Site Reliability / DevOp Engineer London - 5 Days Onsite Up to £550 per day (Umbrella, Inside IR35) 12-Month Contract Must hold live and transferrable DV Clearance Are you passionate about reliability, automation, and supporting mission-critical systems? Join this global defence organisation as a Site Reliability Engineer (SRE) and help shape the future of one of the UK's most vital national security platforms. You'll be joining a growing SRE team at the heart of the customer's mission, focused on ensuring performance, availability, and scalability-while driving continuous improvement and innovation. About the Role As an SRE, you'll combine your operational expertise with software engineering skills to minimise manual effort and drive automation across complex systems. This role is perfect for someone who thrives on solving hard problems, automating the mundane, and building intelligent tools to enhance system reliability. Key Responsibilities Support and maintain essential services behind critical applications. Participate in a 24/7 on-call rota (1 week in 5), with extra allowance and overtime. Proactively enhance system availability, performance, and resilience. Develop tools and solutions to automate repetitive tasks and reduce operational toil. Collaborate with development teams to embed best practices and SRE principles. Deploy and manage monitoring systems to provide intelligent observability. Engage with the wider DevOps/SRE community within the organisation. Ideal Skills & Experience We're more interested in your curiosity, enthusiasm, and problem-solving ability than ticking every box. However, experience in any of the following areas would be advantageous: Software development in web technologies or OOP (e.g., Python, Java, etc.) Database tech: Oracle SQL, PostgreSQL, MongoDB Proficient with Linux/Windows command line (Bash, PowerShell) Monitoring: Grafana, Prometheus, ELK, Splunk Agile working and tooling (e.g., Jira, Confluence) Diagnosing and resolving complex system issues ITIL knowledge or exposure to IT service operations Containerisation: Docker, Kubernetes, OpenShift Awareness of modern tech trends and tooling Security Requirements You must hold live DV clearance to be considered. Why Apply? Join a forward-thinking SRE team in an environment where your work directly supports UK national security. Help shape tooling, practices, and culture from the ground up. Work alongside brilliant minds on meaningful problems. Receive ongoing training and professional development. If you're excited about automation, resilient systems, and the opportunity to work on a high-impact project-this is your chance to make a difference