Senior IT Systems Administrator - Onsite Security Lead

Quantum ePay™; Anaheim (CA); On-site; USD 85,000 - 105,000; Full time

Benefits offered by this job

Medical, dental, vision

401k with company match

Profit sharing

Flex PTO

Job summary

Quantum ePay is looking for a Senior Systems Administrator to own and strengthen our internal IT environment, infrastructure, and security operations. You will work directly with the Chief Engineering Officer as the senior onsite IT resource for employees, systems administration, escalations, and internal technology improvements.

This role will manage Microsoft 365, Active Directory, endpoint security, backups, and network basics, while supporting onboarding, asset tracking, and documented IT

Qualifications

• 5+ years of experience in systems administration or a closely related IT role.
• Strong experience with Microsoft 365, Active Directory, Windows environments, and endpoint support.
• Solid understanding of security best practices including MFA, least privilege, and incident response.

Responsibilities

• Manage and maintain company IT systems, user accounts, access permissions, hardware, software, and internal technology tools.
• Administer Microsoft 365, Active Directory, email, MFA, shared drives, security groups, and other business systems
• Support onboarding and offboarding from an IT perspective, including account setup and equipment preparation
• Serve as escalation point for Desktop Support Technician and assist with complex technical issues
• Maintain endpoints and perform patching, backups, and device security monitoring
• Monitor system performance, troubleshoot outages, and resolve service interruptions
• Provide basic network support including DNS, DHCP, VPN, and firewalls
• Document IT procedures and onboarding/offboarding checklists
• Coordinate with vendors and the Chief Engineering Officer on IT priorities

Skills

Systems administration

Windows OS

Microsoft 365

Active Directory

Security awareness

Documentation

Onsite support

Networking basics

Vendor coordination

Communication

Tools

PowerShell

EDR tools

SIEM

Job description

Quantum ePay is looking for a Senior Systems Administrator to own and strengthen our internal IT environment, infrastructure, and security operations. You will work directly with the Chief Engineering Officer as the senior onsite IT resource for employees, systems administration, escalations, and internal technology improvements.

This role will manage Microsoft 365, Active Directory, endpoint security, backups, and network basics, while supporting onboarding, asset tracking, and documented IT