Staff Security Engineer, Product 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 Security Engineer, Product Security based in the United States. The Staff Security Engineer, Product Security will shape security architecture and engineering practices across a broad portfolio of products, services, and global infrastructure. This senior technical role combines hands-on security engineering with organization-wide architectural influence, ensuring that secure-by-default principles are embedded throughout product development. You will establish scalable security patterns, lead reviews of high-risk features, and guide engineering teams through complex design and threat-modeling decisions. Beyond individual security assessments, you will build programs, tools, and services that extend security expertise across hundreds of engineers. Working closely with platform, infrastructure, and product engineering teams, you will address systemic vulnerabilities and strengthen security throughout the software development lifecycle. You will also mentor engineers, lead multi-team initiatives, and serve as a trusted technical authority on product security.