C# Software Engineer (Security Clearance)

CGI; Leatherhead; Hybrid; GBP 55,000 - 75,000; Full time

Job summary

A global IT solutions provider in Leatherhead is seeking a C# Software Engineer to update and enhance critical systems. This role requires strong C# development, experience with Windows Server and SQL Server, and the ability to work in a DevOps environment. Applicants must hold UK Security Clearance. Competitive benefits including a stake in the company.

Benefits

Competitive salary

Private healthcare

Pension scheme

Share scheme

Qualifications

• Strong background in C# development with Visual Studio.
• Hands-on experience with Windows Server environments.
• Solid experience working with Microsoft SQL Server.
• Ability to understand complex, safety-critical systems.

Responsibilities

• Update and enhance legacy medical software and APIs.
• Develop new modules to support operational requirements.
• Ensure all code is under version control.
• Collaborate with infrastructure and support teams.

Skills

C# development

Visual Studio

Microsoft SQL Server

Agile methodologies

DevOps practices

Configuration control

Tools

Windows Server

SVN

Adobe products

Microsoft Office

Job description

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C# Software Engineer (Security Clearance), Leatherhead

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Client:

CGI

Location:

Leatherhead, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Reference:

876fc80b2c49

Job Views:

15

Posted:

12.08.2025

Expiry Date:

26.09.2025

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Job Description:

Position Description:

The Space, Defence and Intelligence business unit in CGI is a true IT Systems Integrator. We work, build, and operate bespoke, technically complex, mission-critical systems which help our clients keep us all safe and secure. We bring innovation to our clients using proven and emerging technologies, agile delivery processes and our deep expertise across the breadth of space, defence, intelligence, aerospace and maritime, all underpinned by our end-to-end cyber capability. We work collaboratively with global technology companies, cutting edge SMEs and academia to deliver the optimal solution for each client.

CGI was recognised in the Sunday Times Best Places to Work List and has been named one of the ‘World’s Best Employers’ by Forbes magazine. 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 position will be a hybrid position, working out of our site in Leatherhead or Reading.

Your future duties and responsibilities:

Our system is a mix of hosted and remote-deployed environments across various sites worldwide. We are transitioning to a new platform built on Azure local with Windows Server , and Microsoft SQL Server , supporting bespoke COTS medical software and infrastructure.

Our client now wants to integrate some new (separate) capabilities with our existing platforms and services. This will require the update and improvement to a series of API interfaces to allow the client to operate an ecosystem of medical capabilities.

As a C# Developer, you will play a critical role in updating our current systems and APIs to allow the movement of data between our systems and the new client systems.
You will work within a DevOps environment to uplift existing software, develop new modules, and support tightly integrated COTS and infrastructure components including Microsoft Office, Adobe Reader, and peripheral hardware like printers and scanners.

You will contribute to system improvement while ensuring all changes align with Quality of Service and SLA expectations. Your input into process optimisation, testing, and system configuration will be highly valued.

Key Responsibilities:

• Uplift and enhance the legacy medical software (including APIs) to align with modern standards.

• Develop new features/modules where required to support operational requirements.

• Ensure all code is placed under version control and adheres to best practices.

• Write and execute unit tests; collaborate with QA to refine system testing.

• Support build, configuration, and deployment of operating system images.

• Collaborate with infrastructure and support teams to address system-wide enhancements.

Required qualifications to be successful in this role:

• Strong background in C# development with Visual Studio and git.

• Hands-on experience with Windows Server and above environments.

• Solid experience working with Microsoft SQL Server and above.

• Familiarity with COTS integration, especially Microsoft Office and Adobe products.

• Configuration control experience using SVN or similar tools.

• Ability to understand and navigate complex, safety-critical systems.

• Exposure to Agile (SAFe) methodologies and DevOps practices.

Desirable Experience:

• Operating system and application security hardening techniques.

• Active Directory and Group Policy Object (GPO) configuration.

• Security and compliance tooling such as Nessus.

• Knowledge of UPS systems and their interaction with Windows.

• Experience building and deploying custom OS images (ISOs).

• Familiarity with Bugzilla for issue tracking and management.

• Exposure to Ansible, Jenkins and RunDeck

• Exposure to Microsoft COM/COM+ based technologies


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