Strong backend engineer with a passion for database internals and distributed systems
Experience with analytical databases, data pipelines, or high-throughput event processing
Proficient in TypeScript and SQL
Organized with strong opinions on development and deployment
Interest in open source software and user engagement
Thrives in a small, accountable team environment
CS or quantitative degree preferred
Responsibilities
Own and optimize the ingestion pipeline for tracing data
Design schemas and optimize ClickHouse performance
Build new infrastructure-heavy features and explore frontend integration
Test new ClickHouse schemas and optimizations with real production data
Plan for scalability in response to rapid growth and new product directions
Benefits
Flexible work environment with remote options
Employer contributions towards healthcare
Equity in the company through stock options
Flexible time off policies
USD$500 home office setup for remote employees
Opportunities for global gatherings and in-person connection
Full Job Description
You will grow at Langfuse by
Own and optimize our ingestion pipeline: Langfuse ingests massive volumes of tracing data through a pipeline that flows from our API to ClickHouse. You'll work on throughput, latency, reliability, and cost efficiency at every stage of this pipeline.
Make ClickHouse fast: our tracing data lives in ClickHouse. You'll design schemas, optimize merge strategies, tune batch inserts, write and review analytical queries that power dashboards and the UI. You'll become an expert on ClickHouse internals - and you'll have the ClickHouse database engineering team one channel away.
Build new infrastructure-heavy features: things like LLM-as-a-Judge (where we post-process large volumes of ingested data asynchronously), alerting at scale, client-code execution, or batch dataset operations. Build the foundation and, if you like, dip your toes into the frontend for those.
Test with real data in production: when evaluating a new ClickHouse schema, migration, or query optimization, you'll run load tests against production data to validate that changes actually improve things. We don't guess at performance. We prototype new table designs, run them in parallel on real traffic, and compare before committing.
Scale for what's next: we're growing fast and new product directions like complex long-running agent observability and real-time evaluation push the infrastructure in new ways. You'll be thinking ahead about what breaks at 10x scale.
Learn more about our infrastructure
From Zero to Scale: Langfuse's Infrastructure Evolution - deep dive into how we went from Postgres to ClickHouse
Max talking infrastructure at ClickHouse OpenHouse Amsterdam - recording of our CTO walking through the architecture
Architecture
What we're looking for
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. You have 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 genuine enjoyment talking to users about their scaling challenges
Thrives in a small, accountable team where your output is visible and matters
CS or quantitative degree preferred
Bonus points:
Experience with ClickHouse, other OLAP databases, or observability infrastructure
Former founder
Background in building data-intensive systems at scale
Perks
Flexible work environment - ClickHouse is a globally distributed company and remote-friendly. We currently operate in over 25 countries.
Healthcare - Employer contributions towards your healthcare.
Equity in the company - Every new team member who joins our company 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 - We believe in the power of in-person connection and offer opportunities to engage with colleagues at company-wide offsites.
