backend developer for AI observability

Langfuse ingests AI tracing data and provides open-source infrastructure for observability, data processing, and evaluation. It operates Langfuse Cloud and supports self-hosting across deployment environments.

• Own and optimize the data ingestion pipeline for throughput, latency, reliability, and cost efficiency
• Design ClickHouse schemas, optimize merge strategies, tune batch inserts, and write and review analytical queries for dashboards and the UI
• Build infrastructure-heavy features, including asynchronous LLM-as-a-Judge processing, large-scale alerting, client-code execution, and batch dataset operations
• Run load tests against production data to evaluate schemas, migrations, and query optimizations
• Prototype table designs, run them in parallel on real traffic, and compare results before committing changes
• Plan for infrastructure scaling as product directions expand, including long-running agent observability and real-time evaluation
• Operate Langfuse Cloud across production environments and support self-hosting from Docker Compose to enterprise-grade Helm chart deployments

• Strong backend engineering skills and interest in database internals, query optimization, and distributed systems
• Enjoy working with large volumes of data
• Experience with analytical databases, data pipelines, or high-throughput event processing
• Ability to organize work independently and form strong opinions about what to build and how to ship it
• Comfortable reading and writing TypeScript and SQL
• Interest in open-source software and enjoyment of discussing users’ scaling challenges
• Ability to thrive in a small, accountable team
• Будет плюсом: ClickHouse experience, other OLAP databases, observability infrastructure, former founder experience, background building data-intensive systems at scale, CS or quantitative degree

• Employer contributions toward healthcare
• Stock options for every new team member
• Flexible time off in the US and generous time off entitlement in other countries
• USD$500 home office setup allowance for remote employees
• Opportunities to attend company-wide offsites