Open source LLM engineering platform
Langfuse is building open source dev tooling for LLM apps based on observability/tracing. We have significant traction, are growing fast. We are looking for a full stack product engineer to help us build out our platform in Berlin, Germany.
Langfuse is building the open-source LLM engineering platform. We help engineers understand how users interact with their LLM applications and how they can improve them. Have a look at our website, our GitHub and especially our technical docs to learn more.
We have raised a $4m seed round from Y Combinator, Lightspeed and General Catalyst. Thousands of engineers use Langfuse to observe, debug and improve their LLM apps. We are now looking for a hands-on product engineer to join our team in-person in Berlin, Germany.
Your main responsibility will be to add new features and build out existing ones in Langfuse. At the core of Langfuse lies the ingestion of millions of events a day via our SDKs. Once the data is in our database, we visualize it in our UI and run async workflows on top of it in the background.
You will be working closely with Max (CTO) and Marc (CEO) who own tech and product respectively.
Projects we have worked on in the past that you would have been involved in:
Stack: Frontend and Backend in Typescript (T3 Stack including NextJs, Tailwind, Prisma, tRPC), Clickhouse, Postgres, 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. Please have a look at our repo to see our architectural choices.
You are joining Langfuse early. We will treat you as a core member of the team from day 1 and you will be incentivized as such. Your decisions and code lie at the foundation of our product. Choosing appropriate yet scalable technologies and anticipating upcoming challenges are key.
You will contribute to a thriving commercial open source project and build in public. You will own parts of the Langfuse product end-to-end. You may decide to take on manager responsibilities over time if you so choose.
This is the perfect role for an experienced engineer that wants to join an early stage company and build it into the leading open source LLMOps platform.
Bonus Points
You will join our early core team and work closely with the three founders of Langfuse: Max (CTO), Marc (CEO) and Clemens (COO) and our two engineers Marlies and Hassieb.
We work in-person from our lovely office in the heart of Berlin-Mitte. You must be willing to be located in Berlin. We aim for 3-5 days in the office a week.
Our team culture is built around performance and learning. We want to build a small team of highly motivated, independent and intelligent people. We will support and challenge you while granting you a high degree of autonomy.
A few tidbits that might help you understand what kind of company we are:
Intro Call - Intro, Logistics & Fit with a founder (30min)
Second Call - Get to know Product and Tech at Langfuse with a founder (40min)
Third Call - Technical Interview: Coding challenge and Systems Design (90min)
On-site Super Day (0.5-1 day)
Decision
We expect you to have used Langfuse (you can sign up for a free account here) and skimmed through our documentation and public content.
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.