Site Reliability Engineer (SRE) - Defence / National Security - £75k - Farnborough - Hybrid A permanent opportunity for an experienced Site Reliability Engineer who enjoys building secure, automated, and highly reliable platforms. This role sits within a defence and national security environment, working on modern infrastructure where automation, resilience, and secure-by-design principles are fundamental. You'll work closely with platform engineers, infrastructure teams, and operational stakeholders to take requirements from early design and proof-of-concept through to production. The role blends hands-on engineering with technical design, offering real influence over tooling, standards, and DevOps ways of working. It suits someone curious, detail-oriented, and comfortable working in complex, regulated environments. What you'll be doing Designing, delivering, upgrading, and maintaining core platforms, services, and automations Building and improving monitoring, alerting, and observability platforms Designing secure infrastructure using automation-first approaches Creating and productionising proofs of concept for new tools and technologies Diagnosing and resolving performance, reliability, and availability issues Supporting architecture, documentation, and non-functional requi...