This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a System Test Engineer Senior based in the United States. The Senior System Test Engineer will play a critical role in validating complex enterprise and cybersecurity-focused systems.You will translate system, security, and design requirements into comprehensive test strategies, cases, procedures, and scripts.The role covers system, integration, functional, and end-to-end testing across sophisticated technical environments.You will help ensure that solutions meet quality, security, compliance, and operational expectations before deployment.Working closely with developers and engineers, you will investigate defects, validate fixes, and maintain clear testing evidence.The position offers exposure to cybersecurity and Zero Trust concepts within a mission-focused engineering environment.This is a remote opportunity with travel of approximately 25–50% and requires an active Secret clearance.