Founding Security Engineer – Equity & CTO Path (London)

Company: Jack & Jill
Apply for the Founding Security Engineer – Equity & CTO Path (London)
Location: London
Job Description:

Jack & Jill, a London-based AI security startup, is seeking the founding security engineer to build core infrastructure for autonomous systems. You will lead secure AI framework development, ensuring integrity and safety across production models, with significant autonomy to shape technical strategy and scale with the company.

As the first security hire, you will have a direct path to CTO as the company grows.

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Posted: July 24th, 2026