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Langfuse is building open source dev tooling for LLM apps based on observability/tracing. We have significant traction and are growing fast. We are looking for a platform engineer to help us scale our product. We work on-site from 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 looking for a platform engineer to join our team in-person in Berlin, Germany.

Your main responsibility will be to ensure that the Langfuse platform scales. 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 Steffen who ensure the uptime and resilience of Langfuse.

Projects you will be involved in include:

• Optimizing the latency of complex database queries in Postgres or Clickhouse
• Helping our customers deploy Langfuse in self-hosted environments, e.g., by updating our k8s helm chart
• Adding Redis queues and a worker container to our stack to execute async tasks
• Building a POC to try out Clickhouse for our needs
• Rebuilding our SDKs to execute networking fully asynchronously
• Writing Terraform code to scale Langfuse containers according to custom metrics

Stack: Frontend and Backend in Typescript (including Express, NextJs, Tailwind, Prisma, tRPC), Clickhouse, Postgres, Redis, S3, Client-facing SDKs in Python and Typescript. Familiarity with a majority of these technologies is preferred, but we trust you can pick up new languages/frameworks quickly. Please have a look at our repo to see our architectural choices.

Join a pure-play open source devtool company in Berlin, Germany.

You are joining 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 will 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 choose to.

This is the perfect role for an experienced engineer who wants to join an early-stage company and build it into the leading open source LLMOps platform.

• You are a hard worker and thrive in a small, accountable team
• You want to take ownership in building out the infrastructure of a fast-growing devtool
• You have been a core maintainer of a highly reliable and scalable infrastructure
• You are excited about open source software and want to engage with our users to understand their needs
• You have 3+ years of experience in backend or full-stack development and understand the trade-offs of handling large amounts of data - a CS/quantitative degree is preferred
• You have impressive achievements from previous careers and side projects — we’re excited to hear about these!

Bonus Points

• You’ve started a company before or worked at a very early-stage startup
• Experience with or interest in SDK design and developer experience (DX)
• ML/AI experience

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 team (Marlies, Hassieb, Steffen and Jannik).

We work in-person from our office in the heart of Berlin-Mitte. You must be willing to be located in Berlin. We aim for 4-5 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 autonomy.

A few tidbits that might help you understand what kind of company we are:

• We plan on only hiring engineers for the foreseeable future
• You can expect to have ~1 meeting a day on average
• Reed Hastings’ ‘No Rules Rules’ inspires our culture, here’s a summary
• We’re big fans of Y Combinator and follow its ethos. We’re a Silicon Valley Startup in Berlin - more here
  • we brought out the entire team to San Francisco for two weeks this year, we’d love to do this again!

Salary: 70,000 - 130,000 EUR

Equity: 0.1% - 0.35% Equity