Senior Full Stack Software Engineer (.NET & TypeScript)

At CGI, you’ll help shape digital services that make a meaningful difference across the UK public sector. As a Senior Software Engineer, you’ll play a key role in enhancing a live, high-profile platform that supports a key regulatory body, delivering innovative solutions that improve user experiences and provide measurable value to our client. Working alongside a collaborative team of experts, you’ll have the opportunity to take ownership of technical delivery, contribute new ideas, and develop modern cloud-native solutions in an environment that supports your growth and recognises the impact you make. 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. Whilst this is a hybrid position it will require you to work on site at our Bristol office 2/3 days a week as required.

Your future duties and responsibilities In this role, you will join a skilled delivery team responsible for enhancing and evolving a live digital service used by our key UK Government Department Client. You’ll develop new functionality, improve existing capabilities, and help deliver frequent, high-quality releases that provide tangible value to users. Working closely with CGI colleagues and client stakeholders, you’ll contribute throughout the software development lifecycle, ensuring solutions are secure, scalable, and aligned with business needs. You’ll have the opportunity to influence technical decisions, share best practice, and contribute to a culture of continuous improvement and collaborative delivery. As a senior member of the team, you’ll take ownership of your work while supporting colleagues and helping drive successful project outcomes. Key responsibilities

• Design & Develop high-quality features using .NET and JavaScript/TypeScript technologies.
• Build & Deliver secure, scalable cloud-native applications hosted on AWS.
• Collaborate & Engage with client stakeholders and multidisciplinary delivery teams.
• Contribute & Improve application architecture, coding standards and engineering best practices.
• Develop & Maintain APIs, backend services and user-facing functionality.
• Support & Optimise CI/CD pipelines using GitHub Actions and modern DevOps practices.
• Work & Innovate within an Agile delivery environment, contributing to sprint planning, reviews and retrospectives.
• Mentor & Share knowledge with colleagues, promoting continuous learning across the team.

To succeed in this role, you’ll bring strong experience developing modern software solutions using Microsoft technologies and JavaScript/TypeScript within Agile delivery teams. You’ll be comfortable working directly with clients, passionate about engineering quality, and motivated by delivering innovative digital services that create lasting business value., * Strong commercial experience developing applications with .NET.

• Excellent JavaScript and/or TypeScript development skills.
• Experience working with MongoDB.
• Experience developing and deploying containerised applications using Docker.
• Knowledge of AWS cloud services.
• Experience building and maintaining CI/CD pipelines using GitHub Actions.
• Strong understanding of Agile software development practices.
• Excellent communication skills with experience working directly with clients.

• Ability to work collaboratively within multidisciplinary engineering teams. Desirable skills

• Jest
• HapiJS
• Kubernetes
• Jenkins
• Handlebars
• Nunjucks
• Node-RED

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.

That same commitment to fairness extends to how we use technology. To support our recruitment team, AI tools may be used to help assess applications though they never replace human judgement. All hiring decisions remain entirely in the hands of our recruitment professionals.

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