Senior C++ Software Engineer

🕒 July 28

🇬🇧 United Kingdom – Remote

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 27%

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

• Shape the technical direction of our Switchboard trading platform • Work on performance-critical components like pricing engines and connectivity gateways • Build, test, deploy, and support production systems • Provide technical oversight and mentor engineers • Maintain quality standards and contribute to architectural decisions

🎯 Requirements

• Strong C++ with Linux systems programming (5+ years) • Comfortable working close to the metal • Proven track record of optimising complex, latency-sensitive systems • Deep understanding of distributed systems architecture and network protocols (TCP/UDP, socket programming, FIX) • Experience with system design and architectural trade-offs • Go experience is a strong bonus • Python for scripting, automation, testing, and data analysis • Git and shell scripting • Experience in financial services or trading technology is a plus

🏖️ Benefits

• Up to 30 days leave + bank holidays • Private health insurance • Pension • Life insurance • Dental/optical cashback • Cycle to work scheme • Socials and offsites