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Test Triangle Ltd

Greater London / Global

C++ developer

Job Description

As a Senior C++ Engineer, you will be a member of a small, high performing team responsible for global derivatives algorithmic trading platform. Working closely with technologists, quants and traders to develop our in‑house trading technology and optimise it to achieve market‑leading performance and reliability.

Our proprietary trading platform includes everything from venue connectivity (feed handlers and ordering gateways) to trading engines to shared platforms that enable us to work quickly and efficiently – we are proud of our open and collaborative culture, so you'll have plenty of opportunity to find what fits you best.

Key Activities

Exchange Connectivity

Write software that communicates with exchanges through their APIs, receiving market data and sending orders over the network in different protocols, such as FIX, WebSocket or HTTP requests

Ensure quality of software based on a set of testing suites, which you are expected to use, maintain and extend

Optimize exchange communication through kernel bypass, optimising TLS or the connection handling to an exchange

Research exchange behaviour in detail to align our behaviour to that of an exchange

Implement these solutions using the provided exchange SDKs in different languages such as C++, Rust, Python, TypeScript

Trading Strategies

Implement trading algorithms based on requirements provided by traders and quants

Acquire and develop the necessary trading knowledge to successfully translate the requirements into actual software implementation

Continuously improve the stability, reliability, and performance of the trading engine

Enhance monitoring and observability in collaboration with the Trading Operations team

Investigate and resolve production issues such as crashes, unexpected business logic behaviour, and performance bottlenecks

Prepare for releases and deployments of new trading engine versions

Key Skills and Experience required

5+ years post‑graduation professional C++ software development experience within the Financial industry

Solid understanding of parallel, asynchronous, and multithreaded programming to build distributed systems

Good knowledge of algorithms and data structures

Strong analytical and problem‑solving skills, with the ability to analyse complex data sets and propose innovative solutions

Understanding of trading lifecycle, including order capture & execution, allocation workflow, settlement, and compliance requirements

Must have strong technical skills in scripting, Python, PowerShell, C#, SQL or other programming languages

Solid track record in application deployment best practices

Proactive system monitoring and troubleshooting, owning reliability improvements and ensuring their successful delivery

Soft Skills

Excellent communication skills to interact with traders, developers, and stakeholders

Thrives in high‑pressure situations while working alongside traders, developers and other engineering teams

Proactive, self‑motivated, and flexible with a positive attitude

Ability to work under demanding deadlines with changing priorities in a trading room environment

Ambition to solve open‑ended problems using analytical methods

Mandatory Skills

C++ Application Programming

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