Staff Platform Security Engineer (Security)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Staff Platform Security Engineer (Security) based in Canada. As a Staff Platform Security Engineer, you will own security across critical AWS and Kubernetes infrastructure supporting products used by millions of people. You will work hands-on across cloud security, identity and access, workload isolation, CI/CD, software supply chains, and production systems. The role combines security architecture with practical engineering, requiring you to write code, build infrastructure controls, respond to incidents, and drive verified remediation. You will partner closely with infrastructure, SRE, developer experience, and product engineering teams to embed security into the platform without slowing delivery. You will also help shape an AI-native security function that uses automation and AI-assisted workflows to increase security coverage and response speed. This is a high-impact opportunity to influence architecture and strengthen the security of mission-critical systems in a fully remote environment.