Jack & Jill
Founding CTO (+ Equity) at VC-backed AI security startup
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Founding CTO
Salary
Not Disclosed + Equity
Company Description
VC-backed AI security startup
Job Description
Join a well-funded startup as Founding CTO to build advanced ML/AI systems for automated security research and threat detection. You will design agentic risk management platforms that reason about complex adversary behavior in real time. This is a ground-floor opportunity to own the technical roadmap and shape the engineering culture from day zero.
Location
London, UK
Why this role is remarkable
- True co-founder status with significant equity ownership and the ability to define the core technology and product strategy.
- Work alongside an experienced founder with deep enterprise deployment history, ensuring the product addresses real-world security challenges.
- Tackle high-impact problems by building agentic AI systems that move beyond pattern matching to sophisticated, context-aware reasoning.
What You Will Do
- Lead the design and implementation of the core ML/AI architecture, building high-performance systems capable of real-time threat modeling.
- Act as the primary technical contributor, writing production-grade code while setting long-term engineering standards and culture.
- Translate complex security research and adversary behaviors into scalable AI agents that help enterprise teams manage risk more effectively.
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The ideal candidate
- Possesses deep ML/AI research credibility, typically demonstrated via a PhD or significant tenure at top-tier research labs.
- Demonstrates a strong desire to transition from research to building, with the technical breadth to own an early-stage startup stack.
- Has a background or strong interest in applying advanced machine learning to cybersecurity challenges like threat detection and risk modeling.
Who are Jack & Jill?
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.
And I'm Jill
Get help with your application
Your very own career expert that helps elevate your application to the next level.
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.
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.
We never post fake jobs
This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't much we can do about it.
Give Jack a spin! You could land this role.
If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
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