Network Security Architect (SC Cleared) - Advisory & Assurance

We are seeking an experienced Network Security Architect to strengthen the network security advisory and assurance capability of a critical national infrastructure organisation. These roles sit at the intersection of engineering, architecture and risk, providing practical security guidance to delivery teams as they design and implement new solutions. You will be Embedded into live delivery workstreams, reviewing designs, performing threat modelling, assessing risk, and helping teams make secure, pragmatic decisions at pace.

Responsibilities:

• Act as a security advisor to engineering and architecture teams across live initiatives
• Review solution designs and architectures from a security perspective
• Perform threat modelling, risk assessments and security design reviews
• Provide pragmatic guidance that balances security, delivery velocity and business outcomes
• Identify and articulate security risks in a clear, proportionate way
• Support teams in remediating security gaps and weaknesses
• Contribute to the development of lightweight security patterns, standards and documentation
• Operate as part of an assurance function rather than owning end-to-end solution design

Required Experience:

• Proven background as a Security Architect in complex environments
• Strong understanding of modern application, infrastructure and cloud architectures
• Experience conducting design reviews, threat modelling and security assessments
• Ability to engage constructively with architects, engineers and product teams
• Comfortable working in evolving, imperfect environments
• Pragmatic mindset
• Strong communication skills - able to explain risk and trade-offs clearly

Desirable:

• Experience in cloud security (AWS preferred)
• Exposure to regulated or large-scale enterprise environments
• Familiarity with Zero Trust, IAM, network segmentation, and modern security patterns