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 hiring a design engineer (design-minded front-end engineer) to help us elevate our user’s experience.

What you'll do

• Own UX and interfaces at Langfuse

• Collaborate closely with our product engineers

• Make our data-dense application easy to use

• Make Langfuse the best developer focused UI out there

• Simplify complex user flows

• Create reusable, consistent UI elements

Past projects

You might have worked on:

• Redesign our filters for our table components to allow users to apply filters with ease

• Implement data heavy and complex setups for features like prompt experiments

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 front-end / full-stack engineering and a penchant for design

• Take ownership of our frontend and UI/UX made for developers

• You want to talk to users

• Hard worker and thrive working in a small and accountable team

• Good understanding of best in class UI/UX

• Excited about open source software

Bonus

• 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