Senior C++ Low-Latency Developer

• Design and build low-latency distributed systems for financial market data
• Develop performance-critical components using modern C++
• Own architecture, implementation, testing, optimization, and deployment
• Build systems supporting high-throughput and latency-sensitive workloads
• Optimize application performance across CPU, memory, networking, and concurrency
• Work with TCP, UDP, multicast, messaging, queuing, and Pub/Sub architectures
• Translate complex or ambiguous requirements into practical engineering solutions
• Balance rapid delivery with production-grade reliability and scalability
• Build comprehensive unit, integration, end-to-end, stress, and performance tests
• Collaborate with technical and business stakeholders throughout the development lifecycle

• Approximately 6+ years of professional C++ engineering experience
• Genuine production experience building low-latency systems
• Strong expertise in C++17 or newer, with C++20 strongly preferred
• Excellent understanding of modern C++ fundamentals and performance characteristics
• Strong computer science fundamentals
• Deep understanding of algorithms, data structures, and complexity
• Experience designing high-performance or distributed systems
• Strong knowledge of networking and communication protocols
• Experience with latency optimization and performance tuning
• Production experience within traditional financial markets
• Background in a proprietary trading firm, market maker, hedge fund, investment bank, or comparable electronic-trading environment
• Strong communication and stakeholder-management skills
• Ability to operate independently in technically demanding environments

Particularly valuable experience

• Direct market-data engineering experience
• Feed-handler or ticker-plant development
• Electronic or automated trading systems
• Exchange connectivity
• FIX or ITCH protocols
• Order-book infrastructure
• Smart order routing
• Tick-to-trade optimization
• Lock-free programming
• Kernel-bypass networking
• Solarflare / Onload
• DPDK
• NUMA-aware architecture
• Cache-aware system design
• High-availability and failover systems
• Idempotency and ACID guarantees

Strongly preferred background

• Proprietary trading
• Market making
• High-frequency trading
• Systematic hedge funds
• Investment-bank electronic trading
• Production market-data infrastructure
• Performance-critical financial systems

This role may not be the right fit if you

• Do not have genuine production low-latency C++ experience
• Have primarily academic or research-based C++ experience without production systems ownership
• Have no professional exposure to trading or financial-market infrastructure
• Have low-latency experience primarily within cryptocurrency trading environments rather than traditional financial markets
• Prefer management responsibilities over hands-on engineering
• Are not comfortable joining through an initial 12-month contract
• Are currently based outside the United Kingdom, Netherlands, or France
• Require visa sponsorship to work from your country of residence

What you’ll get

• Greenfield engineering ownership
• Exposure to highly sophisticated financial systems
• Challenging modern C++ development
• Complex low-latency and distributed-systems problems
• High-throughput financial market-data workloads
• End-to-end ownership from architecture to production
• Fully remote work across the UK, Netherlands, and France
• Potential transition into a permanent position after the initial contract
• Opportunity to work on technically demanding systems where engineering performance directly matters

This is a role that TechTree is recruiting for on behalf of one of its clients.

TechTree is an AI-driven recruitment platform working with high-growth companies.

When you apply, TechTree’s AI Agent matches you not just to this role, but to other relevant opportunities across its network, so one application can unlock multiple roles.

• Locations: United Kingdom, Netherlands, or France
• Work model: Fully remote
• Employment: 12-month contract
• Compensation: £200,000 - £300,000
• Conversion: Opportunity to convert to permanent by mutual agreement
• Level: Senior Individual Contributor
• Work authorization: Existing right to work in one of the listed countries of residence required

About the opportunity

• Join a sophisticated financial technology environment building high-performance trading infrastructure
• Work on greenfield systems processing high-throughput financial market data
• Design and develop performance-critical software using modern C++
• Own technical delivery from architecture through testing and production deployment
• Solve complex latency, networking, concurrency, and distributed-systems challenges
• Work in a senior hands-on engineering position rather than a management role