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.
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London, United Kingdom£110k-£200k + Equity
Security Engineer at $100M Series B AI incident response platform
Join one of London’s fastest-growing startups as their first Security Engineer. Backed by $100M from Index Ventures and Insight Partners, this Series B platform is the leading AI-driven incident response tool used by Netflix, Airbnb, and Block. You’ll have a blank canvas to build the security function from scratch, working alongside an elite engineering team led by ex-Monzo founders. If you’re a senior IC who thrives on application security and wants to own the strategy for a platform managing over 500,000 incidents globally, this foundational role offers a market-leading salary, meaningful equity, and the chance to define security for a category-defining product.
Overview
Role overview
Company
Incident
Software
$100M Series B London AI incident response platform backed by Index Ventures and Insight Partners
Responsibilities
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.
Candidate profile
Who this is a fit for
- 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.
What makes it remarkable
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.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 14 million jobs daily and introduces you directly to hiring managers.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
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