C
Langfuse - Senior Backend Engineer
Contract type
Ongoing
Work mode
Remote · Germany
Experience
Senior · Not stated
Level inferred from job title
Job description
Backend engineering role at Langfuse (part of ClickHouse) focused on making the AI tracing platform fast and affordable at scale by owning the ingestion pipeline and optimizing ClickHouse data models and queries. The role also involves operating Langfuse Cloud and making self-hosting effortless.
At a glance
- Employment
- Full-time · Employee (employment agreement)
- Work mode
- Remote · Germany
- Languages
- English
What you'll do
- Own and optimize the ingestion pipeline from the API to ClickHouse, working on throughput, latency, reliability, and cost efficiency at every stage
- Design ClickHouse schemas, optimize merge strategies, tune batch inserts, and write and review analytical queries that power dashboards and the UI
- Build new infrastructure-heavy features such as LLM-as-a-Judge, alerting at scale, client-code execution, or batch dataset operations
- Test with real data in production: run load tests against production data, prototype new table designs in parallel on real traffic, and compare before committing
- Operate Langfuse Cloud across multiple production environments and make self-hosting effortless, from a single Docker Compose setup to enterprise-grade Helm chart deployment
- Think ahead about what breaks at 10x scale as new product directions like long-running agent observability and real-time evaluation push the infrastructure
What we're looking for
- Strong backend engineer excited about database internals, query optimization, and distributed systems
- Excitement about working with a ton of data
- Experience with analytical databases, data pipelines, or high-throughput event processing
- Self-organized with strong opinions about what to build and how to ship it
- Comfortable reading and writing TypeScript (the backend) and SQL
- Interest in open source software and genuine enjoyment talking to users about their scaling challenges
- Thrives in a small, accountable team where output is visible and matters
- CS or quantitative degree preferred
Nice to have
- Experience with ClickHouse, other OLAP databases, or observability infrastructure
- Former founder
- Background in building data-intensive systems at scale
Benefits
Flexible work environment - ClickHouse is a globally distributed company and remote-friendly, operating in over 25 countries
- Healthcare - employer contributions towards your healthcare
- Equity in the company - every new team member receives stock options
- Time off - flexible time off in the US, generous entitlement in other countries
- A USD$500 home office setup if you're a remote employee
- Global Gatherings - opportunities to engage with colleagues at company-wide offsites
- Culture - you will be instrumental in shaping our culture
Apply
About ClickHouse
ClickHouse is a globally distributed, remote-friendly company operating in over 25 countries. Langfuse is now part of ClickHouse.
Key facts
- Langfuse ingests terabytes of AI tracing data per day
- Langfuse is now part of ClickHouse
- ClickHouse operates in over 25 countries
- Every new team member who joins receives stock options