This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Corporate Security Systems Engineer based in United States. This is a hands-on security engineering opportunity focused on protecting and scaling a modern corporate technology environment. You will own and improve critical security capabilities spanning endpoints, identity, SaaS applications, browsers, Zero Trust, and security monitoring. The role combines security engineering, systems administration, automation, and continuous control validation. You will turn security and compliance requirements into durable technical controls that are measurable, repeatable, and resilient to configuration drift. A key focus will be reducing manual security operations through APIs, infrastructure-as-code, workflows, and intelligent automation. You will collaborate closely with IT, Security Operations, GRC, and application owners while maintaining a strong security-first perspective. Your work will directly strengthen organizational resilience, audit readiness, telemetry, and the overall security posture of a growing technology organization.