Salary: £33,000 - 60,000 per year Requirements: 3–7 years hands-on experience in IT, cloud infrastructure, and security with potential to grow into security leadership Experience administering cloud environments (AWS, potentially Azure/hybrid/local/others) Experience with Microsoft 365, Google Workspace, Docker, Slack, VMs, AI LLM tools Experience with security frameworks such as ISO27001, NIST Experience managing Linux, Windows, MacOS environments using endpoint management tools such as Intune Experience with networking tools such as Cloudflare, Unifi or Cisco Experience with Defender XDR, Microsoft Purview, Sentinel or similar cyber data security tools Competency in incident response, investigation, vulnerability remediation Ability to obtain and maintain UK Security Check clearance Willingness to work on-site 4 days per week Alignment with our ways of working: clear & concise communication; structured thinking; high organisation; commercial awareness; growth mindset and positive energy. Responsibilities: Implement and maintain secure, scalable IT and cloud infrastructure Support rollout of Microsoft security ecosystem (Defender, Intune, Entra, Purview, etc.) Configure and maintain identity, access control, and endpoint security Improve logging, monitoring, and alerting capabilities Support implementation of Cyber Essentials Plus, ISO27001-aligned controls, and Defence security requirements Help maintain diverse assets globally (Linux, Windows, Mac), security control policies and procedures, continuous security improvements Administer and support Microsoft 365, Google Workspace, cloud infrastructure (AWS/Azure), internal tools (Slack, Docker, etc.) Provide incident response, troubleshooting, and technical service delivery Work with engineering teams to deliver secure development environments, AI/embedded device security, secure lab, and flight trials environments Technologies: AI AWS Azure Cloud Cisco Docker Embedded Support LLM Linux macOS Microsoft 365 Security Slack Windows Office 365 CTO DevOps IoT More: We are a growing defence AI company located in central Oxford, dedicated to developing and delivering mission-critical uncrewed aircraft subsystems. By joining us as a Security & Infrastructure Engineer, you will have the opportunity to make a measurable difference in a fast-paced environment, working alongside a world-class team. We offer a supportive culture, merit-based compensation, 25 days holiday plus UK bank holidays, medical insurance, and various perks. Our commitment to growth and the creation of cutting-edge technology makes this role a unique opportunity for professionals who thrive in dynamic settings. last updated 18 week of 2026