Application Security ArchitectOnsite in BracknellEligible for DV clearance£65-70k per annum + benefits packageWe are seeking an experienced Security Application Architect to support the delivery and ongoing evolution of a secure Gateway capability for a strategic UK defence customer. This role combines architectural ownership, secure design governance, and operational assurance within a high-security, mission-critical environment. You''ll shape technical direction, drive change, and ensure resilient, compliant solution delivery across engineering and support teams.What you''ll be doing;Own and design technical changes required to maintain and enhance Gateway capabilityProduce high-quality design documentation in collaboration with the customer and Programme ManagerSupport solution governance and architectural integrityAssist in maintaining secure, resilient and scalable infrastructure components across Windows and Linux environmentsSupport monitoring and investigation of communications platforms such as email and XMPP-based chat, including the ability to review underlying conversation data where required for security analysisContribute to file validation and inspection processes, ensuring transferred files conform to expected formats and security controlsYour technical background;Core InfrastructureVMware/vSphereRHEL andamp; Windows ServerMicrosoft ServicesActive Directory, including Group Policy (GPO), DNS integration, LDAP directory structures, and directory management/main