[Hiring] Senior Backend Engineer @ClickHouse

Role Description

Your work will have an outsized impact. 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.

The core of your role is making Langfuse fast and affordable at scale:

• Owning the ingestion pipeline.
• Optimizing ClickHouse data models and queries so dashboards load instantly.
• Building the backend abstractions that let product engineers ship data-heavy features without reinventing the plumbing each time.

You will also make sure Langfuse runs everywhere:

• Operating Langfuse Cloud across multiple production environments.
• Making self-hosting effortless.
• Supporting a single Docker Compose setup to enterprise-grade Helm chart deployment.

You won’t be solving these problems alone. Langfuse is now part of ClickHouse, which means the people who built the database you’re optimizing are one channel away. Few backend roles give you that kind of access to the internals of your core datastore.

You will grow at Langfuse by:

• Owning and optimizing our ingestion pipeline: working on throughput, latency, reliability, and cost efficiency at every stage of this pipeline.
• Making ClickHouse fast: designing schemas, optimizing merge strategies, tuning batch inserts, writing and reviewing analytical queries that power dashboards and the UI.
• Building new infrastructure-heavy features: such as LLM-as-a-Judge, alerting at scale, client-code execution, or batch dataset operations.
• Testing with real data in production: running load tests against production data to validate that changes actually improve performance.
• Scaling for what's next: thinking ahead about what breaks at 10x scale.

Qualifications

• Strong backend engineer who gets excited about database internals, query optimization, and distributed systems.
• Experience with analytical databases, data pipelines, or high-throughput event processing. ClickHouse experience is a big plus but not required.
• 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.

Requirements

• Organized with strong opinions about what to build and how to ship it.

Bonus Points

• 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, currently 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: As part of a rapidly scaling start-up, you will be instrumental in shaping our culture.