Unix​/Linux Network & Systems Admin

Job Title:

Unix/Linux Network & Systems Admin

Job Location:

Portsmouth, Virginia - Onsite

Compensation: $85,000 to $90,000 salary, benefits, PTO, 401k, etc.

Eligibility/Clearance:
Active Top-Secret Clearance Required. This opportunity supports a government contract.

We are seeking a Senior Network and Computer Systems Administrator who 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.

• 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.

• Strong knowledge of TCP/IP, VLANs, routing protocols (OSPF, BGP), and network monitoring tools.
• 7+ years of experience in enterprise networking.

• Bachelor’s degree in IT, Computer Science, or related field.

ATR is an Equal Opportunity Employer (EOE) who will provide equal employment opportunity to employees and applicants for employment without regard to race, ethnicity, religion, color, sex, pregnancy, national origin, age, veteran status, ancestry, sexual orientation, gender identity or expression, marital status, family structure, genetic information, or mental or physical disability.