Systems Administrator - Cloud & Network Infrastructure

Job Title: Systems Administrator - Cloud & Network Infrastructure

Location: Brea, CA

Duration: Direct Hire

Salary: $95K to $125K

Shift: 1 st Shift

Position Summary

We are seeking a Systems Administrator with strong Azure and networking expertise.

Key Responsibilities

• Own and mature our Azure cloud environment: architecture, storage, identity (Entra ID), governance, cost management, and security posture
• Lead cloud migration and hybrid-cloud integration efforts for on-prem workloads where appropriate
• Implement and enforce cloud security configuration, CA policy, Defender security tooling, monitoring and logging.
• Intune configurations, package deployment, and endpoint management
• Maintain monitoring, backup/DR, and patch/configuration management practices for cloud-hosted systems.
• Use AI, copilot, and PowerShell to automate repetitive administration and security tasks

Network Architecture

• Design, document, and continuously improve network architecture, including segmentation between CUI-scoped enclaves and general business networks

• Manage firewall, VLAN, and ACL configurations (including CUI subnet access control lists) and maintain accurate network documentation/diagrams
• Lead network hardening initiatives and access control requirements (e.g., AC, SC control families)
• Evaluate and implement zero-trust and micro-segmentation strategies

General Systems Administration

• Administer Windows Server, Active Directory/Entra ID, endpoint management, and core virtual infrastructure services

• Participate in security assessments, incident response testing, risk assessments, and 3rd party audits
• Execute vulnerability scans, system patching, configuration deployments
• Support configuration and software management controls (e.g., application allow[1]listing, nonessential functionality restrictions) in coordination with compliance staff.
• Participate in change management processes for IT systems affecting CUI/classified scope.
• Prioritize and resolve escalated technical issues and mentor junior IT staff, manage ticketing systems, and address chronic or persistent issues.
• Own and support all critical security incidents, interruptions/outages, and end-user issues with flexible evening/weekend work when required
• Maintain system documentation, diagrams, project plans, asset inventory

Required Qualifications

• Hands-on expertise in hybrid cloud migration, Microsoft Azure networking, cloud technologies, protocols, and authentication, and WAN network architecture

• Experience administering Azure: identity (Entra ID), virtual machines, vnet, CA policy, Azure Foundry, Purview, Defender, Intune, etc.
• Design and manage basic network architecture: routing, switching, segmentation, firewall/ACL configuration, VLANs, RADIUS, etc.
• Excellent writing skills, conceptual thinking skills, and communication skills needed to learn/implement GenAI tools
• Active Secret security clearance
• CompTIA Security+ (CE)

Preferred Qualifications

• Cloud or Microsoft Azure Certifications
• Experience with cybersecurity compliance frameworks similar to CMMC/NIST 800-171

• Implementing simple AI solutions in Azure Foundry and/or Copilot
• Strong PowerShell skills

Work Environment

• On-site role
• Some after-hours/on-call availability required to support maintenance windows and incident response