ML Systems Engineer - Model Training and Infrastructure (SWE-focused LLMs)

Job title: ML Systems Engineer - Model Training and Infrastructure (SWE-focused LLMs)

Location: London; full in-office working as default

Start date: ASAP

Compensation: £80,000 - £110,000 Base Salary & £80,000 - £110,000 Share options.

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 ...