Hybrid
Langfuse
Backed byY CombinatorAbout Langfuse
Langfuse is the open-source LLM engineering platform designed to help teams build production-grade LLM applications faster.Langfuse addresses these challenges by providing an open-source platform to debug and improve LLM applications. Langfuse captures the full context of your application, tracing the complete execution flow—including API calls, retrieved context, prompts, parallelism, and more. By enabling hierarchical representations through nested traces, Langfuse helps you understand complex logic built around LLM calls. Langfuse also offers full **multi-modal** support, including audio, images, and attachments.Metrics & QualityLangfuse measures cost and latency, breaking down metrics by user, session, feature, model, and prompt version, allowing for detailed analysis. To assess output quality, Langfuse facilitates the collection of user feedback, performs automated LLM-as-a-judge evaluations, and supports manual data labeling within the platform. It also offers **prompt management** features, allowing you to handle prompts effectively and perform **prompt experiments** over new ideas and systematically track success.Testing & ExperimentationFor testing and experimentation, Langfuse supports versioning your application and running tests of expected inputs and outputs via curated datasets. This provides quantitative insights into the impact of changes, helping you understand and improve your LLM applications more effectively.
Open positions · 2
San Francisco · Hybrid
Company at a glance
Founders & Leadership
Location
Why Clera highlights Langfuse
About the Team
Team Distribution
- Engineering63%
- Leadership19%
- Sales13%
- Operations6%
Where the Team Studied
- 1.Technical University of Munich
- 2.The London School of Economics and Political Science
- 3.University of Mannheim
- 4.University of California, Berkeley
- 5.WHU – Otto Beisheim School of Management
Team Worked At
- Microsoft
- Fraunhofer AISEC
- Snowflake
- McKinsey & Company
Team Composition
14 people- Engineering1 senior8
- Entrepreneurship3 senior3
- Business Development1
Funding History
$4M
raised
Open-source LLM observability platform Langfuse raised a $4M seed round from Lightspeed Venture Partners, La Famiglia and Y Combinator
Life at Langfuse
Frequently asked questions
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