Job Opportunities API

C++ SOFTWARE ENGINEER Remote (UK-based) | Full-Time ABOUT US Reactive Markets is the 2026 OTC Trading Platform of the Year (Risk.net http://Risk.net). 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 C++ Software Engineer who wants to build low-latency trading infrastructure on Linux. You'll work on the core components of our Switchboard trading platform — pricing engines, connectivity gateways, market-data systems, and the messaging layer that ties them together. This is not a role where you write code and throw it over a wall. You build it, you test it, you deploy it, you support it in production, and you improve it. Our engineers own the full lifecycle — from design through to operational excellence. When something breaks at 4pm on a Friday, you're part of the team that investigates and fixes it. Occasional hours outside the normal working day are required for production releases, scheduled maintenance windows, and Level 3 support during critical incidents. We keep this to a minimum and recognise the commitment — but owning a production trading platform means being there when it matters. WHAT YOU'LL WORK ON - Modern C++20 and Go on Linux — a modern software stack based on open source - Cloud-native infrastructure on AWS with colocation in key data centres - Microsecond-level latency optimisation and high-throughput messaging - Market-data and reference-data pipelines across multiple asset classes - FIX protocol integrations with global banks and liquidity providers - Observability and monitoring — dashboards, alerting, and metrics that make system behaviour visible - Production systems that handle real money — reliability is not optional WHAT WE NEED Technical: - Strong C++ with Linux systems programming (3+ years) - Comfortable working close to the metal — you understand what's underneath your code - Experience with performance-sensitive systems (profiling, optimisation, deterministic behaviour) - Familiarity with networking fundamentals (TCP/UDP, socket programming) - Go experience is a strong bonus — we use Go extensively for microservices and command-line tooling, and you'll be expected to work with it internally. If you don't know it yet, strong C++ engineers pick it up quickly - Python for scripting, automation, testing, and data analysis — used across the platform for tooling and operational workflows - Git and shell scripting - Experience in financial services or trading technology is a plus but not essential How you work: - You ship. You're delivery-focused — you iterate, you improve, you get things into production - You own it. When you build something, you take responsibility for its behaviour in production. You respond to incidents (15-minute acknowledgement SLA during working hours), investigate issues, and close the loop - You write things down. Documentation is not an afterthought — it's how we scale knowledge across a distributed team. If it's not written down, it doesn't exist - You communicate. We're a distributed team across multiple time zones. Clear, proactive communication — especially when things go wrong — is essential - You care about quality. You write clean, testable code. You review your peers' work thoughtfully. You push for continuous improvement without gold-plating - You embrace AI tooling. We use AI tools (Claude, Gemini) to amplify our engineering capability — from code review and debugging to incident investigation and documentation. You don't need to be an expert, but you sho