Product Engineer

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

• Do whatever it takes to build new features for our users. For this you are not afraid to touch FE, BE, SDKs or Docs
• You love to communicate with users on a call or in one of our hundreds of slack channels
• You will come up with a plan on how to build the next big feature at Langfuse and execute on it
• 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

• Someone who is able to PM and project manage themselves
• 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)

1. Fill out application & We screen your application
2. Call: Intro & CV deep dive with CTO (45min)
3. Call 2: Technical Deep Dive (90min)
4. Onsite Super Day ( half or full day in Berlin Office )
5. Meet the other founders (short calls)
6. Decision & Offer

We expect you to have used Langfuse (you can sign up for a free account here) and skimmed through our documentation and public content.