Security Engineer

In this role, you will take ownership of platform security for a highly secure, on-site client environment. You will work hands-on across endpoint protection, vulnerability management, system hardening, and compliance, ensuring the platform meets stringent security and assurance standards. Collaborating closely with DevOps and Platform Engineering teams, you will help embed security into day-to-day operations, balancing resilience, usability, and innovation.

You will act as a trusted security authority, confidently communicating risk and progress to stakeholders, while being supported by experienced colleagues and proven delivery frameworks that enable you to do your best work.

Key responsibilities include:

Lead & Protect: Operate and manage endpoint protection tooling, monitoring alerts and responding to security incidents.

Assess & Remediate: Run vulnerability scans, prioritise risks, coordinate fixes, and validate remediation outcomes.

Harden & Secure: Enforce secure baseline configurations and reduce configuration drift across systems.

Assure & Comply: Support audits, maintain evidence, and track compliance against recognised security frameworks.

Report & Influence: Produce clear security reports and provide actionable recommendations to stakeholders.

Automate & Improve: Embed security into CI/CD pipelines and automate patching and compliance checks where possible.

You will bring strong experience operating as a security or DevSecOps engineer within highly secure environments, with the confidence to take ownership of security outcomes while working collaboratively across teams. You should be comfortable operating hands-on, balancing technical depth with clear communication.

You should have:

Extensive experience in security engineering, DevSecOps, or platform security roles.

Strong hands-on expertise with enterprise endpoint protection solutions and vulnerability management tooling.

Proven experience using Tenable Nessus Agent for scanning, assessment, and remediation workflows.

Solid background in Windows system hardening and secure configuration.

Experience supporting audits and working with security frameworks such as ISO 27001, NIST, or CIS.

The ability to communicate security risk effectively to both technical and non-technical audiences.

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.

At CGI, you'll play a pivotal role in safeguarding a highly secure platform that underpins critical client operations. As a senior security professional, you'll help shape resilient, compliant environments where robust engineering and smart automation protect what matters most. Working at the forefront of cyber security, you'll influence outcomes, strengthen trust, and enable innovation across complex, mission-critical systems. We empower our people to take ownership, think creatively about security challenges, and thrive within a supportive, collaborative culture-giving you the space to make a meaningful, lasting impact while advancing your career., 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