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:

• 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

1. Fill out application
2. We screen your application
3. Jump on a intro call with our CTO
4. Technical Deep Dive interview
5. Super Day ( half or full day in Berlin Office )
6. Meet the other founders (short calls)
7. Decision & Offer