Job Description

C++ SOFTWARE ENGINEER - TRADING SYSTEMS
Up to 300,000 total
Global Quantitative Trading Firm
London - Hybrid (4 days onsite / 1 remote)
Quant Capital is working with a technology-first trading firm to find a C++ Software Engineer to join a highly specialised team building real-time trading infrastructure. The team's scope covers everything from market data processing and signal evaluation to order routing and execution-giving developers full ownership over performance-critical code.
This is a low-latency, high-throughput environment where the software you write is deployed directly into production and contributes to daily trade volumes in the hundreds of billions.
Role Overview
You'll work in a fast-moving team responsible for the full software lifecycle behind the firm's core trading platform. In addition to building latency-sensitive code in C++, you'll have the chance to work on adjacent systems like distributed storage platforms, high-performance compilers, and GPU/FPGA integrations.
The team is highly technical, cross-functional, and trusted to solve hard problems autonomously.
Key Responsibilities

• Design and implement high-performance C++ systems used across trading infrastructure
• Work on projects ranging from real-time market data processing to order execution
• Optimise systems at the micro-architectural level (cache usage, CPU pipelines, memory layout)
• Contribute to the design of distributed or parallel computation frameworks
• Collaborate with researchers, infrastructure teams, and hardware specialists
• Write clean, maintainable, post-C++11 code and modernise existing components where needed

What You'll Need

• Strong command of modern C++ and associated tooling
• Deep understanding of system internals: memory management, caching, paging, CPU execution pipelines
• Solid knowledge of algorithms, data structures, and performance trade-offs
• Experience designing complex systems intended for long uptime and high availability
• Familiarity with Linux systems and tooling is beneficial but not essential
• Comfortable working independently on technically challenging problems
• No finance background needed-just engineering fluency

Why Apply?

• Work on production systems that process hundreds of billions in trading volume daily
• Solve real performance problems-not proxy metrics or arbitrary benchmarks
• Blend low-level systems programming with high-level architecture and impact
• Build for internal use, with fast deployment cycles and immediate feedback
• Join a small, high-performance team with serious technical ownership

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