Senior Systems Administrator (Unix/Linux) #1643615

Network Designs•Dahlgren, VA

3d•Onsite

About The Position

NDi is seeking a skilled Systems Administrator (Unix/Linux) to provide enterprise-level administration and support for a large, mission-critical federal IT program. The Systems Administrator will manage and maintain Unix and Linux systems across multiple environments, ensuring reliable, secure, and efficient operations. This role involves system installation, configuration, performance tuning, troubleshooting, and applying cybersecurity controls consistent with DoD and federal security standards.

Requirements

U.S Citizenship required.
Active Top Secret Clearance required.
This position requires 5 days onsite in Dahlgren, VA. Please note that up to 40% remote work may become available but this determination will be made at a later stage.
Six (6) of professional experience in Unix and/or Linux system administration of networks and software systems.
System backup and recovery, basic software management, security management, and library management.
Installation and configuration of hardware, COTS software, and operating systems across multiple environments.
Skilled in sizing, performance tuning, troubleshooting, and resource allocation for hardware, software, and network components.
Qualified experience with network protocols including TCP/IP and major network security tools such as firewalls; knowledge of computing and networking vulnerabilities, attack methods, and detection techniques.
Certifications (DoD 8570/8140 IAT Level III), minimum of one: CASP+ CE, CCNP Security, CISA, CISSP (Associate or Full), GCED, GCIH, CySA+ CE, CCSP, PenTest+ CE, or GSE. If you do not currently hold any of the above certifications, you must be willing to obtain one by March 1, 2026.
Proven ability to manage and secure complex Unix/Linux environments in compliance with DoD STIG and RMF requirements.
Advanced system administration and scripting in Unix/Linux environments.
Knowledge of DoD cybersecurity policies, RMF, and STIG implementation.
Strong diagnostic and problem-resolution skills.
Familiarity with enterprise monitoring and configuration-management tools.
Excellent communication and documentation abilities.

Nice To Haves

Master's level degree in Electrical/Electronic/Computer Engineering, Computer Science, or Information Systems.

Responsibilities

Install, configure, and maintain Unix/Linux servers, ensuring uptime and performance.
Perform system backups, restore, and patch management.
Implement and monitor security measures to protect systems and data .
Manage and troubleshoot TCP/IP network configurations.
Configure and maintain firewalls and other network security tools.
Identify vulnerabilities and implement mitigation or remediation strategies. .
Analyze system performance metrics and conduct capacity planning.
Provide Tier III support for complex technical issues.
Collaborate with engineering, cybersecurity, and operations teams to ensure secure, optimized system performance .