Senior Network and Computer Systems Administrator with Security Clearance

Senior Network and Computer Systems Administrator Portsmouth, VA Job Summary We are seeking a Senior Network and Computer Systems Administrator is responsible for the design, implementation, and maintenance of enterprise network and server infrastructure to ensure secure, reliable, and high-performance IT operations. This role combines advanced networking expertise with comprehensive systems administration skills to support mission-critical environments. Responsibilities * Configure, monitor, and troubleshoot routers, switches, firewalls, and VPNs. * Manage network performance, capacity planning, and QoS policies. * Implement and maintain network security measures (ACLs, IDS/IPS, STIG compliance). * Perform firmware upgrades, patching, and vulnerability remediation. * Support disaster recovery and business continuity planning. * Document network architecture, configurations, and change management processes. Education and Experience * Bachelor's degree in IT, Computer Science, or related field. * 10 years of experience in enterprise networking. Required Skills * Strong knowledge of TCP/IP, VLANs, routing protocols (OSPF, BGP), and network monitoring tools. Security Clearance * U.S Citizen * Active Top Secret (T5) #cjjobs Marathon TS is committed to the development of a creative, diverse and inclusive work environment. In order to provide equal employment and advancement opportunities to all individuals, employment decisions at Marathon TS will be based on merit, qualifications, and abilities. Marathon TS does not discriminate against any person because of race, color, creed, religion, sex, national origin, disability, age or any other characteristic protected by law (referred to as "protected status ").