Senior Cyber Security Engineer – Purple Team Lead

Company: Careers at MI5, MI6 and GCHQ
Apply for the Senior Cyber Security Engineer – Purple Team Lead
Location: London
Job Description:

MI5 is seeking a Senior Cyber Security Engineer to protect our digital products, embedding security from design through delivery. You will work with engineers, architects and stakeholders to identify risks and shape secure, resilient systems from the outset.

The role emphasizes threat modelling, vulnerability assessment and security testing, with opportunities to mentor colleagues and influence security practices across the organisation.

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Posted: July 26th, 2026