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At CGI, we deliver cutting-edge software solutions that help protect the UK's national interests and support critical national security programmes. As a Backend / Platform Software Engineer, you'll play a key role in designing, building, and deploying cloud-native applications that drive mission success. Working across software engineering, platform technologies, and automation, you'll help create scalable, resilient solutions while contributing to a culture that values innovation, collaboration, and ownership. You'll have the opportunity to make a meaningful impact, influence technical outcomes, and develop your expertise alongside highly skilled professionals tackling some of the most complex challenges in the industry. 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 secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This role is based on a Secure Site.