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.

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

Links

• Our codebase: GitHub Repository

• Ben Kuhn on Impact, Agency and Taste

• Who we are & how we work