Job title: Founding Developer Evangelist / Solutions Engineer - (Enterprise)

Location: London; full in-office working as default

Start date: ASAP

Reports to: CTO, with dotted line to CRO and CEO

Compensation: £60k–£90k base (potential to go higher depending on experience) plus equity

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Cosine at a glance At Cosine, we’re building autonomous AI engineers that plan, write, and ship code inside real development workflows.

Cosine is designed for on-premise and virtual private cloud (VPC) deployments, including fully air-gapped environments. We build our agent tooling entirely in-house and post-train open-source models to deliver reliable, enterprise-grade coding performance in security-critical settings.

In 2024, Cosine achieved a 72% score on OpenAI’s SWE-Lancer benchmark, placing us among the strongest real-world software-engineering AI systems evaluated.

YC-backed and well-funded, Cosine was founded by experienced operators focused on building dependable, production-grade AI.

This role is based in our Hoxton office, five days a week, because close collaboration, fast feedback, and shared context matter for the problems we’re solving. ___________________________________________________________________________

The role At Cosine, enterprise adoption depends on technical trust . Autonomous agents are still poorly understood, often oversold, and rarely inspected with the rigour serious engineering teams require.

We are hiring a Founding Developer Evangelist to make Cosine’s technology legible, credible, and evaluable to the world’s most sophisticated engineering teams.

This Role Sits At The Intersection Of

• Deep technical understanding (agents, ML systems, evals, infrastructure)
• Enterprise-facing technical communication
• Hands-on support for real-world evaluations and pilots

Content creation is a core tool, but not the end goal.

The goal is to help enterprises understand, trust, and safely evaluate Cosine .

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What You’ll Do

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How Success Will Be Measured (first 6–12 Months)

• Enterprise engineers can accurately explain Cosine’s architecture, evaluation approach, and differentiation after engaging with Cosine.
• Technical objections during evaluations become clearer, fewer, and more repeatable over time.
• Prospective customers report increased confidence in evaluating Cosine safely.
• Insights from enterprise evaluations directly inform product decisions, documentation, and evaluation strategy.
• Sales and leadership rely on this role as a trusted technical voice in high-stakes conversations.

You’ll Thrive Here If You

• Have deep technical credibility: you’ve worked as a software engineer, ML engineer, or in a highly technical role and are comfortable reasoning about real systems, trade-offs, and failure modes

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Cosine is an equal opportunity employer. We value diverse backgrounds, perspectives, and ways of thinking, and we’re committed to creating an inclusive and respectful workplace.

We encourage applications from anyone who meets the role requirements, even if you don’t meet every single qualification. If you need reasonable adjustments at any stage of the hiring process, we’re happy to discuss them.

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Compensation, Benefits & Ways Of Working We’re an in-office team, five days a week, by design. We believe the work we’re doing benefits from being together, collaborating closely, and building shared context.

What You Can Expect

• Competitive salary, benchmarked to the market
• Equity / share options, so you share in the upside you help create
• 30 days’ holiday + bank holidays
• Genuine 9–5 working hours — we don’t expect late nights or weekend work
• Work hard in the office, collaborate closely, and switch off properly
• Dog-friendly office — bring your dog to work
• Daily lunch provided
• Monthly team breakfasts

We care about focus, sustainability, and doing great work — not performative overwork. We value people who show up, contribute thoughtfully, collaborate well with their colleagues, and then go home.

This role won’t suit everyone. But if you want structure, clarity, strong collaboration, and a team that takes both the work and work-life balance seriously, it’s a great place to be.