Product Engineer

Langfuse (Headquarters: Berlin, Germany)

LLMOps Open Source Observability Evaluations Prompt Management Testing Developer Tools AI Berlin In-person Full-stack UI Backend SDKs Integrations TypeScript Python React AI Engineer Full Stack Engineer Product

Langfuse (YC W23) is building the leading open-source LLM engineering platform (GitHub: https://github.com/langfuse/langfuse/). We provide LLMOps tooling including observability, evaluations, prompt management, and more, helping sophisticated development teams build better AI applications. We are a Y Combinator-backed company (Seed: $4M from Lightspeed, General Catalyst) based in Berlin, working in-person (4-5 days/week). We value quality engineering, elegant solutions, shipping in open source, and working with interesting developer customers. Our culture is high-trust, inspired by 'No Rules Rules', with minimal meetings and a focus on impact.

As a Product Engineer, you will design, scope, ship, and launch new full-stack features (UI, backend, SDKs, integrations) on top of our existing data platform. You'll take true end-to-end ownership, from initial user conversations to operating features in production. You will work closely with our users (developers) to understand their needs and build features that enhance their LLM engineering workflow. Examples of work include features launched during our launch weeks (see #1, #2 on careers page). We seek engineers passionate about building great developer experiences, comfortable working across the stack (TypeScript, Python, React), and eager to ship impactful features in an open-source context.