Langfuse - Senior Backend Engineer

The role

You will own and optimize the ingestion pipeline and ClickHouse data models to make Langfuse fast and affordable at scale. You will build backend abstractions, operate Langfuse Cloud, and support deployments from Docker Compose to Helm charts.

What you will do

• Own and optimize the ingestion pipeline
• Design schemas, optimize merge strategies, tune batch inserts, and write analytical queries for ClickHouse
• Build new infrastructure-heavy features like LLM-as-a-Judge, alerting at scale, and client-code execution
• Run load tests against production data to validate ClickHouse schema and query optimizations
• Operate Langfuse Cloud across multiple production environments
• Support self-hosting from Docker Compose to enterprise-grade Helm chart deployment
• Scale infrastructure for new product directions like agent observability and real-time evaluation

Required qualifications

• Strong backend engineer with interest in database internals, query optimization, and distributed systems
• Experience with analytical databases, data pipelines, or high-throughput event processing
• Comfortable reading and writing TypeScript and SQL
• Interest in open source software
• Ability to thrive in a small, accountable team

Nice to have

• ClickHouse experience
• Other OLAP databases experience
• Observability infrastructure experience
• Former founder
• Background in building data-intensive systems at scale
• CS or quantitative degree

Benefits

• Flexible work environment
• Employer contributions towards healthcare
• Stock options
• Flexible time off in the US or generous entitlement in other countries
• USD$500 Home office setup for remote employees
• Global Gatherings and company-wide offsites

About the company

Langfuse is part of ClickHouse. Langfuse ingests terabytes of AI tracing data per day and ships everything as open source.