Overview
At CGI, you'll play a pivotal role in building and sustaining secure, high-impact applications that underpin critical services for our clients. As a C# Developer, you'll contribute to the full application lifecycle, combining hands-on development with 4th line support to ensure resilient, high-performing systems. Working within a collaborative, ownership-driven culture, you'll help deliver measurable outcomes, strengthen long-term client relationships, and shape solutions that make a real difference in a highly secure environment. In this role, you will develop, maintain, and support a secure application using C#, ASP.NET, and SQL Server, taking ownership of both new functionality and the stability of a mature system. You'll work closely with colleagues and, where appropriate, directly with the client, building trust through clear technical communication and reliable delivery. Supported by experienced peers, you'll grow into a trusted technical authority and subject matter expert for the customer environment. You will contribute to continuous improvement by applying strong software development practices, diagnosing complex issues, and ensuring solutions meet the highest security and quality standards.
Responsibilities
* Develop & enhance secure applications using C# and ASP.NET
* Support & resolve complex 4th line application issues
* Analyse, debug, and improve mature production systems
* Manage code and work items using Azure DevOps
* Collaborate with stakeholders and communicate technical solutions clearly
* Contribute to best practice within a highly secure delivery environment
* Adapt to evolving security and quality standards in a regulated setting
Essential Qualifications
* Strong experience with C# and ASP.NET
* Proven experience using SQL Server
* Familiarity with the Microsoft development toolchain
* Good understanding of modern software development practices
* Experience supporting and debugging mature applications
* Ability to work effectively in a secure environment
* Clear and confident technical communication skills
About CGI and Benefits
Life at CGI is rooted in ownership, teamwork, respect and belonging. You are invited to be an owner from day 1, and we operate as CGI Partners rather than employees. We offer a competitive salary, pension, private healthcare, and a range of benefits. This is a full-time onsite position based in our Reading office. UK sole nationality is required.
Benefits: Insurance coverage, Medical benefits, Pension plan, Flexible time off, Share Purchase Plan, Dental benefits, Vision benefits, Health and Wellbeing Programme, and more.
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