Senior Network Administrator

ValidaTek-posted 9 days ago
Full-time • Mid Level
Onsite • Columbus, OH
101-250 employees
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SHIFT TIME: MONDAY - FRIDAY 3 PM - 11 PM ValidaTek is seeking a skilled and experienced Senior Network Administrator to join our Cybersecurity Systems Support (CSS) team supporting the Defense Information Systems Agency (DISA). This position plays a key role in the configuration, maintenance, and security of network infrastructure in a mission-critical DoD environment. The role is 100% on-site in Columbus Ohio and requires strong technical expertise , problem-solving skills, and the ability to work in a dynamic, team-oriented environment.

  • Administer, monitor, and support LAN/WAN infrastructures, including routers, switches, firewalls, and network appliances.
  • Perform network performance monitoring and troubleshoot connectivity and performance issues.
  • Plan and implement network upgrades and configuration changes with minimal downtime.
  • Manage network security protocols, including firewall rule sets, VPNs, and access control policies in accordance with DoD cybersecurity standards.
  • Support network integration with cybersecurity tools, including HBSS, ACAS, and SIEM platforms.
  • Maintain compliance with DoD STIGs and IA Vulnerability Management (IAVM) directives.
  • Collaborate with cybersecurity and system administration teams to implement RMF security controls and support ATO/IATT efforts.
  • Manage and document network configurations, diagrams, and change logs.
  • Perform packet capture analysis, port scanning, and network vulnerability assessments as .
  • Coordinate with vendors and DISA stakeholders to resolve hardware/software/network issues.
  • Respond to and support network-related incident response activities and investigations.
  • Provide subject matter expertise on network architecture, segmentation, and enclaving.
  • Participate in the development and maintenance of network contingency and disaster recovery plans.
  • Active Secret clearance with the ability to obtain a Top Secret clearance.
  • Bachelor’s degree in Computer Science , Information Technology, or related field OR equivalent professional experience.
  • DoD 8570 IAT Level II certification (e.g., Security+ CE, CCNA Security, CySA +) – .
  • 8+ years of experience in network administration or engineering in a DoD or enterprise environment.
  • In-depth experience utilizing Juniper and Cisco...Juniper - highly utilized.
  • In-depth understanding of TCP/IP, routing protocols (e.g., OSPF, BGP), VLANs, VPNs, and firewall technologies.
  • Experience configuring and managing Cisco, Juniper, or similar network devices.
  • Configure, manage, and troubleshoot Cisco and Juniper network devices, including routers, switches, and firewalls.
  • Implement and maintain routing protocols (e.g., BGP, OSPF, EIGRP) in mixed Cisco and Juniper environments.
  • Familiarity with DoD RMF, network-related security controls, and eMASS .
  • Proficiency in using network diagnostic tools (e.g., Wireshark, SolarWinds, NetFlow).
  • Experience with network hardening, STIG compliance, and IAVA remediation.
  • Working knowledge of ITIL processes, change management, and configuration management .
  • CCNA, CCNP, or similar vendor certifications strongly preferred.
  • Experience supporting DISA infrastructure, policies, and standards.
  • Familiarity with cloud networking and cross-domain solutions (CDS).
  • Knowledge of Zero Trust Architecture (ZTA) principles and implementation strategies.
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