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ManTech International seeks a Senior Systems Engineer to design, integrate, and optimize complex mission systems for U.S. defense and intelligence customers. In this role, you will lead end-to-end system engineering-from requirements and architecture through deployment and sustainment-while ensuring security, scalability, and high availability. You will collaborate with cyber, data, and IT teams, troubleshoot complex issues, support accreditation and compliance, and mentor junior engineers in a mission-focused, innovation-driven environment.