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 requirements

Mentoring engineers and helping improve DevOps and SRE practices

Essential experience

Strong experience with Linux (Ubuntu) and Windows Server environments

Hands-on scripting skills (Bash, Python, PowerShell or similar)

Proven experience with automation and DevOps tooling (Ansible, Terraform, CI/CD, Git)

Experience working with Azure or similar cloud platforms

Solid understanding of infrastructure reliability, monitoring, and incident response

Strong problem-solving skills and ability to work across multiple priorities

Willingness to work in secure, regulated environments (SC eligibility required)

Desirable experience

Infrastructure-as-Code lifecycle and best practices

Containerisation and orchestration (Docker, Kubernetes)

Configuration management and desired state tooling

Application and platform monitoring tools (Splunk, Nagios or similar)

Experience hardening systems and conducting security assessments

Understanding of Agile and DevOps principles in practice

A collaborative, inclusive culture with strong benefits including competitive pay, bonus, pension, private healthcare, generous leave, professional development, wellbeing perks, and modern on-site facilities.

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