About the company
Langfuse is part of ClickHouse, the team behind the database you're optimizing. Langfuse ingests terabytes of AI tracing data per day. When a Fortune 50 company instruments their application with Langfuse, they hit the infrastructure you built. Everything you ship is open source and immediately visible.
Responsibilities
- Own and optimize our ingestion pipeline: work on throughput, latency, reliability, and cost efficiency at every stage.
- Make ClickHouse fast: design schemas, optimize merge strategies, tune batch inserts, write and review analytical queries.
- Build new infrastructure-heavy features: LLM-as-a-Judge, alerting at scale, client-code execution, batch dataset operations.
- Test with real data in production: run load tests against production data to validate changes.
- Scale for what's next: think ahead about what breaks at 10x scale.
Requirements
- Strong backend engineer who gets excited about database internals, query optimization, and distributed systems.
- You get excited when working with a ton of data.
- Experience with analytical databases, data pipelines, or high-throughput event processing. ClickHouse experience is a big plus but not required.
- You organize yourself. Strong opinions about what to build and how to ship it.
- Comfortable reading and writing TypeScript (our backend) and SQL.
- Interest in open source software and enjoyment talking to users about scaling challenges.
- Thrives in a small, accountable team.
- CS or quantitative degree preferred.
Conditions
- Flexible work environment — globally distributed company and remote-friendly.
- Healthcare — employer contributions.
- Equity in the company — stock options.
- Time off — flexible in the US, generous entitlement in other countries.
- USD$500 home office setup if remote.
- Global gatherings — company-wide offsites.