Network & Systems Administrator — Secure, Scalable IT Infra

Jobtailor; Chevy Chase (MD); On-site; USD 110,000 - 165,000; Full time

Job summary

Lynk is seeking a Network Engineer to design, deploy, and secure our LAN/WAN, VPN, and firewall infrastructure across multiple locations in the United States. You will lead architecture decisions and ensure systems are hardened per ITAR and NIST SP 800-171 standards.

Responsibilities include managing Entra ID/Azure AD, Intune, Defender, and endpoint policy, while enabling compliance and incident response. Hybrid coordination with security teams is required.

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).

Responsibilities

• 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.
• 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.
• Deploy, monitor, and maintain security posture via Microsoft Defender (Endpoint/365) — threat detection, alerting, and remediation.
• Monitor network and infrastructure health; lead incident response and root-cause analysis for outages and performance issues.
• 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.
• 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.
• Serve as a secondary/escalation point of contact for basic end-user technical issues (hardware, software, connectivity, account access).
• Provision and configure end-user hardware (laptops, peripherals) in line with security and compliance baselines.
• Troubleshoot common Windows/macOS and Office 365 issues for staff as needed.
• Support onboarding/offboarding from an infrastructure and access-management perspective (accounts, device enrollment, permissions).

Skills

LAN/WAN Design

VPN Configuration

Firewall Management

Windows Server Administration

MacOS Administration

Endpoint Compliance Management

Network Segmentation

Patch Management

Incident Response

Documentation

Tools

Microsoft Defender

ESET

NinjaOne

ManageEngine

Office 365

DNS/DHCP

MFA

Endpoint Protection

Disaster Recovery

Business Continuity

Job description

Lynk is seeking a Network Engineer to design, deploy, and secure our LAN/WAN, VPN, and firewall infrastructure across multiple locations in the United States. You will lead architecture decisions and ensure systems are hardened per ITAR and NIST SP 800-171 standards.

Responsibilities include managing Entra ID/Azure AD, Intune, Defender, and endpoint policy, while enabling compliance and incident response. Hybrid coordination with security teams is required.