Job Vacancy Software Engineer (C++)

Gloucester

CGI

Job position Software Engineer (C++)

Permanent

As soon as possible

Gloucester, England, United Kingdom

Published on 13/11/2025

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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.

Candidate profile

In this role, you will engineer high-performance, secure software systems that underpin mission-critical defence operations. You’ll collaborate with clients and cross-functional teams to design, develop, and deliver robust solutions that meet exacting standards of performance and reliability. Your expertise will directly influence the success of strategic projects, ensuring our clients maintain a technological edge in national security.

You’ll take ownership of your work from concept through delivery, bringing creativity and precision to every challenge. Supported by CGI’s collaborative culture, you’ll have opportunities to innovate, contribute to technical direction, and build a rewarding, purpose-driven career.

Key responsibilities:

Design & Develop: Create and maintain high-quality, modern C++ software solutions aligned with mission objectives.

Collaborate & Innovate: Work closely with multidisciplinary teams and clients to translate technical requirements into effective solutions.

Optimise & Secure: Apply secure coding standards, performance optimisation, and rigorous testing practices.

Deliver & Evolve: Contribute to Agile ceremonies, CI/CD pipelines, and continuous improvement initiatives.

Document & Communicate: Produce clear technical documentation and contribute to knowledge-sharing across teams.

Required qualifications to be successful in this role

You should have strong experience developing secure, high-performance software using modern C++ and be passionate about delivering reliable systems that make a real difference. A background in defence, aerospace, or similar high-assurance environments is advantageous but not essential.

Essential qualifications:

Proven experience with modern C++ (C++11 and above) and OOD principles.

Solid understanding of multithreading, concurrency, and real-time software design.

Familiarity with Linux and cross-platform development environments.

Experience with CI/CD tools, version control, and unit testing frameworks.

Awareness of secure coding standards and best practices.

Strong analytical and problem-solving skills, with the ability to work effectively in collaborative teams.

Desirable qualifications:

Experience in embedded or mission-critical systems.

Knowledge of middleware technologies (e.g., DDS, ZeroMQ) and scripting (Python, Bash).

Understanding of Agile delivery models such as Scrum or SAFe.

#LI-JS2

Working environment

Together, as owners, let’s turn meaningful insights into action.

Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll reach your full potential because…

You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.

Your work creates value. You’ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.

You’ll shape your career by joining a company built to grow and last. You’ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.

Come join our team—one of the largest IT and business consulting services firms in the world.

Discover CGI

London, England, United Kingdom

> 1000 employees

IT services

We are a global business with 91,500 professionals across hundreds of locations worldwide, providing end-to-end IT and business process services that drive our clients’ businesses. In the UK alone, we have around 6,000 member-partners working across 19 towns and cities, doing everything from writing complex code to designing sophisticated software solutions. The work we do powers some of the most ambitious projects that touch the lives of many. Our approach sets us apart, characterised by our proximity model, international presence, expertise, and operational excellence. We organise our operations within metro markets where our clients have concentrated footprints, empowering our local teams to build trusted, in-person relationships. As you build your career here, you’ll develop your skills, share your insights, and work side-by-side with colleagues and clients on innovative solutions that address the most complex issues. Our commitment to ownership, flexibility, and being approachable makes us easy to do business with. Join us, and together, as owners, let’s turn meaningful insights into action to meet the needs and balance the interests of our clients, shareholders, communities, and each other. Benefits: - Insurance coverage - Medical benefits - Pension plan - Member Assistant Programme - Check4Cancer - Flexible time off - Share Purchase Plan - Member discounts - Dental benefits - Vision benefits - Profit Participation Plan - Health and Wellbeing Programme

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Software Engineer (C++)

CGI