Senior Product Engineer (Integrations)

Stack

Responsibilities

• ▹Build and maintain framework integrations (OpenAI SDK, Vercel AI SDK, LangChain, LlamaIndex, Pydantic AI, CrewAI, Amazon Bedrock AgentCore, LiveKit, and more)
• ▹Design new integration patterns for emerging frameworks (callback handler, decorator, OTEL auto-instrumentation)
• ▹Contribute to the core Python and TypeScript SDKs when integration work requires it
• ▹Write documentation and integration guides (quickstart tutorials, cookbooks, migration paths)
• ▹Be an active voice in the developer community: respond to GitHub issues, write blog posts, build relationships with framework maintainers

Requirements

• ▹Real experience building applications with frameworks like LangChain, Pydantic AI, Vercel AI SDK, LlamaIndex, or similar — or a strong willingness to go deep on the ecosystem
• ▹Strong in Python and/or TypeScript, writing clean and reliable code
• ▹Product-minded: obsessed with the developer's getting-started experience, error messages, and docs
• ▹Self-directed and motivated — investigates frameworks and proposes the right approach rather than waiting for detailed specs
• ▹CS or quantitative degree preferred, but not required

Nice to have

• ▹Experience with OpenTelemetry internals or observability instrumentation
• ▹Contributions to popular open source projects, SDKs, or developer tools
• ▹Experience building developer tooling, CLIs, or client libraries
• ▹Former founder or early startup experience
• ▹Active presence in AI/ML developer communities (blog posts, talks, open source)

Soft skills

What we offer

• ▹Full process to offer letter in under 7 days
• ▹Everything you build is open source and immediately visible
• ▹Small, accountable team where your output is visible and matters
• ▹One week per month in the Berlin office (EU-timezone role)

About the company

Langfuse is an open source LLM engineering platform that helps teams build useful AI applications via tracing, evaluation, and prompt management. Now part of ClickHouse (joined January 2026). The largest open source solution in its category: trusted by 19 of the Fortune 50, 2,000+ customers, 26M+ monthly SDK downloads. A small, engineering-heavy team based in Berlin and San Francisco.