Senior Full Stack Developer

CGI; Leeds; On-site; GBP 55,000 - 75,000; Full time

Job summary

A leading IT services company in the UK seeks a Senior Full Stack Developer to help design and deliver scalable cloud-first applications. The ideal candidate will have strong experience in C# / .NET Core, as well as in front-end technologies like JavaScript or TypeScript with React or Angular. Responsibilities include building secure APIs, managing applications on AWS, and refining development practices in a collaborative environment. Competitive salary and excellent benefits are offered to foster professional growth.

Benefits

Competitive salary

Private healthcare

Pension plan

Employee share scheme

Qualifications

• Strong experience delivering full stack solutions in a cloud environment.
• Proven experience with C# .NET / .NET Core and full stack development.
• Hands-on experience deploying applications to AWS.

Responsibilities

• Design & develop scalable web applications using C# / .NET Core.
• Build & optimise secure APIs and back-end services.
• Develop responsive front-end features using JavaScript / TypeScript and frameworks.
• Deploy & manage applications on AWS leveraging containerisation.
• Implement & maintain CI / CD pipelines.

Skills

Application Deployment

Full Stack Development

Tools

Docker

Kubernetes

CI/CD tools

C# / .NET Core

AWS

JavaScript

TypeScript

React

Angular

Job description

Position Description

At CGI youll help design and deliver modern digital solutions that power critical services and enable organisations to thrive in an increasingly connected this role youll shape scalable cloud-first applications that deliver real business outcomes for our clients combining robust engineering with creative problem-solving. Youll 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 youll be part of an open friendly community of experts. Well 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.

Your future duties and responsibilities

In this role you will design build and enhance full stack applications using technologies and contemporary front-end frameworks. Youll 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 youll help shape technical direction while continuously improving how we build and deliver software.

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

Key Responsibilities

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

Required qualifications to be successful in this role

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

Essential qualifications

• Proven experience with C# .NET / .NET Core and full stack development
• Strong front-end experience with JavaScript / TypeScript 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

Skills

• Application Deployment
• Full Stack Development

What you can expect from us

Together as owners lets turn meaningful insights into action.

Life at CGI is rooted in ownership teamwork respect and belonging. Here youll 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. Thats why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our companys strategy and direction.

Your work creates value. Youll 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.

Youll shape your career by joining a company built to grow and last. Youll 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 teamone of the largest IT and business consulting services firms in the world.

Required Experience

Senior IC

Key Skills

• APIs
• REST
• Spring
• SOAP
• .NET
• React
• Node.js
• Angular
• J2EE
• JavaScript
• Web Services
• Java

Employment Type: Full-Time

Experience: years

Vacancy: 1