REQUIREMENTS: • Bachelor's degree and a minimum of 10 years of related experience (a Master's degree with 8 years of related experience, or an additional 4 years of related experience in lieu of a degree, may be substituted). • Must have an Active Top Secret Clearance with SCI eligibility (favorably adjudicated T5/T5R) to start. • Must be within investigation scope and/or currently enrolled in Continuous Evaluation / Continuous Vetting. • Must possess and maintain a current DoD 8570/8140 IAT Level III baseline certification (e.g., CASP+ CE, CISSP or Associate, CCNP Security, GCED, or GCIH). • Demonstrated ability to work independently, analyze problems, determine the appropriate course of action, and exercise discretion and independent judgment with limited day-to-day supervision. • Minimum of 10 years of experience in systems or infrastructure engineering for enterprise Windows environments, including lead-engineer responsibility for endpoint or infrastructure programs at 10,000+ device scale. • Expert knowledge of MECM/SCCM and/or Intune architecture, Windows Server, Active Directory, Group Policy, virtualization (VMware/Hyper-V), VDI, and PowerShell automation. • Demonstrated experience designing and leading implementation of lab, pre-production, or digital twin environments and formal test-before-deploy practices. • Experience leading proof-of-concept evaluations, market research, and cost-benefit/ROM development for Government or enterprise decision-makers. • Extensive experience with DISA STIGs, ACAS/Nessus, RMF control implementation, POA&Ms, and eMASS. • Experience leading engineering teams, establishing standards, and executing changes through formal Change Management. • Excellent technical writing, briefing, and stakeholder communication skills; ability to participate in after-hours emergency on-call response.