Sr Windows System Engineer/SME

Cyber Security Courses; Reston (VA); Hybrid; USD 108,000 - 195,000; Full time

Benefits offered by this job

Hybrid work arrangement

Competitive compensation

Job summary

Leidos is seeking a highly skilled Windows Infrastructure Engineer in Reston, VA to secure, scale, and support core identity platforms. You will own AD and Entra ID architectures, manage PKI, and drive robust identity solutions across hybrid environments.

You will lead Tier 3 engineering, contribute to automation, and ensure compliance with NIST/FISMA controls while maintaining system availability and security. Strong scripting and certification are expected.

Qualifications

• Eight+ years of Windows Infrastructure experience or six+ years with a related Master’s degree.
• Experience in cloud operations, engineering, or related field.
• Senior/lead level with design and architecture ownership for an enterprise Windows environment.
• Familiarity with federal compliance (NIST, FISMA, FedRAMP) and CIS 4.0 controls.
• Experience with Azure governance frameworks and DoD Zero Trust principles.
• Networking concepts and cloud-based networking configurations.

Responsibilities

• Identify Architecture and design security-focused identity solutions.
• Manage PKI and AD CS environments.
• Architect Azure Entra ID and Azure AD integrations for SSO and RBAC.
• Provide Tier-3 escalation and architectural support across hybrid environments.
• Support automation tasks and infrastructure-as-code workflows.
• Maintain Windows Server OS (2019, 2022, 2025) in data centers.
• Drill into incidents, perform root-cause analyses, and drive improvements.

Skills

Cloud governance

Federated identity

Networking fundamentals

Scripting

Education

Bachelor’s degree in computer science / information systems / engineering or related field

Master’s degree with 6+ years relevant experience

Tools

Active Directory

Azure AD / Microsoft Entra ID

PKI / AD CS

ServiceNow

Visio

PowerShell

Job description

This highly skilled Windows Infrastructure Engineer position will have experience in securing, scaling, and supporting core enterprise identity and access management platforms. In this role, the candidate will serve as the subject matter expert and highest-tier escalation point for our Active Directory (AD) environment and Azure Active Directory /Microsoft Entra ID cloud integrations. They will be responsible for engineering and architecting robust identity solutions, managing our Enterprise Public Key Infrastructure (PKI), and providing high-level tier -3 architectural support to ensure optimal security, compliance, and system availability across our hybrid environment. This technical resource will support and engage with the infrastructure team on the various tasks being supported by the team at a higher technical level. The position will set standards the rest of the team builds to and serve as an escalation point when an issue escalates to Tier 3 support. They may also provide hands‑on support in program operations, configuration, deployment, maintenance, monitoring, maintenance and trouble‑shooting activities. A summary of the areas they will provide and qualifications.

• Identify Architecture
• Security & PKI Management
• Cloud Design
• Azure Engineering, Administration, and Optimization
• Tier 3 Engineering and Trouble‑shooting Support
• Access Governance
• Automation and Optimization
• Disaster Recovery
• Continuous Improvement
• Documentation Compliance

Required Qualifications

• Bachelor’s degree (or equivalent) in computer science, information systems, engineering, or a related technical field, and eight (8) or more years of progressive Windows Infrastructure Engineer and Architect experience OR Master’s degree in a related field and at least 6 years of relevant experience in above areas. Equivalent experience can substitute for the degree.
• A minimum of six (6) years of experience in cloud operations, engineering, or related field.
• A minimum of three (3) years performing at a senior and lead level with design and architecture ownership for an enterprise Windows environment.
• Familiarity with federal compliance (NIST, FISMA, FedRAMP) and CIS 4.0 controls.
• Significant experience designing, operating and maintaining Microsoft Azure environments to include Zero Trust, hybrid cloud, and cross-domain architectures in mission environments.
• Experience with the configuration, deployment, and management of Microsoft Entra ID / Azure AD for centralized identity, single sign-on (SSO), and role-based access control (RBAC) across Azure tenants and subscriptions.
• Demonstrated experience with the integration of federated identity solutions with AWS Identity Center, Entra, or on-premises Active Directory.
• Develop and enforce Azure governance frameworks, including Azure Policy, Management Groups, and Blueprints, ensuring alignment with DoD Zero Trust and least-privilege principles.
• Experience with Azure Monitor and cost optimization strategies.
• Deep expertise in Microsoft Azure architecture, Microsoft Entra ID and on-prem interoperability.
• Ability to script in one more of the following computer languages PowerShell or others.
• Strong understanding of federated identity, modern authentication protocols (SAML, OIDC, OAuth 2.0), and cross-cloud authentication mechanisms.
• Deep expertise in Microsoft Azure architecture, Microsoft Entra ID and on-prem interoperability.
• Hands on experience with and knowledge of networking concepts (DNS, VPNs, load balancers, etc.) and cloud-based networking configurations.
• Configure, maintain and upgrade 2019, 2022, & 2025 servers operating systems by performing system administration tasks related to:
  • Microsoft Application installation and maintenance
  • 3rd Party software installation and maintenance

• Configure, maintain and upgrade physical and virtual server installations in FTC datacenters, to include:
  • OS installation and configuration
  • Out of Band management configuration (iLO, etc.)
  • Hardware installation/maintenance (network adapter, memory, hard drives, etc.)
  • RAID Configuration
  • Network adapter configuration
  • SCSI and Fiber Channel configuration

• Experience and ability to immediately contribute to Automation Tasks and Infrastructure-as-Code tools and templates.
• Provide experience designing, deploying, and maintaining Active Directory Certificate Services (AD CS) / PKI environments.
• Applied knowledge of system security engineering, including CIS and STIG hardening, vulnerability management, and federal compliance frameworks (FISMA, NIST SP 800-53).
• Extensive experience with Visio or other networking diagram tools and solid understanding of Networking principles.
• Excellent troubleshooting skills with the ability to resolve complex technical issues in a timely manner.
• Strong problem-solving skills and ability to conduct root cause analysis.

• Actively participate in the process of reviewing and improving operational processes, procedures, technology, and documentation. Support the program team in efforts to improve service delivery to the customer. Adopt program directed procedural changes, process changes, and tool changes as required for the role.
• Perform work activities in accordance with program processes, procedures, and service level agreements.
• Support other anticipated requirements that will emerge and are reasonably aligned to the role supporting server elements of the infrastructure.

• Demonstrated ability to complete technical projects independently, with strong organizational skills and attention to detail.

• Create, monitor and drive to resolution change requests and trouble tickets for service level changes that affect Windows Servers and applications installed on Windows servers.

• Excellent written and verbal communication skills. This includes drafting SOPs and technical documentation as well as communication with senior program and customer leadership.

• Must be able to prepare data and presentations then active participation and presenting in Leidos and customer meetings as required.
• undefined
• Must be able to present designs, plans, courses of action, and analyses of alternatives to technical leadership personnel and boards for approvals.

• ServiceNow experience and review incoming ServiceNow tickets and work to resolve any incident tickets and service requests as assigned for:
  • Server builds
  • Server configuration changes
  • Windows Permissions changes
  • File Server ACL changes
• Application maintenance for: Symantec Endpoint Protection (Servers), Carbon Black Protection (Servers), DNS/DHCP Updates, & Active Directory (including Group Policy Objects).
• Maintain status of assigned tickets in accordance with program standards and program SLAs, including quality of status and timeliness of updates.

Required Certifications

• Current DoD 8570/8140 baseline certification appropriate for Intermediate System Administrator roles (e.g., Security+, GSEC, SSCP, or equivalent).

Preferred Certifications

• Sumo Logic Certified Administrator
• Sumo Logic Certified Security & Compliance
• MCSA: Windows Server 2008.
• MCITP: Enterprise Administrator.
• MCSE: Security on Microsoft Win Server 2003.
• MCSA: Security on Microsoft Win Server 2003.
• MCSE: Security on Microsoft Win 2000.
• MCSA: Security on Microsoft Win 2000.
• MCSE on Microsoft Win Server 2003.
• MCSA on Microsoft Win Server 2003.
• MCSE on Microsoft Win 2000.
• MCSA on Microsoft Win 2000.
• Microsoft Certified Professional.

Clearance, Citizenship, and Work Conditions

• Background requirements: Must possess, or be eligible to obtain and successfully complete, a Public Trust background investigation and/or Public Trust clearance.
• Citizenship: Must be a U.S. Citizen.
• Location: Telework:Work primarily offsite with the need to support on site as needed to meet the needs of the program. Remote support from locations other than FTC must be approved by the Leidos TO4 Program Manager.
• Hours: FTC core hours, Monday through Friday, 8:00 a.m. to 5:00 p.m. EST, with occasional overtime, weekend work, or after-hours response to critical outages and scheduled maintenance windows. (Hybrid: Onsite 2x per week. Hours charged limited to no more than 40 hours per week, unless specifically approved by the Leidos TO4 Program Manager.
• Physical requirements: Ability to lift 50+ pounds.

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

October 26, 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 $107,900.00 - $195,050.00

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 [e-mail].

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.

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