Jobs at Reactive Markets

Own the finance function, including month-end close, management accounts, balance sheet reconciliation, cash flow forecasting, VAT returns, statutory accounts, and year-end audit. Manage AR/AP staff, oversee payroll and HMRC processes, coordinate multi-entity and intercompany accounting, improve finance systems, and provide financial modelling, risk analysis, and investor funding support.

Develop and optimize performance-critical components of a low-latency trading platform (pricing engines, gateways, market-data, messaging). Own design, deployment, production support, observability, and architectural decisions. Mentor engineers, conduct reviews, and ensure reliability in cloud-native AWS and colocated environments.

Provide Level 1/2 operational coverage for a low-latency trading platform: monitor live systems, triage alerts, execute runbook actions, manage production configuration delivery and client onboarding, drive incident RCA and documentation, and contribute to automation and AI-assisted tooling to reduce toil and improve reliability.

Lead FIX client onboarding and integrations across FX, equities, and digital assets. Manage projects from requirements through certification and production go-live; configure, test and validate FIX sessions; troubleshoot connectivity and production issues; provide frontline EMEA technical support; document procedures and collaborate with engineering, product, and account teams while using AI/automation to streamline processes.

Senior full-stack engineer building high-performance trading systems in TypeScript and Rust. Develop real-time, data-dense React UIs with reactive state management, design distributed systems (REST, WebSockets, TCP/UDP), own end-to-end lifecycle, ensure observability and reliability, mentor peers, and support production incidents.

Build and maintain low-latency trading infrastructure on Linux using modern C++ and Go. Work on pricing engines, connectivity, market-data pipelines, FIX integrations, messaging, observability, and production support. Own design, deployment, incident response, and continuous performance optimization.