Windows Systems Administrator

Leidos • Reston, VA

1d

About The Position

We are seeking a Senior Infrastructure Engineer to support and operate mission-critical, enclave-based environments across on-premises VMware infrastructure and AWS cloud. This role sits at the center of a high-security, high-availability ecosystem, supporting systems where downtime has real operational impact. You will be responsible for owning, stabilizing, and improving a complex hybrid environment consisting of both legacy and modern platforms. This is not a passive support role—this is for someone who can step in, take control of the environment, and drive reliability and performance forward.

Requirements

• Must have at least 12 years of experience in systems engineering or infrastructure engineering
• Active TS/SCI with Poly
• Strong experience supporting Windows enterprise environments
• Proven experience in high-availability / mission-critical systems
• Experience operating in restricted, regulated, or air-gapped environments
• Strong troubleshooting skills across OS, virtualization, networking, and storage layers
• Ability to work independently and take ownership of complex systems

Nice To Haves

• PowerShell / Bash scripting
• Experience with compliance frameworks (STIGs, RMF, NIST)

Responsibilities

• Administer and maintain Windows-based infrastructure across enclave environments
• Manage VMware vCenter / ESXi (host performance, VM lifecycle, resource optimization)
• Support AWS cloud infrastructure (EC2, VPC, storage, IAM fundamentals)
• Maintain and troubleshoot Active Directory, Group Policy, and identity systems
• Oversee patching and system compliance via WSUS and SCCM
• Administer Microsoft Exchange and Citrix environments
• Maintain DNS, networking, and core infrastructure services
• Support and optimize SAN storage environments
• Manage backup and recovery operations using Rubrik
• Support and troubleshoot security platforms, including: Trellix ePO Rapid7 Security Onion IDS Centrify
• Perform deep-dive troubleshooting and root cause analysis across systems
• Maintain system documentation, SOPs, and incident response procedures
• Identify and implement infrastructure improvements and automation opportunities

Benefits

• Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 5,001-10,000 employees