Node.js Developer (AI Infrastructure) @ Langfuse

Langfuse is an open-source observability platform for LLM applications. We're hiring a Node.js Developer to work on our Node.js and TypeScript SDKs, which developers use to trace and evaluate their AI pipelines. You'll design clean SDK APIs, handle async trace flushing, and maintain integrations with OpenAI, Anthropic, and LangChain. TypeScript and Node.js proficiency is required. Experience with LLM APIs or observability tooling is a bonus.