Senior Systems Engineer

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…