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 design engineer / front-end savvy designer to help us elevate our user’s experience. 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 feel free to try the product (free) 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 design engineer to join our team in-person in Berlin, Germany.

What you will be working on

You will own User Experience and Interface at Langfuse, a devtool used by thousands of teams on a daily basis. We aim to make debugging, analyzing and improving LLM applications a breeze. You will own our user’s perspective and ensure our product flows in a way that makes our user’s lives easier and delights them.

You will be working closely with Marc (CEO) and Marlies who focus on Langfuse’s user-facing side.

Stack: Frontend Typescript (NextJs, Tailwind, shadcn, Magic UI), Clickhouse, Postgres) — you should be familiar with a majority of these but we trust that you can pick up any new frameworks 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 lie at the foundation of how we design our product. Choosing simple yet appropriate design and anticipating upcoming challenges is key.

You will contribute to a thriving commercial open source project and build in public. You will own much of the public-facing Langfuse user experience end-to-end and will be able to talk about and showcase your work freely.

Who We Are Looking For?

This is the perfect role for an experienced frontend engineer or a designer with good frontend skills who wants to join an early stage company and build it into the leading open source devtools in Europe.

You are a hard worker and thrive working in a small and accountable team
You want to take ownership and design UI-UX from the ground-up.
You are excited about open source software. You want to talk to our users to understand why they use us and how we can make our UI-UX support their workflows.
You have 3+ years of experience in design, front-end or full-stack engineering.
You have impressive achievements from previous careers and from side projects — we’re excited to hear about these - we’d love to see your previous (visual) work.

Bonus Points

You’ve started a company before or worked at a very early stage startup
Interest/experience in AI/ML

Team, Values & Benefits

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 lovely 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