Senior Software Engineer; Full Stack

Position: Senior Software Engineer (Full Stack)
Position

Description:

At CGI, our Senior Full Stack Software Engineers play a pivotal role in shaping the digital services that help organisations innovate, grow and succeed. As we expand our engineering capability across our business, you'll deliver secure, scalable solutions that combine intuitive user experiences with robust back-end technology. You'll have the freedom to take ownership of complex engineering challenges, explore creative approaches and influence technical decisions that deliver meaningful results for our clients.

Working alongside supportive, multidisciplinary teams, you'll continue developing your expertise while helping drive engineering excellence, modernise critical services and create lasting value for businesses 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.

You will need to hold UK Security Clearance (SC level) or be eligible to go through this clearance. Our teams operate within a flexible hybrid working model, however on-site requirements vary by project, so the ability to travel (expensed away from base office) as required to meet client needs is essential.

Your future duties and responsibilities:

In this role, you will take ownership of designing, developing and delivering secure, scalable full stack applications that support critical client services. Working across the complete software development lifecycle, you'll combine modern front-end technologies with robust back-end engineering to create reliable, high-performing digital solutions. You'll influence technical approaches, champion engineering best practices and help ensure every solution delivers meaningful value to clients and users.

You'll collaborate with talented engineers, architects and stakeholders to solve complex challenges, explore innovative technologies and continuously improve delivery. Within CGI's supportive engineering community, you'll have opportunities to share your expertise, develop new capabilities and contribute to a culture of technical excellence and continuous learning.

Key responsibilities:

• Design & Deliver:
Architect, develop and maintain secure, scalable full stack applications aligned with client and business needs.
• Build & Integrate:
Develop robust REST APIs, microservices and back-end services that enable seamless integration.
• Create & Enhance:
Build and improve responsive user interfaces using modern front-end frameworks.
• Innovate & Modernise:
Develop cloud-native applications leveraging AWS, Azure or Google Cloud Platform.
• Champion Quality:
Embed automated testing, secure coding practices and engineering standards throughout development.
• Collaborate & Influence:
Work closely with multidisciplinary teams and stakeholders to shape technical solutions and deliver successful outcomes.
• Automate & Deploy:
Implement and enhance CI/CD pipelines to support efficient, reliable software delivery.
• Optimise & Improve:
Identify opportunities to enhance application performance, reliability, maintainability and scalability.
• Build, test & maintain: reliable services using automated testing, code…