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
- 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:
- 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
- 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 - Windows Server (2016/2019/2022)
- Linux (Rocky Linux, Red Hat)
- AWS (EC2, VPC, storage, IAM basics)
- Active Directory & Group Policy
- DNS / networking fundamentals
- 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.
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