Marc Klingen
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Marc Klingen is the co-founder and CEO of Langfuse. Langfuse was started during Y Combinator’s W23 batch in San Francisco, and the company builds an LLM engineering platform for tracing, evaluations, prompt management, and metrics. Before Langfuse, Klingen worked across product, sales, business intelligence, and full-stack engineering at companies including Google, DHL, and early-stage startups. He is known for co-founding Langfuse and for his public work on its open-source platform and repositories.
Updated 11 September 2026
Public sources: langfuse.com ycombinator.com github.com
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