Tier III Service Desk

We are seeking an experienced Tier 3 Service Desk Engineer to provide advanced technical support and operational expertise in support of enterprise endpoint migration initiatives. This role will serve as a senior escalation point for complex endpoint issues and will partner closely with Endpoint Engineering, Infrastructure, Security, and Service Desk teams to ensure successful migration activities and a stable end-user experience.

The ideal candidate will have strong troubleshooting skills across Windows endpoints, enterprise applications, identity, networking, device management, and endpoint security, along with the ability to diagnose and resolve issues that cannot be addressed through standard Tier 1/Tier 2 support processes.

CLEARANCE REQUIREMENT: Must hold an active Secret security clearance prior to start. (US Citizenship required) 

Key Responsibilities

• Provide Tier 3 technical support for issues associated with endpoint migration, deployment, provisioning, and post-migration stabilization.
• Troubleshoot complex Windows endpoint issues involving operating systems, drivers, applications, profiles, authentication, networking, peripherals, and device configuration.
• Support endpoint migration activities including device replacement, operating system upgrades, hardware refreshes, profile/data migration, application deployment, and user cutover.
• Investigate and resolve migration failures, deployment errors, application compatibility issues, configuration problems, and recurring endpoint incidents.
• Serve as the escalation point for Tier 1 and Tier 2 Service Desk teams and provide technical guidance and knowledge transfer.
• Partner with Endpoint Engineering and other technical teams to identify root causes and develop sustainable remediation strategies.
• Support endpoint management platforms such as Microsoft Intune, Microsoft Configuration Manager (SCCM/MECM), Autopilot, or comparable enterprise management technologies.
• Troubleshoot Microsoft 365, Teams, Outlook, OneDrive, authentication, VPN, printing, and other business-critical endpoint services.
• Assist with endpoint security controls, including device compliance, encryption, endpoint protection, and security policy troubleshooting.
• Develop and maintain technical documentation, knowledge articles, troubleshooting procedures, and migration runbooks.
• Analyze incident and migration data to identify trends, recurring failures, and opportunities for automation or process improvement.
• Participate in migration waves, cutovers, hypercare, and other scheduled deployment activities, including occasional after-hours support when required.
• Coordinate with vendors and third-party support organizations when escalation outside the internal environment is necessary.
• Ensure incidents and service requests are accurately documented and resolved in accordance with established service management processes.

Required Qualifications

• Requires High School Diploma or equivalent and 2+ years of prior relevant experience
• Require active DoD IAT Level II (i.e. Security+) certification or equivalent prior to start. 
• 5+ years of experience in enterprise IT support, desktop engineering, endpoint management, or service desk operations.
• Demonstrated experience providing Tier 3 / advanced technical support in a large enterprise environment.
• Strong troubleshooting experience with Windows 10/11 endpoints and Microsoft 365.
• Hands-on experience with endpoint management and deployment technologies such as Microsoft Intune, MECM/SCCM, Autopilot, Group Policy, and Active Directory/Entra ID.
• Experience supporting enterprise endpoint migrations, hardware refreshes, operating system upgrades, or large-scale device deployments.
• Strong understanding of networking fundamentals including DNS, DHCP, TCP/IP, VPN, Wi-Fi, and authentication.
• Experience troubleshooting endpoint applications, drivers, peripherals, certificates, profiles, and system configuration.
• Ability to analyze logs and system information to isolate complex technical issues.
• Strong incident management, problem management, and root-cause analysis skills.
• Excellent written and verbal communication skills.
• Ability to work independently while collaborating effectively across technical teams.

Preferred Qualifications

• Experience supporting large-scale Windows 11 migrations or enterprise device modernization programs.
• Experience with Microsoft Autopilot and modern endpoint management.
• Experience with PowerShell scripting and endpoint automation.
• Familiarity with Microsoft Entra ID, Conditional Access, Defender for Endpoint, BitLocker, and endpoint compliance.
• ITIL certification or experience working within an ITIL-based service management environment.
• Microsoft certifications related to endpoint administration, Microsoft 365, or Azure.
• Experience working in a project-based migration or transformation environment

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 21, 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 $48,100.00 - $86,950.00

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.