Senior Security Engineer at Apollo Research – London or San Francisco

Looking for security engineer jobs in the UK with visa sponsorship? Apollo Research is hiring a Senior Security Engineer to join its Infrastructure and Security team, based on-site in London or San Francisco. Apollo works with frontier AI labs including OpenAI, Anthropic, Google and Meta, and its Watcher product monitors billions of AI agent tokens per month in production.

Apollo Research focuses on risks from AI models evading human oversight, including deceptive alignment and scheming. It works closely with major AI labs to test models before deployment and publishes research on detection and mitigation, alongside its commercial coding-agent security product, Watcher.

Apollo Research confirms it sponsors visas in both the UK and the US. Sponsorship is not guaranteed for every role or candidate, but the company states it will work with a successful applicant to find the right visa route, and relocation support and visa fees are covered where applicable. This makes it a genuine option for international applicants targeting security engineer jobs in the UK.