Platform Engineer / SRE

TLDR; 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. About Langfuse 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. What you will be working on 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. Here, you can find a long, in-depth blog post about a large platform challenge we recently tackled. If this sounds like something you would enjoy — we should talk! Projects we have worked on in the past that you would have been involved in: Optimizing the latency of complex database queries in Postgres or Clickhouse Helping our customers deploy Langfuse in self-hosted, 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 Re-building our SDKs to execute networking fully asynchronous Write 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, — 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. The opportunity 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 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. Who We Are Looking For? 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. You are a hard worker and thrive working in a small and 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 scaling infrastructure You are excited about open source software. You want to talk to our users to understand why they use us and what they require. You have 3+ years of experience in backend or full-stack development and know the trade offs of handling large amounts of data- a CS/quantitative degree is preferred You have impressive achievements from previous careers and from side projects — we're excited to hear about these!

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.