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Job title: Senior Developer Evangelist

Location: London; full in-office working as default

Start date: ASAP

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

Compensation: £60k–£90k base (depending on experience) plus equity

Cosine at a glance

• 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 makes us unique is our in-house ML research lab that post-trains LLMs (e.g. Nova, gpt-oss, Kimi) on proprietary software-engineering reasoning data to dramatically increase their coding accuracy. In 2024 this gave us a world-leading score of 72% on OpenAI’s SWE-Lancer benchmark
• Cosine is now the only available managed product that can be fully air-gapped and deployed on premises, exciting many bulge bracket but extremely risk sensitive and strict enterprises that have rejected all other solutions on the market. We've got our first pilots up and running with global investment banks and defence primes

The role

At Cosine we work with some of the world’s most sophisticated engineering teams and forward-thinking enterprises. Now we’re looking for someone who can help us tell that story with clarity, technical depth, and creative polish. We are therefore hiring a Senior Developer Evangelist to own and scale Cosine’s technical storytelling across written, visual, and video formats.

This is a rare hybrid role for someone who is:

• Deeply technical (comfortable reading research papers, evaluating model behaviours, understanding developer workflows, inspecting architecture diagrams, and explaining nuanced ML concepts)
• Also a world-class communicator who can make complex systems feel simple, exciting, and credible through writing, visualisation, and polished video content

Your work will shape how enterprises, developers, policymakers, and the broader market understand Cosine’s technology and why our approach is fundamentally different.