In Short: We're looking for an experienced product engineer to help us scale our platform as we grow. About Langfuse We are building the fastest growing open-source LLM engineering platform. We help engineers and enterprises build and run LLM applications at scale. We've raised $4m from Y Combinator, Lightspeed and General Catalyst. Thousands of teams and engineers use Langfuse daily. Thousands are joining every month. We're a small, focused team working in-person from Berlin, Germany. What you'll do Owning products and features from beginning to end Work on our Python and TypeScript SDKs Ship new features in our Web Application Collaborating with design (when necessary) Talking to users ( mostly cracked devs ) Doing support Writing docs Tech Stack Frontend and Backend in Typescript (including Express, NextJs, Tailwind, Prisma, tRPC) Clickhouse, Postgres, Redis, S3 Client facing SDKs in Python and Typescript You should be familiar with a majority of these but we trust that you can pick up a new language/framework quickly. What we're looking for Experience building highly reliable, scaling infrastructure Interest in open source software and talking to users Hard worker who thrives in a small, accountable team CS or quantitative degree preferred Impressive achievements (professional or otherwise) Bonus points: Former founder Experience in SDK design DX, ML/AI background Why Langfuse? Building for very sophisticated technical users Competitive salary & equity compensation Strong customer & revenue growth You are still joining really early Strong in person engineering culture (Berlin-Mitte) Extreme autonomy Performance and learning focused culture Everyone on the team says: "best place I've ever worked at" 2 short scheduled meetings per week Process We can run this process to offer in less than 7 days. Fill out application We screen your application Jump on a intro call with our CTO Technical Deep Dive interview Super Day ( half or full day in Berlin Office ) Meet the other founders (short calls) Decision & Offer Links Project you could have built: Infrastructure Evolution Blog Post Our codebase: GitHub Repository Ben Kuhn on Impact, Agency and Taste Who we are & how we work What is a Product Engineer (PostHog)