Job title: Machine Learning Engineer – Lumen Enterprise Models (SWE-focused LLMs)

Location: London; full in-office working as default

Start date: ASAP

Reports to: CEO

Compensation: Salary and Equity options available for discussion

Application deadline: 08/11/26 at 23:59 UK time

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Help train the software engineers of the future

Cosine is building autonomous software-engineering systems for organisations where reliability, security and control matter most.

Our Lumen Enterprise models are designed to work across real codebases. They need to understand unfamiliar architectures, make changes across multiple files, use tools, run tests and produce software that engineers can maintain and trust.

We’re looking for a Machine Learning Engineer to help train and improve these models.

You’ll work across the full training stack, including pre-training, s