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. 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 Links Our codebase: GitHub Repository Ben Kuhn on Impact, Agency and Taste Who we are & how we work