(Senior) Frontend Engineer
About Langfuse
Open Source LLM Engineering Platform that helps teams build useful AI applications via tracing, evaluation, and prompt management (mission, product)
We have the chance to build the "Datadog" of this category; model capabilities continue to improve but building useful applications is really hard, both in startups and enterprises
Largest open source solution in this category: >2k customers, >14M monthly SDK downloads, >6M docker pulls
We raised money from world class investors (Y-Combinator, Lightspeed, General Catalyst) and are default alive by making more money than we spend
We're a small, engineering-heavy, and experienced team in Berlin and San Francisco (how we work)
About the Role
In short: We're hiring a Frontend Engineer to build performant, scalable user interfaces for our rapidly growing LLM engineering platform.
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. See full stack here.
React
Frontend and Backend in Typescript (including Express, NextJs, Tailwind, Prisma, tRPC)
What we're looking for
3+ years of experience in frontend development
Experience building highly performant front-ends.
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
Hiring Process
We can run this process in less than 7 days.
Fill out application
We screen your application
Jump on a intro call with our CTO
Technical Deep Dive interview
Super Day ( half or full day in Berlin Office )
Meet the other founders (short calls)
Decision & Offer
