IT Infrastructure & Systems Administrator

Duties & Responsibilities

• Administer and harden core infrastructure: Microsoft Entra ID (Azure AD), Conditional Access, DNS/DHCP, Office 365, and endpoint security (ESET, Microsoft Defender) at the systems-administration level
• Manage endpoint and device compliance through Microsoft Intune and MDM platforms (e.g., NinjaOne), including policy design, patch management, and fleet-wide enforcement
• Implement and maintain infrastructure security controls (firewalls, MFA, network segmentation, endpoint protection) in line with ITAR and export-control obligations
• Support Lynk's CMMC Level 2 compliance program — maintain endpoint compliance (patching, configuration baselines, encryption, access control) across the device fleet and evidence controls for audits
• Monitor and remediate endpoint compliance drift via Intune/NinjaOne and Microsoft Defender to keep the environment aligned with NIST SP 800-171 control requirements
• Design, deploy, and maintain LAN/WAN, wireless, VPN, and firewall infrastructure across Lynk office and lab locations
• Own network architecture decisions — segmentation, routing, VLANs, redundancy, and capacity planning as the company scales
• Deploy, monitor, and maintain security posture via Microsoft Defender (Endpoint/365) — threat detection, alerting, and remediation
• Manage server infrastructure (physical and virtual), including provisioning, patching, backup, and lifecycle management
• Monitor network and infrastructure health; lead incident response and root-cause analysis for outages and performance issues
• Partner with security/compliance stakeholders on System Security Plans (SSPs), POA&Ms, and audit readiness for CMMC assessments
• Document network topology, infrastructure architecture, and disaster recovery/business continuity procedures

Basic End-User IT Support

Qualifications

• 4+ years of experience in network engineering, systems administration, or infrastructure management
• Hands-on experience designing and maintaining LAN/WAN, VPN, firewall, and wireless network infrastructure
• Strong Windows Server and macOS environment administration experience
• Experience managing Microsoft Entra ID (Azure AD), Conditional Access, and Office 365 at an administrative/architectural level
• Hands-on experience with Microsoft Intune for device/endpoint management and compliance policy
• Experience with MDM platforms such as NinjaOne, ManageEngine, or similar
• Experience deploying and managing Microsoft Defender (Endpoint/365) or comparable endpoint security/EDR tooling
• Understanding of network security fundamentals: firewalls, segmentation, and endpoint protection
• Familiarity with CMMC Level 2 / NIST SP 800-171 control requirements and experience maintaining endpoint compliance in a regulated environment
• Comfortable providing basic end-user technical support alongside infrastructure duties
• Strong documentation, troubleshooting, and incident-response skills
• Relevant certification preferred (e.g., CompTIA Network+/Security+, CCNA, Microsoft Certified: Intune/Endpoint Manager, or equivalent experience)

Bonus

ITAR Requirements

• To comply with U.S. Government export control regulations (ITAR), applicants must be one of the following: (i) a U.S. citizen or national, (ii) a lawful permanent resident (green card holder), (iii) a refugee under 8 U.S.C. § 1157, or (iv) an asylee under 8 U.S.C. § 1158. Individuals who do not meet these criteria must be eligible to obtain the necessary authorizations from the U.S. Department of State.
• Learn about ITAR here: https://www.pmddtc.state.gov

Job Location

• Chevy Chase, MD — Hybrid (2–3 days onsite/week), with periodic travel to Chantilly, VA