Jack & Jill
Founding Sales Lead - Cybersecurity and Red Teaming (+ Equity) at Cosine.sh
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Job Title
Founding Sales Lead - Cybersecurity and Red Teaming
Salary
Not Disclosed + Equity
Company Description
Cosine.sh is Britain’s sovereign frontier AI lab, known as The Sovereign AI Lab. They build the Lumen family of specialist models (Scout, Outpost, Sovereign) designed to write exceptional software. Their flagship, Lumen Sovereign, is Britain's first sovereign frontier AI model, trained on UK sovereign compute to run within secure, air-gapped customer infrastructure.
Job Description
You will lead the cybersecurity go-to-market strategy for Lumen Sovereign, driving adoption for AI-native red teaming and code review. Working directly with the founders and CCO, you’ll sell to elite security teams at banks, defense organizations, and critical infrastructure providers. This is a high-impact role converting national momentum into a durable commercial motion.
Location
London, UK
Why this role is remarkable
- Own the commercial launch of Britain's first sovereign frontier AI model, targeting high-consequence markets like national defense and global banking.
- Work within a lab that has garnered significant national press and a coalition of partners across telecoms and finance since its London Tech Week debut.
- Secure founding-stage equity in a technically serious team where specialist AI models are already outperforming generalist alternatives in complex engineering domains.
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What You Will Do
- Build the end-to-end sales motion for cybersecurity applications, selling directly to CISOs and security teams at major financial and critical infrastructure institutions.
- Establish and manage strategic partnerships with cybersecurity firms to build specialized harnesses and integrations on top of the Lumen Sovereign model.
- Lead high-level technical discovery and negotiations with engineering leaders, managing complex sales cycles without the need for a dedicated solutions architect.
The ideal candidate
- Possesses a former founder’s DNA or early startup experience, with a proven track record of building technical sales motions from the ground up.
- Demonstrates extensive experience selling deeply technical products such as AI infrastructure, developer tools, or cybersecurity solutions to enterprise-level customers.
- Capable of commanding a room of engineers and executive stakeholders, effectively communicating the depth and security advantages of sovereign AI models.
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.
Get help with your application
Your very own career expert that helps elevate your application to the next level.
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.
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.
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