Microsoft Systems Administrator, Senior

Advanced Systems Design is seeking a
Microsoft Systems Administrator, Senior for our client located in Montgomery, AL.

This position is onsite in Montgomery, AL, and requires in-person availability starting day 1.

We are seeking a Senior Microsoft Systems Administrator to lead a project to harden Windows servers and workstations in compliance with NIST SP 800-53 security controls. This role focuses on implementing configuration baselines, enforcing access controls, and continuous monitoring. This position requires strong technical expertise in Microsoft technologies combined with practical knowledge of cybersecurity standards.

• Install, configure, harden, patch, and maintain Windows Server (2019/2022+) and Windows 10/11 workstations in accordance with NIST SP 800-53 Rev. 5 controls.
• Implement and validate security controls across families including Access Control (AC), Configuration Management (CM), Identification & Authentication (IA), Audit & Accountability (AU), System & Communications Protection (SC), and others relevant to endpoint/server platforms.
• Manage Group Policy Objects (GPOs), security baselines, and Intune/Microsoft Endpoint Manager policies to enforce 800-53-aligned configurations (e.g., password policies, account lockout, least privilege, firewall rules, App Locker, Bit Locker).
• Perform hardening tasks including:
  • Enforcing deny-by-default/allow-by-exception execution policies
  • Configuring host-based firewalls and intrusion detection/prevention
  • Implementing multi-factor authentication and privileged account management
  • Enabling cryptographic protections for data at rest/transit
  • Removing unnecessary services, features, and default accounts
• Administer Microsoft tools for compliance:
  Active Directory, Microsoft Endpoint Configuration Manager (SCCM/MECM), Microsoft Intune, Azure AD/Entra , Defender for Endpoint, and Azure Policy (where hybrid/cloud-integrated).
• Document system security plans (SSP), control implementation details, POA&Ms, and evidence for NIST 800-53 controls during the project.
• Develop Power Shell scripts for automation of compliance checks and reporting

• 4+ years of hands‑on experience administering Windows servers and workstations in enterprise environments.
• Demonstrated experience implementing NIST SP 800-53 security controls on Microsoft platforms.
• Proficiency with Microsoft administration tools:
  Active Directory, Group Policy, Power Shell, SCCM/MECM, Intune, Defender suite.
• Understanding of key 800-53 control families as applied to endpoints/servers (AC, AU, CM, IA, SC, SI, etc.).
• Experience with hardening techniques, baseline configuration management, and least‑privilege principles.
• Familiarity with compliance tools (Nessus/Tenable or similar).
• Strong scripting skills (Power Shell preferred) for automation and compliance checks.
• US citizenship is required

• Relevant certifications:
  • Microsoft:
    Microsoft Certified:
    Windows Server Hybrid Administrator Associate, Endpoint Administrator, or equivalent.
  • Security/Compliance:
    CompTIA Security+, CISM, or CAP.
• Hands‑on work with Azure AD/Entra , Microsoft Defender for Endpoint compliance policies, or Azure Policy for NIST mappings.
• Knowledge of related standards (NIST 800-171, CMMC, FISMA).

• Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, or related field (or equivalent experience).

• A leading Information Technology provider for Federal, State & Local government agencies.
• A certified minority‑owned small business government contractor with capabilities related to Public Health IT, Criminal Justice, Transportation, and Defense.
• A certified service‑disabled veteran‑owned company with a proud 46‑year track record of providing successful innovative solutions for our government customers.
• A drug‑free workplace in accordance with the Drug‑Free Workplace Act of 1988.
• Applicants who have a signed offer of employment or contractor agreement are subject to:
  • the pre‑employment testing protocol:
    • background investigation
    • drug screening

• Are actively working on next‑generation technology projects…