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Senior C++ Software Engineer 12 month contract - £600 to £850 per day inside Global Trading & Supply | High-Performance Trading Technology As a Senior C++ Software Engineer, you'll collaborate with technologists, quants, and traders to build and optimise our in-house global derivatives trading platform. You'll work across the full stack of proprietary trading technology - from exchange connectivity to trading engines - with the autonomy and impact of a high-performance engineering culture. You will play a key role in ensuring ultra-low latency performance, reliability, and scalability while shaping the next generation of our trading systems. What You'll Work On Exchange Connectivity Develop software that interacts with major global futures exchanges via native APIs & protocols (FIX, WebSocket, HTTP). Maintain and extend testing suites to ensure robust connectivity performance. Optimise exchange communication through Kernel bypass, TLS tuning, and advanced networking techniques. Study and align with detailed exchange behaviours. Work across C++, Rust, Python, and Typescript where required. Trading Strategies Build and enhance algorithmic trading strategies from trader and quant requirements. Increase the performance, reliability, and stability of the trading engine. Improve monitoring and observability alongside Trading Operations. Diagnose and resolve production issues (crashes, logic anomalies, latency bottlenecks). Support release preparation and deployment of trading engine versions. Technical Experience 5+ years post-graduation C++ experience in the financial markets. Strong multi-threaded, asynchronous, and distributed systems engineering background. Deep knowledge of algorithms and data structures. Understanding of the full exchange-traded derivatives life cycle. Strong Scripting and automation skills (Python, PowerShell, C#, SQL etc.). Proven track record in application deployment best practices and proactive system monitoring. Industry Experience 8+ years in Trading, Capital Markets, or Investment Banking environments. Familiarity with global futures exchanges and their native protocols. For information please APPLY NOW!

C# .net Software Engineer Our Client is looking to recruit a Software Engineer with solid 5 plus years of developing and working C# .net in an Agile environment. Essential skills and characteristics: • Senior-level knowledge of C# and .NET Core (5+years) • Experienced with ASP.NET (Web API) • Knowledge of OOP, SOLID principles, clean code • Knowledge of using unit tests and familiarity TDD approach • Knowledge of Git • Experience in coding and debugging in Visual Studio • Ability to work in an Agile environment • Strong communication skills • Self-driven; Being able to work independently • Self-organized • Self-efficient • Strong teamworking skills Good-to-have skills and characteristics: • Open XML SDK for office • Dev Ops skills • Experience with docker • Snowflake • SQL • Python • Basic frontend dev (HTML, CSS, JS). Other skills: • Work in a highly collaborative environment with cross-functional teams on projects ranging from a few months to a few quarters in length • Clearly and concisely communicate highly technical challenges and solutions to stakeholders and non-technical team members • Maintain high standard of quality as you creatively and strategically problem solve throughout the product delivery process • Be able to effectively communicate your work with both technical and non-technical peers • Build solid back-end architectures that integrate easily with other systems and technologies • Understand design patterns and write reusable, modular code • Have a superior attention to detail and a strong ability to Q/A one’s own work required, including cross-browser and cross-platform displays and performance • Experience in testing and debugging applications • Performance tuning, improvement, balancing, usability, automation • Polish-speaking is a big advantage The Client would ideally prefer the candidate to be based in Poland and in particular in Krakow. The daily rate/salary is negotiable. Please send your CV to us in Word format along with your rate/salary and availability.

C# .net Software Engineer Our Client is looking to recruit a Software Engineer with solid 5 plus years of developing and working C# .net in an Agile environment. Essential skills and characteristics: • Senior-level knowledge of C# and .NET Core (5+years) • Experienced with ASP.NET (Web API) • Knowledge of OOP, SOLID principles, clean code • Knowledge of using unit tests and familiarity TDD approach • Knowledge of Git • Experience in coding and debugging in Visual Studio • Ability to work in an Agile environment • Strong communication skills • Self-driven; Being able to work independently • Self-organized • Self-efficient • Strong teamworking skills Good-to-have skills and characteristics: • Open XML SDK for office • Dev Ops skills • Experience with docker • Snowflake • SQL • Python • Basic frontend dev (HTML, CSS, JS). Other skills: • Work in a highly collaborative environment with cross-functional teams on projects ranging from a few months to a few quarters in length • Clearly and concisely communicate highly technical challenges and solutions to stakeholders and non-technical team members • Maintain high standard of quality as you creatively and strategically problem solve throughout the product delivery process • Be able to effectively communicate your work with both technical and non-technical peers • Build solid back-end architectures that integrate easily with other systems and technologies • Understand design patterns and write reusable, modular code • Have a superior attention to detail and a strong ability to Q/A one’s own work required, including cross-browser and cross-platform displays and performance • Experience in testing and debugging applications • Performance tuning, improvement, balancing, usability, automation • Polish-speaking is a big advantage The Client would ideally prefer the candidate to be based in Poland and in particular in Krakow. The daily rate/salary is negotiable. Please send your CV to us in Word format along with your rate/salary and availability.

At CGI, we’re redefining what’s possible in the Space, Defence, and Intelligence sector delivering secure, mission-critical systems that protect the UK and drive national capability. As a C++ Software Engineer, you’ll help design and implement next-generation solutions that enable operational excellence and resilience in the most demanding environments. You’ll be part of a trusted team that values innovation, ownership, and collaboration—empowering you to shape the future of defence technology while advancing your own career through continuous learning and professional growth. CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK ‘Best Employer’ by the Financial Times. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and you’ll be part of an open, friendly community of experts. We’ll train and support you in taking your career wherever you want it to go. Due to the highly secure nature of the work, this role is only open to sole UK Nationals who hold or are eligible to hold High-Level Clearance (HLC). While hybrid or remote working may be possible, regular attendance at the secure site will be required.