Windows Systems Administrator

R-00181039

Description

Position Overview  

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 .  

 

Clearance Requirement  

• Active TS/SCI with Poly security clearance   required  
  

• Must be eligible to work in   restricted / air-gapped environments    
  

 

What   You’ll   Own  

• Two   standalone/enclave Windows domains :   
  

• On-prem VMware-based infrastructure    
  

• AWS-hosted environment    
  

• A   24/7 mission-critical system footprint    
  

• Core enterprise services: identity, storage, compute, backup, and security tooling   
  

• Environments with   limited external connectivity and strict security controls    
  

 

Key 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    
  

 

Environment Characteristics  

• Air-gapped / enclave networks    
  

• Hybrid   on-prem (VMware) + AWS cloud    
  

• Legacy mission systems   with modernization constraints   
  

• Security-first architecture with   strict compliance requirements    
  

• High uptime expectations   with minimal tolerance for disruption   
  

 

Required Qualifications  

• 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    
  

 

Core Technical Expertise  

• Operating Systems    
  

• Windows Server (2016/2019/2022)   
  

• Windows 11   
  

• Linux (Rocky Linux, Red Hat)   
  

• Virtualization & Cloud    
  

• VMware vCenter /   ESXi    
  

• AWS (EC2, VPC, storage, IAM basics)   
  

• Core Infrastructure    
  

• Active Directory & Group Policy   
  

• DNS / networking fundamentals   
  

• SAN Storage   
  

• Systems Management    
  

• SCCM, WSUS   
  

• Microsoft Exchange   
  

• Citrix   
  

• Security Tooling    
  

• Trellix   ePO    
  

• Rapid7   
  

• Security Onion IDS   
  

• Centrify   
  

• Backup & Recovery    
  

• Rubrik   
  

• Preferred    
  

• PowerShell / Bash scripting   
  

• Experience with compliance frameworks (STIGs, RMF, NIST)   
  

 

Operational Expectations  

• Support a   24/7 operational environment    
  

• Participate in a   rotational on-call schedule    
  

• Must be able to   respond (Return-to-Base) within 2 hours , including travel if   required    
  

• Support   after-hours maintenance windows and incident response    
  

 

What Sets This Role Apart  

• Direct ownership of   mission-critical systems supporting real-world operations    
  

• Opportunity to work in   secure, high-impact environments    
  

• Exposure to both   legacy infrastructure challenges and modernization efforts    
  

• Ability to   drive meaningful improvements , not just   maintain   status quo   
  

 

Who   We’re   Looking For  

An engineer who:  

• Has   operated   in   cleared environments   and understands the constraints   
  

• Can walk into a   complex, imperfect system   and make it better   
  

• Doesn’t   wait for direction— identifies   problems and solves them    
  

• Is trusted to handle   high-pressure situations without supervision    
  

• Brings both   technical depth and operational accountability    
  

 

Bottom Line  

If   you’re   looking for a role where:  

• Your work directly supports   critical operations    
  

• You have   real ownership and responsibility    
  

• And your impact is   immediate and visible    
  

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.
Original Posting: April 17, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range: Pay Range $116,350.00 - $210,325.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com .

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission .

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.