Frontend Engineer
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:
* Building complex data visualization components for billions of LLM traces
* Optimizing bundle sizes and implementing code splitting for faster load times
* Creating performant table components that handle millions of rows of data
* Building real-time dashboards with WebSocket connections
* Implementing advanced filtering and search interfaces for complex datasets
* Writing comprehensive frontend tests and setting up CI/CD pipelines
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)
* Clickhouse, Postgres, Redis, S3
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