Windows Systems Administrator
Koitecc Solutions, Alexandria, VA, United States
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 legacy and modern platforms.
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:
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
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)
Other core infrastructure: Active Directory & Group Policy, DNS
etworking 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, compliance frameworks (STIGs, RMF, NIST)
Operational Expectations
Support a
24/7 operational environment
Participate in a
rotational on‑call schedule
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 technical depth and operational accountability
Bottom Line
Your work directly supports critical operations
You have real ownership and responsibility
Your impact is immediate and visible
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.
#J-18808-Ljbffr
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 legacy and modern platforms.
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:
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
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)
Other core infrastructure: Active Directory & Group Policy, DNS
etworking 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, compliance frameworks (STIGs, RMF, NIST)
Operational Expectations
Support a
24/7 operational environment
Participate in a
rotational on‑call schedule
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 technical depth and operational accountability
Bottom Line
Your work directly supports critical operations
You have real ownership and responsibility
Your impact is immediate and visible
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.
#J-18808-Ljbffr