Senior Network Administrator

ValidaTek, Inc.•Columbus, OH

8d•Onsite

About The Position

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.

Requirements

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+) – required.
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.

Nice To Haves

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.

Responsibilities

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 required.
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.
Provide mentorship to team members across daytime and evening shifts.