Senior Software Engineer (C# / .Net)

In this role, you will take ownership of designing, building and delivering robust software solutions using C# and modern web technologies. You'll work across the full development lifecycle, shaping architectural decisions, strengthening authentication approaches and ensuring high-quality delivery through automated pipelines and cloud-native practices. Supported by experienced colleagues, you'll be encouraged to innovate, share ideas and continuously improve how solutions are built and deployed.

You will collaborate closely with cross-functional teams to deliver scalable, containerised applications on AWS, contributing to CI/CD best practices and helping ensure platforms are secure, reliable and ready to evolve as client needs grow., * Design & Develop high-quality C# and .NET MVC applications

• Own & Improve authentication patterns and application architecture
• Build & Maintain CI/CD pipelines using GitHub Actions
• Deploy & Operate containerised solutions using Docker and Kubernetes
• Collaborate & Innovate with engineers, architects and stakeholders
• Optimise & Support cloud-native solutions on AWS

You will bring strong hands-on experience as a C# software engineer, with a passion for building reliable web applications and improving development practices. You should be comfortable working in cloud environments, contributing to DevOps pipelines and taking accountability for the quality and impact of your work while collaborating within supportive, high-performing teams.

You should have:

• Proven experience developing C# and .NET MVC web applications
• Strong understanding of CI/CD pipelines, ideally using GitHub Actions
• Experience with AWS and cloud-native application development
• Familiarity with Docker and Kubernetes
• Exposure to TypeScript, Node.js or backend scripting
• A collaborative mindset with the ability to take ownership and drive solutions forward
• .NET
• Node.Js

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

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.

At CGI, you'll play a pivotal role in designing and delivering secure, scalable software solutions that help our clients modernise, transform and succeed. Joining a collaborative team of experts, you'll shape critical platforms from architecture through to deployment, applying creativity, ownership and technical excellence to deliver real-world impact. We empower our people to influence outcomes, innovate with confidence and grow their careers while working on meaningful programmes that shape the future of digital services across the UK., 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.