Security Engineer (£110k-£200k + Equity) at $100M Series B AI a confidential company response p[…]

Job Title

Security Engineer

Salary

£110k-£200k + Equity

Company Description

$100M Series B London AI a confidential company response platform backed by Index Ventures and Insight Partners

Job Description

Join a high-growth scale-up as their first Security Engineer, owning application security across a 60+ person engineering team. You will partner with product squads to build secure systems from the ground up for a platform used by Netflix, Airbnb, and Block. This is a foundational role with massive ownership and technical influence.

Location

London, UK

Why this role is remarkable

• Foundational hire opportunity: As the first security-specific engineer, you will shape the entire security culture and function from day one without legacy debt.
• Elite backing and traction: Backed by Index Ventures and Insight Partners with $100M raised, serving 1,500+ top-tier tech companies globally.
• Product-driven engineering: Work in a high-trust, ex-Monzo leadership environment that values shipping daily and uses a modern Go and TypeScript stack.

What You Will Do

• Lead application security by partnering with product teams to design and review features with security built in from the initial architecture phase.
• Identify and remediate vulnerabilities using both white-box code reviews and black-box penetration testing across applications, APIs, and GCP infrastructure.
• Build and implement pragmatic security tooling and automation that strengthens defenses without compromising the engineering team’s high shipping velocity.

The ideal candidate

• Senior or Staff-level experience with a deep track record in vulnerability research, penetration testing, and secure code review for modern web stacks.
• Hands-on proficiency in Go, TypeScript, or React, with the ability to influence design and implementation decisions directly alongside product engineers.
• Pragmatic approach to risk management within cloud environments (GCP), prioritizing high-impact security improvements while maintaining a culture of rapid delivery.

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