Job Description
Senior Systems Administrator (MSP)
Location: Irvine, CA / Remote
Employment Type: Full-Time
Salary: Up to $120K
About the Role
AppleOne is partnering with a fast-growing Managed Service Provider (MSP) to find a skilled Senior Systems Administrator. This is a hands-on leadership role where you’ll manage client IT environments, lead complex projects, and help organizations navigate evolving security frameworks like CMMC and NIST. If you thrive in a dynamic MSP environment and enjoy solving technical challenges while mentoring others, this is the role for you.
Responsibilities
Manage, maintain, and optimize client IT infrastructure, including servers, networks, cloud platforms (Azure, Microsoft 365), and security solutions.
Lead and execute IT projects from start to finish, such as migrations, deployments, upgrades, and cloud transitions.
Implement and enforce security frameworks (CMMC, NIST, HIPAA, SOC 2) across client environments.
Troubleshoot escalated technical issues (L3) and mentor junior engineers.
Create and maintain detailed documentation for client systems, policies, and procedures.
Collaborate with internal teams and vendors to deliver timely solutions.
Monitor system performance and proactively address vulnerabilities, outages, or compliance gaps.
Requirements
5+ years of experience as a Systems Administrator in an MSP environment (preferred).
Strong expertise in:
Windows Server, Active Directory, Group Policy
Virtualization (VMware, Hyper-V)
Cloud services (Microsoft 365, Azure, Intune)
Firewalls, networking, and endpoint security solutions
Hands-on experience with compliance/security frameworks (CMMC, NIST, HIPAA, or SOC 2).
Proven success managing IT projects from planning to execution.
Excellent problem-solving skills and ability to prioritize multiple tasks.
Strong communication skills with both technical and non-technical stakeholders.
Relevant certifications preferred (CompTIA Security+, Microsoft, CISSP, CISM, or CMMC-related credentials).
Benefits
Competitive salary with performance-based incentives
Training and certification support (CMMC, NIST, and other security-focused programs)
Opportunities for growth within a rapidly scaling MSP
Flexible work environment with onsite/remote options
Health, dental, and vision benefits
Equal Opportunity Employer / Disabled / Protected Veterans
The Know Your Rights poster is available here:
The pay transparency policy is available here:
For temporary assignments lasting 13 weeks or longer, AppleOne is pleased to offer major medical, dental, vision, 401k and any statutory sick pay where required.
We are committed to working with and providing reasonable accommodations to individuals with disabilities. If you need a reasonable accommodation for any part of the employment process, please contact your staffing representative who will reach out to our HR team.
AppleOne participates in the E-Verify program in certain locations as required by law. Learn more about the E-Verify program.
We also consider for employment qualified applicants regardless of criminal histories, consistent with legal requirements, including, if applicable, the City of Los Angeles’ Fair Chance Initiative for Hiring Ordinance. Pursuant to applicable state and municipal Fair Chance Laws and Ordinances, we will consider for employment-qualified applicants with arrest and conviction records, including, if applicable, the San Francisco Fair Chance Ordinance. For Los Angeles, CA applicants: Qualified applications with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act.
Additional Skills
(none specified)
Job Tags
Full time, Temporary work, Flexible hours,