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 ").
Numbers & Facts
Location
Portsmouth, VA
Skills
BGPunmatched
Business Continuity Planning (BCP)unmatched
Capacity and Performance Managementunmatched
Change Managementunmatched
Computer Firmwareunmatched
Computer Networksunmatched
Computer Scienceunmatched
Configuration Managementunmatched
Disaster Recoveryunmatched
Firewallsunmatched
Identify Issuesunmatched
Information Technology & Information Systemsunmatched
Intrusion Detection Systemsunmatched
Intrusion Prevention Systemsunmatched
Network Administration/Managementunmatched
Network Architecture/Engineeringunmatched
Network Configuration Managementunmatched
Network Monitoringunmatched
Network Routersunmatched
Network Securityunmatched
Network Switchingunmatched
Open Shortest Path First Protocol (OSPF)unmatched
QoS (Quality of Service)unmatched
Routing Protocolsunmatched
Software Patchesunmatched
Systems Administration/Managementunmatched
TCP/IP (Transmission Control Protocol/Internet Protocol)unmatched
VLAN (Virtual Local Area Network)unmatched
VPN (Virtual Private Network)unmatched
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