In short: We're hiring a Frontend Engineer to build performant, scalable user interfaces for our rapidly growing LLM engineering platform.
About Langfuse
We are building the fastest growing open-source LLM engineering platform.
We help engineers and enterprises build and run LLM applications at scale.
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 from Berlin, Germany.
What You'll Do
Past projects you would have led:
Come up with an improved architecture for our frontend application
Build self-serve dashboards to generate insights into billions of LLM executions of our users
Creating performant table components with a focus on usability and fast rendering times
Implementing advanced filtering and search interfaces for complex datasets
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, Shadcn, Prisma, tRPC)
What We're Looking For
3+ years of experience in frontend development
Experience building high-performance web applications that handle large datasets
Strong understanding of React, TypeScript, and modern frontend tooling
Experience with state management and data fetching patterns
Hard worker and thrive working in a small and accountable team
Excited about open source software
A CS/quantitative degree is preferred
Bonus
Performance optimization and profiling experience
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