Addition
C++ Engineer
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Senior Software Engineer (C++) – Contract
Join a globally recognised technology business supporting one of the world's leading online gaming platforms. This is an opportunity to work on a large-scale, business-critical C++ platform, helping modernise legacy systems while supporting a major cloud migration programme.
Role Overview
- Location: Remote, must be based in UK
- Package: £600 - £650pd Outside IR35
- Duration: 3 months (Sept - Dec)
- Industry: Technology / iGaming
What You’ll Be Doing
- Develop high-quality C++ within a large, established production codebase.
- Play a key role in migrating core platform capabilities from Windows to Linux as part of a wider modernisation programme.
- Refactor and modernise legacy components while maintaining stability and existing functionality.
- Build and enhance high-performance, low-latency, server-side systems supporting a live platform.
- Integrate platform services with AWS where required as part of the wider cloud programme.
- Use AI-assisted development tools, including Claude, to improve productivity while maintaining engineering quality.
- Collaborate closely with engineering teams, cloud specialists and stakeholders to deliver technical solutions and communicate progress effectively.
- Identify technical risks early and contribute to pragmatic, incremental improvements across the platform.
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Main Skills Needed
- Expert-level modern C++ development with recent, hands-on commercial experience.
- Proven commercial experience developing across both Windows and Linux environments is essential.
- Demonstrable experience modernising, upgrading and maintaining large, legacy C++ platforms.
- Strong understanding of multithreading, concurrency, memory management and performance optimisation.
- Server-side development experience with solid networking fundamentals, including TCP.
- Strong unit testing practices and experience working with CI/CD pipelines.
- Experience with build tools such as CMake, Git and automated testing frameworks such as GoogleTest or Catch2.
- Strong debugging skills using tools such as gdb, Valgrind or sanitizers.
- Exposure to AWS services, networking or containerisation is highly desirable.
- Previous experience within iGaming or online gambling is highly preferred. Candidates from other low-latency, real-time environments such as trading or financial services will also be considered.
- Experience using AI-assisted development tools—particularly Claude or similar LLM-powered coding assistants—will be heavily favoured.
- Python or scripting experience for automation is beneficial.
- Able to work independently, onboard quickly and communicate technical decisions clearly with both technical and non-technical stakeholders.
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What’s in It for You
- Work on a high-profile, enterprise-scale engineering programme.
- Help modernise a large C++ platform while contributing to a significant Windows-to-Linux migration.
- Collaborate with experienced engineering teams and AWS cloud specialists.
- Gain exposure to AI-assisted software development practices using Claude.
- Flexible remote/hybrid working within the UK.
- Long-term contract opportunity working on highly technical, performance-critical systems.
Think it could be a fit? We’d love to hear from you.
We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.
By applying you are confirming you are happy to be added to the Addition Solutions mailing list regarding future suitable positions. You can opt out of this at any time simply by contacting one of our consultants.
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