Lead ClickHouse Engineer

Lead ClickHouse Engineer Remote (UK-based) | Full-Time About Us Reactive Markets is the 2026 OTC Trading Platform of the Year (). Our network handles over $50 billion in daily trading volumes across FX, Equities, and Cryptocurrency, connecting 40+ of the world's leading liquidity providers. We build trading systems that operate at the edge of what's technically possible — where nanoseconds matter and a dropped message costs real money. Our engineering team is small, senior, and deeply invested in the craft of building cutting edge, reliable, high-performance systems. The Role We're looking for a Lead ClickHouse Engineer to own our data plant: a multi-datacentre, multi-AZ ClickHouse cluster ingesting billions of rows a day, underpinning compliance, billing, and a growing family of real-time and historical analytics. This is a core-platform engineering role, not a DBA role. You'll own the full engineering scope of a serious ClickHouse estate: cluster operations and upgrades, schema and sorting-key design, materialised views, ingestion performance, query optimisation, workload isolation, capacity planning, storage tiering, backup and recovery, monitoring and alerting, and production support. You'll also set direction and work on the data pipelines around the plant — our capture services are Go, and our analytics foundation is Python. Beyond your own technical ownership, you'll set the standard for how the estate is run, mentor the engineers who work alongside you, and ensure the plant is genuinely supportable by a team rather than dependent on any one person — including yourself. You don't need years of ClickHouse specifically — deep experience with another columnar or large-scale time-series database qualifies you, and a strong columnar engineer learns our estate quickly. What we do need is genuine operational depth: you have run a production data platform, owned its capacity plan and its recovery procedures, and stayed calm when it mattered. This hire helps create a