Security Design Engineer

Join a high-impact engineering team delivering a secure Gateway solution for a major UK defence customer. This is a hands-on Security Application Architect role where you'll design, implement and troubleshoot mission-critical infrastructure in a live, security-sensitive environment. Working alongside senior architects and engineering leads, you'll play a key role in maintaining availability, supporting operational teams, and driving technical change across complex systems. What You'll Be Doing

• Identify and implement infrastructure and application changes to support Gateway functionality and availability

• Produce detailed technical designs for change alongside the customer and Programme Manager

• Work daily with the Solution Owner and Engineering Lead to deliver engineering outcomes

• Provide technical support to SOC and 3rd Line teams, troubleshooting complex incidents

• Configure and support Gateway appliances and associated software

• Maintain high availability, resilience and security posture Your Technical Background You'll bring strong hands-on experience across: Infrastructure

• VMware / vSphere

• RHEL & Windows Server

• Trellix

• SIEM platforms Linux & Scripting

• Shell scripting

• REGEX

• Firewall configuration Microsoft Stack

• Active Directory

• DNS

• RDS Applications & Protocols

• LDAP

• Email, Chat & File standards

• Web & Chat protocols

• XML & JSON schema

• LDIF

• TLS server/client certificates

• File type digital formats Gateways

• Deployment, configuration and support of Gateway appliances and their software

• A self-starter comfortable working independently and collaboratively
• Strong troubleshooting mindset
• Clear written and verbal communication skills
• Comfortable interacting with stakeholders at all levels
• Willing and able to travel weekly within the South / Southwest at short notice

£50-55K per annum + benefits package