Senior Security Administrator Jobs in Reston, VA

Summary The MIL Corporation is seeking a Senior Microsoft Cloud Engineer (Computer Engineering, Senior Associate) to support a Federal government client. The Senior Microsoft Cloud Engineer provides advanced engineering, operational, and advisory support across Microsoft 365, Azure, and Microsoft Security platforms. This role ensures the reliability, scalability, security, and compliance of enterprise Microsoft cloud environments through expert-level design, implementation, optimization, and maintenance aligned with NIST SP 800-53, NIST SP 800-207 (Zero Trust), and FedRAMP Moderate requirements. This position currently requires an on-site schedule. Schedule is subject to change based on company/contract requirements. Must perform change operations during off-hours as needed, with approvals required for any changes causing disruptions during core business hours. This position is currently unfunded and is being posted in anticipation of a future contract award and funding approval. We are proactively identifying and engaging with qualified candidates. While candidates may be contacted for pre-screening, any hiring decisions will be contingent upon funding availability and final program requirements or client approval. Responsibilities Microsoft Cloud Platform Engineering * Design, implement, operate, and optimize Microsoft 365, Azure, and Microsoft Security services to ensure performance, scalability, and mission alignment. * Provide Azure infrastructure and application support, including networking, workload configuration, maintenance, troubleshooting, and hybrid environment integration. Security Architecture & Zero Trust * Implement and maintain cloud security controls aligned with NIST SP 800-53, NIST SP 800-207, and FedRAMP Moderate. * Apply Zero Trust principles including least privilege, continuous verification, conditional access, and privileged access management. * Configure and manage Microsoft Defender, Sentinel, and Purview to support threat protection, governance, information protection, and incident response readiness. * Manage and monitor Sentinel data sources and log ingestion quality. Identity & Access Management * Administer and secure Microsoft Entra ID, including Conditional Access, privileged access controls, and hybrid identity architectures. * Implement MFA provider transitions, 3rd-party MFA integration, Smart Card, and FIDO-based authentication across Windows and macOS. Collaboration & Messaging Services * Manage and support Exchange Online, Microsoft Teams, SharePoint Online, and related Microsoft 365 workloads, ensuring availability, security, and compliance. * Perform advanced administrative tasks including headless Exchange Online provisioning and SharePoint user profile imports using secure PowerShell and Graph API operations. Endpoint & Device Management * Create and manage Windows, macOS, and iOS devices via Intune, including compliance policies, configuration profiles, and endpoint security. * Build, configure, and operate Autopilot image delivery pipelines and software deployment for enterprises of 700+ endpoints. Operational Governance & Documentation * Support formal change management processes and maintain technical documentation, SOPs, training materials, and architectural diagrams. * Implement automated reporting and dashboards using Power BI-covering system health, compliance, cost forecasting, utilization, and budget tracking. * Set up Azure spending budgets with monitoring, alerting, and forecasting to prevent cost overruns. Incident Response & Continuity * Develop and implement incident response and disaster recovery playbooks integrated with organizational COOP and IR documentation. Technical Leadership & Collaboration * Serve as a senior advisor to engineering, cybersecurity, and cloud operations teams. * Provide expert guidance during audits, assessments, compliance reviews, and resolution of complex technical issues. * Exercise independent judgment with minimal supervision to maintain secure, resilient, and compliant cloud environments. Required Qualifications * 10+ years of professional work experience * All below certifications must be current and maintained for at least five years - * Microsoft 365 Certified: Administrator Expert * Microsoft Certified: Cybersecurity Architect Expert * Microsoft Certified: Azure Solutions Architect Expert * Microsoft 365 Certified: Endpoint Administrator Associate * Microsoft Certified: Identity and Access Administrator Associate * Microsoft Certified: Windows Server Hybrid Administrator Associate * Microsoft 365 Certified: Teams Administrator Associate * Microsoft Certified: Information Security Administrator Associate Desired Qualifications * Expert-level knowledge of Microsoft Azure and Microsoft M365 environments Education Bachelor's degree or equivalent working experience Clearance N/A Compensation The MIL Corporation values your contributions and offers a range of benefits to support your overall well-being. We are pleased to offer a comprehensive range of benefits to our full-time employees which include health, life, disability, and retirement plans, as well as paid time off, opportunities for professional growth and tuition assistance. Additional benefits and incentives may also apply, which will be communicated during the hiring process. For this position, the projected compensation range is $195,000 - $215,000 per year. This estimate represents the typical salary range and is just one part of MIL's complete compensation package. Final salary for this position is determined based on factors such as individual qualifications, education, experience, and contractual limitations. Learn more on the MIL Careers page. Why MIL? The MIL Corporation (MIL) is a dynamic workforce of industry professionals who deliver world-class solutions in cyber, engineering, financial management, and information technology - and we are looking for candidates like you! MIL offers opportunities for professionals at all stages of their careers, from early-career candidates to experienced industry professionals. We are known for a collaborative, people-first culture where employees are supported, valued, and encouraged to grow. This commitment to our people and our work is reflected in the industry and workplace awards MIL has received over the years. * 2021 - 2024, Top Workplaces USA award (Energage) * 2017 - 2025 Top Workplaces Award, Greater Washington Area (The Washington Post) * 2018 - 2025 Certified Great Workplace, Great Place to Work® * 2021 - 2025, Best Workplaces in Consulting & Professional Services™ * 2021 Fortune Best Workplaces for Millennials™ * 2018 Fortune, Great Place to Work: Best Place to Work for Diversity * 2017, 2020 - 2025 Top Workplace Award, South Carolina (Greenville Business Magazine, Columbia Business Monthly, and Charleston Business Magazine) * 2025 Corporate Partnership Award, Association of Fundraising Professionals, Maryland Chapter * 2025 Moxie Award, GovCon Category * 2024 Patriot Award, Employer Support of the Guard and Reserve (ESGR), Department of Defense * 2022 Freedom Award, Employer Support of the Guard and Reserve (ESGR), Department of Defense * 2018, Above & Beyond Award, Employer Support of the Guard and Reserve (ESGR), Department of Defense If your goal is to help the federal government deploy leading technologies, improve financial management, or defend the nation in cyberspace, MIL welcomes you. Become a part of something greater, where you, the people, make the difference. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected veteran status or other characteristics protected by state or federal law.