Langfuse is building open-source observability and product analytics for LLM applications. We help engineers and companies understand how customers use their LLM applications and how they can improve on them. Have a look at our website and especially technical docs to learn more.

In Short: We're looking for an experienced product engineer to ship category defining LLM engineering products.

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

Links

• Our codebase: GitHub Repository
• Ben Kuhn on Impact, Agency and Taste
• Who we are & how we work
• What is a Product Engineer (PostHog)

https://github.com/langfuse/langfuse/

Stack: Frontend and Backend in Typescript (T3 Stack including NextJs, Tailwind, Prisma, tRPC), Postgres, Client facing SDKs in Python and Typescript