MANTECH seeks a motivated and customer-focused Senior Security Engineer to join our team in Chantilly, VA . In this role, you will help design, implement, and sustain mission-driven network solutions that enable secure enterprise operations. You will provide technical leadership and hands-on expertise in supporting Comply-to-Connect (C2C) systems across both classified and unclassified environments. Responsibilities include but are not limited to: Engineering, designing, implementing, integrating, and sustaining Comply-to-Connect (C2C) deployment support to migrate, deploy, enhance, and maintain C2C services Managing and maintaining C2C appliances, applications, servers, and supporting infrastructure in unclassified and classified environments Coordinating with the network service provider to develop and maintain network architecture diagrams Evaluating and recommending changes or technology upgrades to support performance improvements, standardization, and alignment with industry best practices Monitoring and analyzing C2C performance and faults and proposing solutions for optimization Collaborating with other team members and customers across multiple levels to gather, supply, or coordinate technical and operational information Supporting Assessment and Authorization activities related to network security technologies, as applicable

Minimum Qualifications: Bachelor’s degree, or an additional 4+ years of network experience in lieu of a degree 5+ years of experience in network support Hands-on experience with technologies supporting large-scale enterprise deployments or data centers Experience deploying and/or supporting enterprise security software such as firewalls, intrusion prevention systems (IPS), antivirus solutions, application firewalls, high availability systems, network management tools, and virtualization platforms Strong knowledge of Windows and Linux systems, operating system security practices, TCP/IP networking, 802.1x, and core network security principles IAT Level II certification (GSEC, Security+, SSCP, or CCNA-Security), or ability to obtain within 6 months of hire

Preferred Qualifications: Experience implementing and supporting complex, multi-component software solutions Familiarity with vendor-agnostic C2C capabilities, open-source network tools, DoD integration practices, and sustainment procedures for delivering enterprise C2C expertise Proficiency with Cisco Identity Services Engine (ISE)

Clearance Requirements: An active TS/SCI with Polygraph is required for this position.

Physical Requirements: Must be able to remain in a stationary position 50% of the time. Needs to occasionally move about inside the office to access file cabinets, office machinery, etc. Frequently communicates with co-workers, management, and customers. Must be able to exchange accurate information in these situations.