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.
Founding Head of Public Sector at Cosine.sh
Cosine.sh is a YC-backed UK frontier AI lab for autonomous software engineering, recently selected for the UK’s sovereign AI programme alongside BAE Systems and the Alan Turing Institute. As the Founding Head of Public Sector, you will own the go-to-market strategy for the UK government, defense, and national security sectors. This is a rare opportunity to shape how secure, autonomous AI is deployed in mission-critical, high-trust environments. You will build deep institutional relationships, navigate complex procurement routes, and scale a high-impact vertical from the ground up within an elite, deep-tech team.
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Location
London, United Kingdom
Compensation
Not Disclosed
Company
Cosine
Role overview
Software
Cosine is an autonomous, on-premise coding agent post-trained on human reasoning data to deliver unmatched software-engineering accuracy, security, and speed for regulated enterprises.
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.
Who this is a fit for
- 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.
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.
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.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
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 your profile’s a match and Cosine wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.