**ManTech** seeks a driven and experienced **Senior Windows Engineer** to join our team in **Herndon, VA** . This role is ideal for a technology professional who thrives in secure, mission-critical environments and is passionate about delivering robust Windows-based infrastructure solutions. The successful candidate will play a pivotal role in the architecture, deployment, and sustainment of systems that align with federal IT and cybersecurity standards, including FISMA, FedRAMP, and DoD compliance frameworks. **Key Responsibilities** + Design, implement, and maintain scalable Windows Server environments (2016, 2019, 2022). + Administer and troubleshoot Active Directory, DNS, DHCP, Group Policy Objects (GPOs), and Windows Clustering. + Automate operational processes using PowerShell scripting. + Apply system hardening in accordance with DISA STIGs and NIST 800-53 security controls. + Perform patching, updates, and maintenance on Windows servers and workstations within secure networks. + Support virtualized infrastructure using Hyper-V and VMware; integrate with cloud services such as Azure and AWS GovCloud. + Partner with cybersecurity teams on vulnerability management, incident response, and compliance audits. + Participate in configuration and change management processes. + Develop and maintain technical documentation, diagrams, and Standard Operating Procedures (SOPs). **Basic Qualifications** + Bachelor’s degree in Information Technology, Computer Science, or a related field _OR_ 4+ years of additional experience in lieu of a degree + 7+ years of experience in Windows engineering or systems administration + Proven expertise in: + Windows Server (2016/2019/2022) + Active Directory in complex environments (e.g., multi-domain forests) + PowerShell scripting and automation + Group Policy design and troubleshooting + Familiarity with compliance frameworks such as **NIST** , **FISMA** , **FedRAMP** , and **RMF** + Solid understanding of networking principles and enterprise security integration **Preferred Qualifications** + Microsoft Certified: Windows Server Hybrid Administrator Associate (or equivalent certification) + Experience with: + Azure AD, Azure Government, or AWS GovCloud + Public Key Infrastructure (PKI) + Endpoint management tools like SCCM/MECM or Microsoft Intune + VMware ESXi and vSphere virtualization platforms + Background working with DoD or other federal agencies **Security Clearance Requirements** + Must be a U.S. citizen residing in the contiguous United States + Must be eligible to obtain and maintain a government security clearance **Physical Requirements** + Ability to remain seated or standing for prolonged periods (approximately 50% of the time) + Occasional movement within the office for accessing equipment or files + Regular communication with team members, managers, and clients, including presentation delivery and the exchange of technical information ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.