Senior Systems Administrator - Linux/Windows, TS/SCI

AMERICAN SYSTEMS

Arlington (VA)

On-site

USD 150,000 - 175,000

Full time

14 days+

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Benefits offered by this job

Sign-on bonus

Healthcare benefits

Retirement plans

Education and training assistance

Job summary

AMERICAN SYSTEMS in Arlington, VA seeks a Lead Systems Administrator to own and optimize enterprise Linux & Windows infrastructure across multiple datacenters. You will partner with cybersecurity and engineering teams, providing Tier III support for mission-critical systems and helping automate tasks with Bash scripts.

The role requires a TS/SCI clearance, 8–10 years in IT systems administration (3–5 years Linux), and DoD 8140 IAT Level II certification.

Qualifications

8–10 years of IT Systems Administration experience with 3–5 years Linux administration.
DoD 8140 IAT Level II cert (e.g., Security+ CE or equivalent).
Experience designing secure, scalable cloud/on-prem platforms (IL5-IL6+).
Knowledge of STIGs, RMF, and DoW cybersecurity standards.

Responsibilities

Support on-prem Linux (60%) and Windows (40%) infrastructure and applications.
Support on-prem vSphere infrastructure across multiple datacenters.
Provide Tier III support for production and development environments, managing tickets.
Monitor resource availability to meet customer requirements and throughput.
Review and optimize system performance for peak efficiency and reliability.
Analyze system resource usage and take corrective actions.
Review logs and ensure backups and scheduled tasks completed.
Create/manage user accounts, groups, and permissions; maintain local Linux repos.
Support on-prem and remote Linux-based Oracle database appliances.
Develop and maintain administrative Bash scripts for maintenance/automation.
Proficient in DNS administration.
Document and implement system administration solutions to meet business needs.