Foundational Security Engineer: Build Secure Apps + Equity
Company: Jack & Jill/External ATS
Location: London
Posted: April 20th, 2026
A high-growth startup in London is seeking a Security Engineer to lead application security for its product team. The role involves designing secure systems, identifying vulnerabilities, and building the security function from scratch. The ideal candidate will have extensive experience in application security and modern web technologies, fostering a collaborative approach within product teams. The position offers the chance to shape the security culture in a rapidly evolving company that values engineering excellence.
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