Jack & Jill
Founding Head of Public Sector at Cosine.sh
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Job Title
Founding Head of Public Sector
Salary
Not Disclosed
Company Description
Cosine.sh is a YC-backed UK frontier AI lab for autonomous software engineering that was recently selected for the UK’s sovereign AI programme alongside partners like BAE Systems, Babcock, and the Alan Turing Institute.
Job Description
You will lead Cosine.sh's public sector GTM strategy, transforming deep technical innovation into a repeatable commercial engine. As a founding leader, you'll navigate complex procurement routes, build high-trust relationships within UK government and defense, and scale a vertical that deploys secure, autonomous AI engineering inside high-trust, security-critical environments.
Location
London, UK
Why this role is remarkable
- Direct participation in the UK's sovereign AI programme, Lumen Sovereign, working alongside giants like BAE Systems, Thales UK, and the Alan Turing Institute.
- A founding-level leadership position where you shape the GTM playbook for security-critical AI deployment in government, defense, and national security sectors.
- Exceptional technical leverage—selling proprietary models and an agent stack designed for air-gapped and on-premise environments where generic AI assistants cannot operate.
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What You Will Do
- Own and execute the end-to-end engagement strategy for central government departments, defense-adjacent bodies, and national infrastructure organizations.
- Build multi-threaded relationships with CIOs, CDIOs, and security stakeholders to move from general AI interest to specific, high-value commercial opportunities.
- Collaborate with elite systems integrators and delivery partners to navigate procurement frameworks and secure inclusion in large-scale public sector transformation programs.
The ideal candidate
- Proven experience building public-sector GTM motions at high-growth UK tech scale-ups or leading government-focused sales at major global consultancies.
- Deep understanding of UK public sector procurement, framework dynamics, and the specific security constraints of defense and national security environments.
- A builder mindset capable of hands-on deal execution while simultaneously designing the long-term strategy and recruitment plan for the public sector vertical.
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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Jessica, London
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