Senior System Administrator (Managed Services) (Fullerton)

Senior System Administrator (Managed Services)

A fast-growing MSP is seeking a Senior System Administrator to support and modernize client environments in the Anaheim and Buena Park area. This role is fully hands-on across Microsoft 365, Azure Entra ID, Windows Server, and networking. You will serve as the onsite technical expert, resolving issues at the root, deploying new solutions, maintaining standards, and ensuring systems remain secure and stable.

What You Will Do

Support and optimize Microsoft 365, Azure Entra ID, Windows Server, and endpoint systems

Deploy new hardware, software, cloud services, and security configurations

Perform monthly proactive maintenance, technical audits, and environment hardening

Troubleshoot networking issues including switching, wireless, and firewall basics

Document client environments and maintain accurate technical records

Identify recurring issues and drive long-term resolutions with internal teams

Communicate clearly onsite and represent the MSP with professionalism

What You Bring

Five or more years of IT experience

MSP experience required, with confidence working independently at client sites

Strong skills across Microsoft 365, Azure Entra ID, Windows Server, and networking fundamentals

Experience deploying and troubleshooting desktops, servers, cloud services, and security tools

Familiarity with PSA and RMM tools such as ConnectWise

Strong communication and documentation skills

Preferred Certifications

Azure Fundamentals

Modern Desktop Administrator

CompTIA A Plus or Network Plus

ITIL Foundation

Benefits

Health, dental, and vision insurance

Life insurance

Short and long term disability options

Flexible Spending Account

PTO and paid holidays

401(k) with company match

Company laptop

Cellphone reimbursement

Certification reimbursement with salary increases for every passed certification