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:September 2, 2026For 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.
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.
Skills Required
- At least 12 years of experience in systems engineering or infrastructure engineering
- Active TS/SCI with Poly security clearance
- Eligibility to work in restricted or air-gapped environments
- Strong experience supporting Windows enterprise environments
- Experience supporting high-availability or mission-critical systems
- Experience operating in restricted, regulated, or air-gapped environments
- Strong troubleshooting skills across operating system, virtualization, networking, and storage layers
- Ability to work independently and take ownership of complex systems
- PowerShell or Bash scripting
- Experience with STIG, RMF, or NIST compliance frameworks
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
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