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.

In short: We hiring a design engineer (design-minded front-end engineer) to help us elevate our user’s experience.

About Langfuse

• We help engineers and enterprises build and run LLM applications at scale.
• We are building the fastest growing open-source LLM engineering platform.
• 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

• Own UX and interfaces at Langfuse
• Collaborate closely with our product engineers
• Make our data-dense application easy to use
• Make Langfuse the best developer focused UI out there
• Simplify complex user flows
• Create reusable, consistent UI elements

Past projects

You might have worked on:

• Redesign our filters for our table components to allow users to apply filters with ease
• Implement data heavy and complex setups for features like prompt experiments

Tech Stack

You should be familiar with a majority of these but we trust that you can pick up a new language/framework quickly.

• React
• Frontend and Backend in Typescript (including Express, NextJs, Tailwind, Prisma, tRPC)

What we're looking for

• 3+ years of experience in front-end / full-stack engineering and a penchant for design
• Take ownership of our frontend and UI/UX made for developers
• You want to talk to users
• Hard worker and thrive working in a small and accountable team
• Good understanding of best in class UI/UX
• Excited about open source software

Bonus

• ML/AI experience
• Impressive achievements from previous careers or side projects
• Previous startup or founding experience

Why Langfuse?

• You are joining really early
• Strong Product Market Fit!
• We are building a very small but highly capable team
• Only hiring Engineering in foreseeable future
• Strong customer & revenue growth
• Building picks and shovels for the hottest AI companies
• Building for very sophisticated technical users
• Competitive salary & equity
• Performance and learning focused culture
• Everyone on the team says: "best place I've ever worked at"

How we work

• Engineering based in Berlin ( we aim for 4-5 days in the office )
• No more than 2 short scheduled meetings per week
• Extreme ownership & autonomy how and what to work on

Links

• Our codebase: GitHub Repository
• Ben Kuhn on Impact, Agency and Taste
• Who we are & how we work

https://github.com/langfuse/langfuse/

Stack: Frontend and Backend in Typescript (T3 Stack including NextJs, Tailwind, Prisma, tRPC), Postgres, Client facing SDKs in Python and Typescript