Senior Software Engineer in Wideopen

At CGI, we’re 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), you’ll play a pivotal role in designing and delivering modern, accessible front‑end applications using React and contemporary JavaScript frameworks. You’ll 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.

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. 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:

• Design, develop, and maintain modern React-based web applications that power critical UK Government services.
• Build responsive, accessible, and high‑performing user interfaces that integrate seamlessly with secure backend services.
• Contribute across the full development lifecycle, from shaping technical approaches and implementing features through to testing, optimisation, and continuous improvement.
• 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:

• 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. You’ll 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 React.js, 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.

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.

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