Job Vacancy Application Architect (.NET / ASP.NET)

London

CGI

Job position Application Architect (.NET / ASP.NET)

Permanent

As soon as possible

London, England, United Kingdom

Published on 01/04/2026

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At CGI, we deliver innovative, high-impact solutions that transform how organisations operate in complex, mission-critical environments. As an Application Architect, you will play a pivotal role in shaping scalable, resilient systems that drive measurable outcomes for our clients. Working at the forefront of modern architecture, you will influence design decisions, guide Agile teams, and ensure the delivery of high-quality applications that support long-term business success. You’ll be empowered to take ownership of technical direction, contribute creative solutions, and collaborate within a supportive environment that values expertise, growth, and continuous improvement.

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. This is a hybrid position but you will need to work at client sites in London at least 3 days a week.

Candidate profile

In this role, you will shape and govern application architecture across a complex enterprise environment, ensuring solutions are scalable, secure, and aligned to business objectives. You will evaluate new feature requests, produce high-quality designs, and provide technical leadership to Agile delivery teams, enabling consistent, high-performing outcomes. Working closely with stakeholders, you will translate technical concepts into clear guidance, ensuring alignment across both technical and non-technical audiences.

You will also take ownership of improving live services, supporting incident investigations and root cause analysis, while driving continuous improvements to enhance stability, resilience, and performance. You’ll collaborate across teams to reduce operational overhead, optimise systems, and ensure architectural best practices are embedded throughout delivery.

• Lead & govern application architecture across multiple Agile teams

• Design & deliver scalable solutions across monolithic and microservices environments

• Guide & support teams with technical direction and design assurance

• Evaluate & define solutions for new application feature requests

• Troubleshoot & resolve complex incidents and performance issues

• Improve & optimise system resilience, stability, and efficiency

• Collaborate & communicate effectively with technical and non-technical stakeholders

Required qualifications to be successful in this role

To succeed in this role, you will bring strong expertise in application and solution architecture within complex environments, alongside a deep understanding of Microsoft-based technologies and modern web architectures. You will be comfortable working across varied systems, supporting Agile delivery, and driving technical excellence through clear communication and collaboration.

• You should have strong experience in Application/Solution Architecture

• Expert proficiency in ASP.NET, .NET, C#, VB.NET, JavaScript

• Proven experience working with web services and distributed systems

• Strong understanding of microservices and monolithic architectures

• Experience with Agile delivery tools (Jira, Confluence)

• Knowledge of IIS, Windows Server, Active Directory, and networking concepts

• Experience in live service support, incident investigation, and root cause analysis

• Desirable: Node.js, GraphQL, Adobe Experience Manager, MySQL, JBOSS, Oracle

• Excellent communication skills with the ability to engage diverse stakeholders

• Must hold or be eligible for SC clearance

#LI-JW1

Working environment

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.

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

Discover CGI

London, England, United Kingdom

> 1000 employees

IT services

We are a global business with 91,500 professionals across hundreds of locations worldwide, providing end-to-end IT and business process services that drive our clients’ businesses. In the UK alone, we have around 6,000 member-partners working across 19 towns and cities, doing everything from writing complex code to designing sophisticated software solutions. The work we do powers some of the most ambitious projects that touch the lives of many. Our approach sets us apart, characterised by our proximity model, international presence, expertise, and operational excellence. We organise our operations within metro markets where our clients have concentrated footprints, empowering our local teams to build trusted, in-person relationships. As you build your career here, you’ll develop your skills, share your insights, and work side-by-side with colleagues and clients on innovative solutions that address the most complex issues. Our commitment to ownership, flexibility, and being approachable makes us easy to do business with. Join us, and together, as owners, let’s turn meaningful insights into action to meet the needs and balance the interests of our clients, shareholders, communities, and each other. Benefits: - Insurance coverage - Medical benefits - Pension plan - Member Assistant Programme - Check4Cancer - Flexible time off - Share Purchase Plan - Member discounts - Dental benefits - Vision benefits - Profit Participation Plan - Health and Wellbeing Programme

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Application Architect (.NET / ASP.NET)

CGI