavy B2B products
- Scaling multi-tenant systems as data and traffic grow
- Audit, finance, compliance, or another domain where being wrong is expensive
- Early-stage startup or fast-moving engineering environment
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