Senior Full Stack Developer

Senior Full Stack Developer

Location:

United Kingdom (UK Wide - Various)

Position : J

Employment Type:

Full Time

At CGI, you’ll help design and deliver modern digital solutions that power critical services and enable organisations to thrive in an increasingly connected world. In this role, you’ll shape scalable, cloud‑first applications that deliver real business outcomes for our clients, combining robust engineering with creative problem‑solving. You’ll work in an environment where ownership is encouraged, ideas are valued, and collaboration drives innovation, supported by experienced teams who invest in your growth.

Together, we turn complex challenges into high‑value solutions that make a lasting impact across industries and communities.

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.

In this role, you will design, build, and enhance full stack applications using modern .NET technologies and contemporary front‑end frameworks. You’ll take responsibility for delivering high‑quality features end to end, contributing to cloud‑native architectures and ensuring solutions are secure, scalable, and reliable. Working closely with product, design, and engineering colleagues, you’ll help shape technical direction while continuously improving how we build and deliver software.

You’ll also play an active role in driving better ways of working, contributing ideas, refining practices, and sharing knowledge within a supportive, collaborative team environment.

• Design and develop scalable web applications using C# and .NET/.NET Core
• Build and optimize secure APIs and back‑end services
• Develop responsive front‑end features using JavaScript/Type Script and frameworks such as React or Angular
• Deploy and manage applications on AWS, leveraging containerisation and orchestration
• Implement and maintain CI/CD pipelines to enable reliable, automated delivery
• Collaborate and contribute to continuous improvement across engineering practices

You should have strong experience delivering full stack solutions in a cloud environment, with a solid grounding in .NET development and modern front‑end technologies. You’ll bring a proactive mindset, the ability to take ownership of your work, and a passion for building well‑engineered, maintainable systems within collaborative teams.

• Proven experience with C#, .NET/.NET Core and full stack development
• Strong front‑end experience with JavaScript/Type Script and React or Angular
• Hands‑on experience deploying applications to AWS
• Practical knowledge of Docker and Kubernetes
• Experience with CI/CD tools and automated deployment pipelines
• Ability to work effectively within cross‑functional, agile teams

• Application Deployment
• Full Stack Development

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 one 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.

Have you been referred by a CGI Partner for this position? Please provide the partner’s email: