Onsite Senior IT Systems Administrator – Security & Growth

Quantum Electronic Payments LLC; Anaheim (CA); On-site; USD 85,000 - 105,000; Full time

Benefits offered by this job

Profit sharing

Flexible PTO

401k with company match

Medical, dental, vision

Job summary

Quantum Electronic Payments LLC seeks a Senior Systems Administrator to lead and manage our on-site IT environment in Anaheim Hills. You will own Microsoft 365, Active Directory, networking, and security operations, ensuring reliable access, devices, and documentation for all employees.

The role demands hands-on troubleshooting, strong communication, and the ability to drive IT process improvements in a fast-growing fintech setting with a collaborative CTO and IT team.

Qualifications

• 5+ years of experience in systems administration or similar role.
• Strong experience with Microsoft 365, Active Directory, Windows environments, user access management, and endpoint support.
• Working knowledge of networking concepts including DNS, DHCP, VPN, firewalls, switches, and wireless networks.
• Ability to troubleshoot technical issues independently and communicate updates clearly.

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, access provisioning, equipment preparation, and access removal
• Serve as an escalation point for the Desktop Support Technician and assist with more complex technical issues
• Support laptops, desktops, printers, phones, conference room equipment, VPN access, and other onsite technology needs
• Monitor system performance, troubleshoot issues, and help resolve outages or service interruptions
• Maintain endpoint security, patching, device compliance, antivirus/EDR tools, and system updates
• Support network equipment and basic network troubleshooting, including firewalls, switches, wireless access points, DNS, DHCP, and VPN
• Maintain backups, disaster recovery procedures, and business continuity documentation
• Track IT assets, licenses, equipment inventory, and system documentation
• Create and maintain IT procedures, troubleshooting guides, onboarding/offboarding checklists, and internal support documentation
• Coordinate with vendors and service providers as needed
• Partner with the Chief Engineering Officer on IT priorities, security improvements, system upgrades, and internal technology projects
• Identify opportunities to improve IT processes, reduce recurring issues, and strengthen system reliability and security

Skills

Microsoft 365

Active Directory

Windows OS

Networking basics

Endpoint management

Security best practices

Technical documentation

Communication skills

PowerShell scripting

Tools

PowerShell

Job description

Quantum Electronic Payments LLC seeks a Senior Systems Administrator to lead and manage our on-site IT environment in Anaheim Hills. You will own Microsoft 365, Active Directory, networking, and security operations, ensuring reliable access, devices, and documentation for all employees.

The role demands hands-on troubleshooting, strong communication, and the ability to drive IT process improvements in a fast-growing fintech setting with a collaborative CTO and IT team.