Langfuse is an open‑source observability platform that enables teams to develop, monitor, evaluate, and debug large language model (LLM) applications. It offers SDKs for Python and JavaScript, a unified dashboard, and tools for prompt management, automated testing, and human‑in‑the‑loop annotation, allowing developers and product managers to track cost, latency, and user feedback. The platform is self‑hosted in minutes and already trusted by thousands of users, from YC startups to enterprises such as Khan Academy and Twilio, for its reliability and performance. Langfuse’s distinctive value lies in its tight integration with popular LLM frameworks (OpenAI, LangChain, Llama‑Index, Vercel AI SDK) and its community‑driven open‑source ecosystem that fuels rapid iteration and continuous improvement.
Open Positions
Founding DevRel Engineer
Must have technical background, experience in creating content, and taste in good content
(Product) Designer
3+ years of experience, portfolio, good UI/UX understanding, and enthusiasm for open source software
Senior Frontend Engineer
Senior frontend engineer with 2-10 years of experience required, strong in React, TypeScript, and modern CSS
Senior Software Engineer (SDK)
3+ years of experience as a software engineer, strong understanding of performance, and experience building or maintaining SDKs
Senior Product Engineer
End-to-end product development experience, project management skills, and a passion for great developer experience
Product Engineer (Growth)
You must have a drive to learn fresh things, experience in full-stack development, and SQL skills. Nice-to-haves include experience with devtools and AI/LLM Engineering
Senior Backend Engineer
We are looking for a senior backend engineer with experience in database internals, query optimization, and distributed systems
Senior Technical Account Manager
Senior experience in a customer-facing technical role, strong technical foundation, demonstrated work in applied AI / AI engineering, excellent communication, and high ownership
Senior Forward Deployed Engineer
Senior experience, strong technical foundation, demonstrated work in applied AI, excellent communication, and high ownership