C++ Software Engineer

🕒 July 28

🇬🇧 United Kingdom – Remote

⏰ Full Time

🟡 Mid-level

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 18%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Reactive Markets

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2019

💳 Fintech

🤝 B2B

💸 Finance

Fintech • B2B • Finance

Reactive Markets is a financial infrastructure company that provides ultra-low-latency connectivity and execution for institutional trading across FX, equities and other asset classes. Its network connects clients to 35+ liquidity providers with deterministic sub-50 microsecond end-to-end latency, accessible via a single API, UI, or integrations with EMS/OMS/pricing engines. The platform is engineered for bilateral trading, systematic and manual strategies, and offers real-time latency reporting, analytics, global deployment (New York, London, Singapore), and FCA-regulated services for professional market participants.

📋 Description

• build low-latency trading infrastructure on Linux • 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 • own the full lifecycle — from design through to operational excellence • investigate and fix issues in production • 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

🎯 Requirements

• 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

🏖️ Benefits

• up to 30 days leave + bank holidays • private health insurance • pension • life insurance • dental/optical cashback • cycle to work • socials and offsites