Systems Administrator

Infracore•San Diego, CA

About The Position

Founded in 2003, Infracore provides high-touch, end-to-end IT infrastructure support for mid-sized and enterprise, technology-focused organizations. We combine deep technical expertise with strategic guidance to help our clients scale securely and efficiently to drive performance and resilience. We believe great work starts with great people. Our culture is built on collaboration, continuous growth, and a shared core values of Integrity, Trust, and Commitment , empowering our team to do their best work and grow their careers. We are deeply invested in helping both our clients and our team members succeed. We’re looking for a Systems Administrator who thrives in complex, fast-paced environments and is ready to take ownership of enterprise IT infrastructure across multiple client environments. This is a highly impactful role where you’ll act as a technical leader supporting critical systems, driving projects, mentoring team members, and partnering closely with IT leadership.

Requirements

5+ years of experience in systems administration or enterprise IT
Strong expertise in: Microsoft 365 (Exchange Online, Teams, SharePoint, Intune, Entra ID)
Active Directory (GPOs, OU design, LDAP)
Windows Server (DNS, DHCP, DFS, NPS)
Networking (TCP/IP, DNS, VPNs, routing)
Virtualization (VMware or Hyper-V)
Cloud platforms (Azure)
Backup solutions (e.g., Veeam, Azure Backup)
PowerShell scripting

Nice To Haves

Experience with security tools (Nessus, nmap, etc.)
Knowledge of cybersecurity frameworks (CIS, NIST)
Familiarity with compliance standards (SOX, HIPAA, CCPA, ISO)
Exposure to Linux environments

Responsibilities

Manage and optimize Microsoft 365, Windows Server, Active Directory, and cloud platforms (Azure/AWS)
Maintain enterprise systems (SAN, firewalls, virtualization, networking)
Perform ongoing maintenance (patching, backups, upgrades, monitoring)
Implement high-availability and redundancy solutions
Lead 1–2 concurrent IT infrastructure projects (migrations, deployments, office moves)
Support IT Managers/Directors with planning, execution, and resource coordination
Contribute to system standardization and improvement initiatives
Serve as the highest level of technical escalation
Troubleshoot complex system and network issues
Work directly with vendors and stakeholders during critical incidents
Champion cybersecurity best practices (MFA, least privilege, monitoring)
Conduct risk assessments and support compliance initiatives (CIS, NIST, etc.)
Provide input into IT strategy, budgeting, and optimization
Build strong relationships with clients and internal teams
Mentor junior IT staff and support training efforts
Participate in a collaborative, high-accountability culture