Design Engineer at Langfuse (W23) €70K - €160K EUR Open source LLM engineering platform Berlin, BE, DE Full-time US citizenship/visa not required 3+ years About Langfuse Langfuse is building open-source observability and product analytics for LLM applications. We help engineers and companies understand how customers use their LLM applications and how they can improve on them. Have a look at our website and especially technical docs to learn more. About the role Skills: TypeScript, React In short: We hiring a design engineer (design-minded front-end engineer) to help us elevate our user’s experience. About Langfuse We help engineers and enterprises build and run LLM applications at scale. We are building the fastest growing open-source LLM engineering platform. 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 in-person from Berlin, Germany. 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. 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 Links Our codebase: GitHub Repository Ben Kuhn on Impact, Agency and Taste Who we are & how we work Technology https://github.com/langfuse/langfuse/ Stack: Frontend and Backend in Typescript (T3 Stack including NextJs, Tailwind, Prisma, tRPC), Postgres, Client facing SDKs in Python and Typescript Interview Process Fill out application & We screen your application Call: Intro & CV deep dive with CTO (45min) Call 2: Technical Deep Dive (90min) Onsite Super Day ( half or full day in Berlin Office ) Meet the other founders (short calls) Decision & Offer We expect you to have used Langfuse (you can sign up for a free account here) and skimmed through our documentation and public content.