Site Reliability Engineers (DV Security Clearance)

We are seeking experienced Site Reliability Engineers to join our cross-functional teams supporting secure, cloud-based and big-data platforms. Working closely with clients and internal delivery teams, you will help design, build, operate, and continuously improve highly reliable, scalable systems within a secure environment.

Due to the nature of the work, this role requires onsite attendance and applicants must be solely UK Nationals (not dual nationals and not visa holders) with existing HMG DV / HLC clearance.

Your future duties and responsibilities Architect, build and operate cloud infrastructure Design and deliver secure, scalable, fault-tolerant infrastructure across AWS (and potentially Azure/GCP), optimised for performance, availability, and cost.

Support and operate live systems Maintain deployment environments, support production systems, and manage changes to live services in mission-critical environments.

You will work with a modern and diverse technology stack, including:

Languages & Scripting: Java, Python, Go, JavaScript (TypeScript), Bash

Frontend: Vue

CI/CD & Automation: Jenkins, GitLab CI, Ansible, Cucumber

Cloud & Platforms: AWS, OpenShift, Linux

Infrastructure as Code: Terraform

Data & Streaming: Apache NiFi

Monitoring & Logging: Grafana, ELK Stack, SonarQube

Version Control: GitLab Automation & Infrastructure as Code (IaC) Automate infrastructure provisioning, configuration, and CI/CD pipelines using Terraform, Ansible, CloudFormation, and scripting languages.

CI/CD & Platform Engineering Build, maintain, and improve CI/CD pipelines using Jenkins, GitLab CI/CD, and related tooling.

Monitoring, reliability & optimisation Implement and manage monitoring, logging, alerting, and performance optimisation using tools such as Grafana, ELK Stack, CloudWatch, Prometheus, and SonarQube.

Security & compliance Implement IAM, encryption, network controls, and secure configurations in line with government and industry standards (e.g. GDPR, ISO 27001).

Disaster recovery & resilience Design and test backup, disaster recovery, and self-healing strategies to ensure system reliability and availability.

Collaboration & documentation Work closely with development, DevOps, security, and operations teams; produce runbooks, architecture documentation, and knowledge-sharing materials.

Proven experience as a Site Reliability Engineer, DevOps Engineer, or similar role supporting cloud-based or secure systems

Strong automation and scripting skills (Python, Bash, Go, or similar)

Hands-on experience with CI/CD pipelines (Jenkins, GitLab CI/CD, etc.)

Strong knowledge of Infrastructure as Code (Terraform, CloudFormation, Ansible)

Solid understanding of AWS and cloud-native architectures

Experience with Linux-based environments and production troubleshooting

Familiarity with containerisation and orchestration (OpenShift or Kubernetes)

Experience with monitoring, logging, and observability tools

Comfortable supporting live services in production environments

Strong communication skills and a proactive, problem-solving mindset

Together, as owners, let's turn meaningful insights into action.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and named one of the World's Best Employers by Forbes. We offer a competitive salary, excellent pension, private healthcare, and a share scheme (3.5% + 3.5% matching), making you a CGI Partner rather than just an employee. We are committed to inclusivity and building a genuinely diverse community of technology professionals.

CGI's Space, Defence and Intelligence business unit delivers innovative, mission-critical solutions to some of the UK government's most complex and challenging problems. We design, build, and operate bespoke, secure systems that help keep the nation safe and secure. Our work spans cloud, on-prem, and hybrid environments, underpinned by strong cyber and engineering best practices.

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.