Senior Software Engineer (React)

Position Description:

At CGI were shaping the future of digital UK Government services by building secure user-centred platforms that improve experiences for millions across the UK. As a Senior Software Engineer (React) youll play a pivotal role in designing and delivering modern accessible front-end applications using React and contemporary JavaScript frameworks. Youll collaborate with talented professionals who take ownership of their work share ideas openly and are empowered to create intuitive digital experiences that make a real difference. This is an opportunity to contribute to impactful public sector programmes where innovation collaboration and continuous learning come together to deliver meaningful outcomes.

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. These roles will be predominately hybrid with some work based in UK CGI or client offices depending on the specific programme. Travel away from base office will be expensed.

Your future duties and responsibilities:

In this role you will design develop and maintain modern React-based web applications that power critical UK Government services. Working within a collaborative cross-functional agile team you will build responsive accessible and high-performing user interfaces that integrate seamlessly with secure backend services. You will contribute across the full development lifecycle from shaping technical approaches and implementing features through to testing optimisation and continuous improvement.

You will be encouraged to take ownership of front-end engineering decisions contribute creative ideas to improve usability and performance and work closely with designers backend engineers and architects to deliver scalable digital platforms that provide real value to users.

Key responsibilities include:

Develop & Deliver: Build modern responsive user interfaces using React JavaScript (ES6) HTML5 and CSS3
Design & Enhance: Develop reusable components and scalable front-end architecture using React ecosystem tools such as Redux or similar state management libraries
Collaborate & Integrate: Work closely with UX designers backend engineers and architects to integrate front-end solutions with secure APIs and microservices
Optimise & Improve: Enhance application performance accessibility and usability through testing profiling and continuous refinement
Contribute & Support: Participate in agile ceremonies share knowledge across the team and help maintain a culture of quality and collaboration
Secure & Maintain: Ensure front-end solutions meet accessibility performance and security standards expected within government platforms

Required qualifications to be successful in this role:

You should have strong experience developing modern front-end applications using React and the wider JavaScript ecosystem alongside a solid understanding of scalable web application architecture. Youll bring a collaborative approach strong problem-solving skills and a passion for delivering high-quality digital experiences.

Proven experience as a Senior Software Engineer Frontend Engineer or React Developer
Strong proficiency in JavaScript (ES6) HTML5 and CSS3
Experience with state management libraries such as Redux or similar
Strong understanding of component-based architecture and modern front-end development practices
Experience integrating RESTful APIs and working with backend microservices
Familiarity with CI/CD pipelines Git workflows and Agile delivery environments
Understanding of performance optimisation responsive design and accessibility standards (WCAG)
Exposure to cloud platforms (AWS Azure or GCP) and DevOps practices is beneficial

#LI-JW1

Skills:

• Data Analysis
• RESTful (Rest-APIs)

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.