Senior Product Engineer

About the Role

This is a fully end-to-end product engineering role at a well-funded, open-source LLM observability and engineering platform in the AI/ML space. You will own features from the first user conversation all the way through spec, code, documentation, and public changelog — no handoffs, no silos.

Recent examples of single-engineer scope include: an agent observability release, a TypeScript SDK rewrite on OpenTelemetry, and a hosted MCP server for prompt management. This is the level of ownership and impact you can expect.

What You'll Do

• Own features end-to-end — conduct user calls, write the spec, ship the code, write the docs, and publish the changelog post.
• Work the full stack — React frontend, Next.js backend, ClickHouse analytics, Python and TypeScript SDKs. Touch whatever the feature requires.
• Engage with the open-source community — participate in public code reviews, respond to GitHub issues, and contribute to community-visible codebases.
• Build and maintain SDKs and integrations — maintain client libraries across Python and TypeScript, and support a broad ecosystem of integrations.
• Instrument and monitor production systems — collect and analyze metrics such as latency, cost, and quality; build and improve tracing and observability tooling.
• Collaborate cross-functionally — work with product managers and designers using strong async-first communication.

What We're Looking For

Required:

• 5+ years of professional software engineering experience building production-grade systems
• Located in the EU with the legal right to work in the EU (visa sponsorship is not available)
• Able to be on-site in Berlin approximately one week per month
• Overlap with CET business hours for regular collaboration
• Hands-on experience building production-grade LLM applications or infrastructure (prompt management, evaluations, LLM tracing/observability)
• Experience contributing to and maintaining open-source projects and working in community-visible codebases
• Practical experience with containerization and deployment workflows (Docker) and distributing/maintaining SDKs or client libraries
• Experience with instrumentation and observability: collecting and analyzing metrics, building tracing/monitoring tools
• Proven track record of shipping end-to-end product features cross-functionally
• Strong written and async communication skills for public-facing code reviews, documentation, and community interaction

Nice to Have:

• Familiarity with columnar OLAP databases (e.g., ClickHouse) or similar scalable analytics stores

Compensation & Benefits

• Salary: $90,000 – $160,000 USD annually
• Equity participation
• Remote-first team with a collaborative in-person week in Berlin each month

Location

Fully remote within the EU (Germany, Austria, Switzerland, UK, Netherlands, France, Spain, Sweden, Poland, and similar). Must be based in the EU with existing right to work. Candidates should expect approximately one week per month on-site in Berlin. Visa sponsorship is not available.