Senior Windows SysAdmin (TS/SCI Poly) — Flexible Schedule

Leidos; Maryland; On-site; USD 116,000 - 210,000; Full time

Benefits offered by this job

Health benefits

Paid time off

11 holidays

401K with 6% match

Education and training support

Parental paid leave

Flexible schedules

Job summary

Leidos is seeking a Senior Windows System Administrator to join a high-performing agile team within the SAFe framework, supporting a complex, fast-paced program across a broad geographic footprint. The role emphasizes system administration, O&M, and security operations for VMware, Windows, Linux, and VDI environments.

The candidate will monitor infrastructure, manage AD/ DNS/ GPOs, perform patching and vulnerability remediation, and maintain robust documentation while coordinating with partner

Qualifications

• Bachelor’s degree in Computer Science or related field, plus 12 years of experience or equivalent.
• Minimum 7 years Windows administration experience.
• 7+ years in information security management and governance.
• 5+ years with AD, DNS, GPOs, SCCM, Exchange administration.
• Proficient in Windows PowerShell and scripting; strong security fundamentals.

Responsibilities

• Monitor and maintain Windows servers and VDI across multiple sites.
• Configure servers, routers, firewalls, and security controls per SSPs.
• Perform vulnerability scanning, IAVA management, and remediation.
• Respond to incidents and coordinate with cross-functional teams.
• Document procedures, updates, and status communications to users.

Skills

Windows administration

Information security governance

Active Directory

DNS

Group Policy Objects

PowerShell

VMware

IAVA management

Education

Bachelor’s degree in Computer Science/IT or related field

Tools

SCCM

Exchange Management Shell

VDI

Job description

Leidos is seeking a Senior Windows System Administrator to join a high-performing agile team within the SAFe framework, supporting a complex, fast-paced program across a broad geographic footprint. The role emphasizes system administration, O&M, and security operations for VMware, Windows, Linux, and VDI environments.

The candidate will monitor infrastructure, manage AD/ DNS/ GPOs, perform patching and vulnerability remediation, and maintain robust documentation while coordinating with partner