Job title: Strategic Partnerships Manager

Location: London; full in-office working as default

Start date: ASAP

Reports to: CRO

Compensation: Salary and Equity options available for discussion

Application deadline: 01/11/26 at 23:59 UK time

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Help build the UK’s sovereign AI future. Turn cutting-edge technology into commercial impact.

At Cosine, we’re on a mission to build the UK’s first sovereign Large Language Model, alongside some of the most advanced AI technology being developed today.

Our portfolio spans autonomous coding agents, specialised AI models, AI-native red teaming and sovereign AI solutions. We’re building technology that fundamentally changes how organisations develop software, modernise infrastructure, strengthen security and deploy AI where control over data and infrastructure is critical.

The opportunity is significant. The interest is already there. Now we need someone who can turn it into business.

We’re looking for an exceptional Partnerships Manager to build and scale Cosine’s partner ecosystem, with an immediate focus on systems integrators (SIs) and consultancies.

This is a commercially driven, hands-on role. You’ll own relationships, develop joint propositions, negotiate agreements and build customer pipeline. You’ll work directly with senior stakeholders at major partners and closely with our commercial, product and engineering teams.

This isn’t about managing an established partner programme. It’s about building one that delivers.

We need someone who can hit the ground running, operate independently and turn opportunities into results.

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What you’ll do

Build and activate strategic partnerships

• Own and develop relationships across the partner ecosystem, prioritising high-value SIs, consultancies and strategic technology partners.
• Convert existing interest into active, commercially productive partnerships while proactively opening new doors.
• Build relationships with senior executives, practice leaders and commercial teams, creating alignment and securing commitment.

Turn partnerships into revenue

• Drive partner opportunities from initial engagement through commercial negotiation, agreement and activation.
• Build joint account plans, identify customer opportunities and develop a qualified pipeline with clear commercial objectives.
• Work with partners and internal sales teams to progress opportunities into pilots, deployments and revenue.
• Take accountability for outcomes. Signed agreements matter, but active partners, customer engagements and revenue matter more.

Create propositions that partners can sell

• Work with product, engineering and commercial teams to develop compelling joint propositions around sovereign AI, coding agents, software modernisation and cybersecurity.
• Understand partner capabilities and customer challenges, identifying where Cosine’s technology creates real commercial value.
• Translate complex technology into clear, differentiated propositions that partners can confidently take to market.

Get hands-on and make things happen

• Run product demonstrations, partner workshops and enablement sessions. You’ll need to understand our technology, not just talk about it.
• Equip partner teams to identify opportunities, position Cosine effectively and engage customers.
• Navigate commercial, technical and organisational challenges to keep deals moving.
• Build the processes, reporting and partner engagement model needed to scale what works, without creating unnecessary bureaucracy.

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What we’re looking for

We want someone who has built partnerships that generate business, not simply managed relationships.

You’ll bring:

• A proven commercial track record. Demonstrable success building partnerships, developing pipeline and delivering revenue within enterprise technology, software or AI.
• Strong SI and consultancy experience. You understand how these organisations operate, how to navigate their internal structures and what it tak…