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
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 Software Engineer (SDK)
3+ years of experience as a software engineer, strong understanding of performance, and experience building or maintaining SDKs
Product Engineer (Integrations)
Passionate about the LLM ecosystem, strong in Python and/or TypeScript, and excited about open source and developer community
(Senior) Backend Engineer (IAM and Billing)
Strong backend engineer with experience in authentication, authorization, and billing, as well as a good understanding of security and edge cases
Senior Software Engineer (SDK)
Strong engineer with experience building or maintaining SDKs, client libraries, or developer tools
Product Engineer (Growth)
Must-haves: drive to learn fresh things, business sense, full-stack development experience, SQL skills, and user-centric thinking. Nice-to-haves: devtools, OSS ecosystems, UX, and AI/LLM Engineering experience
Senior Backend Engineer (Data Infrastructure)
We're looking for a senior backend engineer with strong backend experience, analytical databases, and distributed systems knowledge
Senior Product Engineer
Senior Product Engineer with experience building features end-to-end, managing projects, and delivering great developer experience
(Senior) Backend Engineer (IAM and Billing)
Strong backend engineer with experience in authentication, authorization, and billing, and a focus on security and reliability
Senior Backend Engineer
We are looking for a senior backend engineer with experience in database internals, query optimization, and distributed systems
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