Defence Account Director

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About the role

Job Title: Defence Account Director Location: London; full in-office working as default Start date: ASAP Reports to: CCO Compensation: Salary and Equity options available for discussion Clearance: Must be eligible to hold UK Security Vetting Clearance SC or above (no prior clearance required) Application deadline: 01/11/26 at 23:59 UK time ___________________________________________________________________________ Help make sovereign AI operational for UK Defence Cosine is a UK AI lab building models, applications and infrastructure for mission-critical organisations. We build coding agents, specialised Lumen models, AI-native security products and the infrastructure required to deploy advanced AI in demanding environments. We are also training Lumen Sovereign, the first frontier large language model trained in the UK, with the support of the UK Government. Defence is a strategic priority for Cosine. AI will change how Defence operates, from software engineering and intelligence analysis to cyber security, command and control, logistics and frontline operations. The challenge is turning advanced AI into capability that is trusted, secure, sovereign and useful in the real world. We are looking for a Defence Account Director to help build that business. This is not a traditional defence sales role. You will understand where Cosine can make a genuine operational difference, identify the right customers and programmes, shape credible opportunities and help turn early conversations into funded pilots, programmes and long-term customer relationships. You will work closely with Cosine’s Defence Lead, technical teams and senior leadership. You will build relationships across the MOD, the Armed Forces, wider Government and the UK defence industry, while helping define Cosine’s position in the emerging sovereign AI market. ___________________________________________________________________________ What you’ll do • Build and own a prioritised Defence account and opportunity strategy. • Develop trusted relationships with senior stakeholders across the MOD, Front Line Commands, wider Government and defence industry. • Identify operational problems, programmes and capability gaps where Cosine can make a material difference. • Translate customer needs into clearly defined use cases, propositions, pilots and programmes. • Navigate Defence stakeholders, budgets, acquisition routes, procurement processes and decision-making structures. • Lead opportunities from initial conversation through demonstration, technical evaluation, commercial agreement and delivery. • Work with Cosine’s technical teams to create credible customer propositions without overpromising. • Develop relationships with primes, strategic partners and specialist technology companies where this creates a stronger route to market. • Maintain disciplined account planning, pipeline management, qualification and forecasting. • Bring structured customer and market insight back to Product, Engineering, ML and senior leadership. ___________________________________________________________________________ What we’re looking for You may have served in the UK Armed Forces or worked closely with Defence in engineering, capability development, acquisition, procurement, digital transformation or technology adoption. You may subsequently have worked in consulting, technology, industry or an advisory role. What matters is that you understand how Defence works and can turn a customer need into commercial momentum. You should have: • Meaningful experience of the UK Defence ecosystem. • Strong existing relationships across Defence, Government or industry, and the ability to build new ones. • Experience introducing, acquiring or adopting complex technology. • The ability to structur

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