Senior System Administrator

Sr. Systems Administrator

Location: Onsite

Duration: Direct hire

This full-time position will oversee the administration, maintenance and security of a distributed IT infrastructure supporting multiple Microsoft 365 tenants and a geographically dispersed workforce. This role is reponsible for managing both on-site and remote environments across multiple locations and time zones, ensuring operational continuity, regulatory compliance, and enterprise-level security standards. The ideal candidate is a highly analytical, service-oriented IT professional with deep Microsoft 365 expertise and experience operating within regulated environments such as CMMC and NIST 800-171.

Key Responsibilities:

• Microsoft 365 Administration - Administer multiple Microsoft 365 tenants, including Exchange Online, SharePoint Online, Microsoft Teams, Entra ID (Azure AD), Conditional Access Policies; and Multi-Factor Authentication (MFA)
• Manage identity governance, security policies, and tenant configurations
• Perform log reviews and monitor system activity to ensure compliance and security integrity
• Infrastructure & Systems Management - Administer physical and virtual servers across distributed environments
• Manage network infrastructure including firewalls, switches, and remote office connectivity
• Oversee patch management, vulnerability remediation, and endpoint protection
• Provide Tier 2/3 escalation support
• Support and manage Remote Monitoring & Management (RMM) tools
• Administer VoIP systems
• Security & Compliance - Ensure compliance with CMMC Level 1 (or higher), NIST 800-171, and NIST 800-53 (as applicable)
• Conduct internal system compliance reviews and assessments
• Develop and maintain technical documentation and Standard Operating Procedures (SOPs)
• Participate in IT Change Boards and change management processes
• Support audit readiness initiatives
• Physical Security Systems - Oversee IP-based camera systems
• Administer badge readers and access-control systems
• Ensure physical security systems integration with cybersecurity policies
• Collaboration & Strategic Support - Work closely with development teams and systems engineers to support development, testing and deployment
• Participate in disaster recovery planning and business continuity strategies
• Assist with vendor management and contract negotiations

Required Qualifications:

• Ability to obtain and maintain a DoW security clearance (active clearance preferred).
• Bachelor s degree in IT Security, Computer Science, Information Systems Technology, or a related discipline, or equivalent professional experience.
• Minimum of seven years of IT Administration experience, including at least three years in a regulated environment (CMMC level 1 or higher, NIST 800-171, NIST 800-53) .
• Exceptional written and verbal communications skills.
• Strong service orientation and the ability to work independently.
• Advanced analytical and problem-solving abilities.
• Excellent organizational, time management and customer service skills.
• Experience in participating in IT Change Boards and conducting system compliance assessments.
• Experience drafting SOPs to support IT consistency and audit readiness.
• Networking 3 years of experience with firewalls, switches, and physical security hardware.
• Prior experience with vendor management, contract negotiations, disaster recovery planning, and business continuity strategies.
• At least three years of Microsoft 365 Administration experience.

Preferred Qualifications:

• CompTIA Security (Active or ability to obtain)
• Microsoft 365 Certified Administrator
• CCNA Certification

"Equal Opportunity Employer/Veterans/Disabled"