Role: Site Reliability Engineer Location: Manchester (on-site / secure environments) Clearance: SC required | DV preferred Employment: Permanent or Contract Salary/Rate: Competitive project allowances (DOE) Overview We are seeking a Site Reliability Engineer (SRE) to support mission-critical platforms within a secure, high-assurance environment. This role focuses on reliability, scalability, automation, and operational resilience across complex infrastructure and cloud-enabled services. You will work within a collaborative engineering team ensuring systems remain secure, performant, and highly available to support critical national infrastructure and defence programmes. Key Responsibilities Maintain and improve reliability, availability, and performance of critical services Implement monitoring, alerting, and observability solutions Automate infrastructure provisioning and operational workflows Support incident response, root cause analysis, and post-incident reviews Improve system resilience through fault tolerance and self-healing design Collaborate with DevOps, platform, and security teams to enhance service stability Maintain documentation, runbooks, and operational procedures Ensure systems meet security and compliance requirements Technical Environment Candidates should have experience across several of the following: Infrastructure & Cloud Linux systems administration AWS, Azure, or private cloud environments Virtualisation and container platforms Automation & Infrastructure as Code Terraform, Ansible, Puppet, or similar CI/CD tooling (GitLab CI, Jenkins, Azure DevOps) Containers & Orchestration Docker & Kubernetes Container security & runtime reliability Observability & Monitoring Prometheus, Grafana, ELK stack, Splunk, or similar Logging, metrics, tracing & alerting strategies Reliability & Performance High availability design & scaling strategies Load balancing & traffic management Performance tuning & capacity planning Essential Requirements Active SC clearance (minimum) or eligibility DV clearance highly desirable Experience supporting production environments in secure or regulated sectors Strong troubleshooting and incident management skills Ability to work on-site within secure facilities Desirable Experience Experience in defence, government, or critical infrastructure environments Knowledge of security hardening & compliance frameworks Scripting skills (Python, Bash, PowerShell) Understanding of Zero Trust and secure architecture principles Why Join? Work on nationally significant, high-impact programmes Access to complex engineering challenges in secure environments Collaborative teams focused on engineering excellence Long-term programme stability and career development Apply now to support secure, mission-critical systems that underpin national capability.