Onni Group of Companies

Senior Systems Administrator

Onni Group of Companies

full-time

Posted on:

Location Type: Office

Location: Los Angeles • California, Illinois, Washington • 🇺🇸 United States

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Salary

💰 $100,000 - $120,000 per year

Job Level

Senior

Tech Stack

CloudDNSTCP/IPVMware

About the role

  • Take ownership of escalations from Tier 1–2 and drive issues to resolution with strong client communication
  • Troubleshoot complex problems across servers, identity, cloud services, networking, security, endpoints, and line-of-business applications
  • Perform structured root-cause analysis and implement permanent fixes (not just workarounds)
  • Administer and improve client environments (typical MSP scope): Microsoft 365, identity, endpoint management, servers/virtualization, backups, and core networking
  • Implement proactive maintenance, monitoring improvements, and security hardening aligned to best practices
  • Support lifecycle initiatives: patching, renewals, onboarding/offboarding, migrations, and standardization
  • Maintain excellent ticket hygiene: clear notes, time entries, documentation, and closure summaries in the PSA
  • Create and maintain internal KB articles, SOPs, and runbooks
  • Identify recurring pain points and propose/execute automation or process improvements
  • Coach and mentor technicians (technical skills, troubleshooting approach, documentation quality)
  • Collaborate with Service Manager/dispatch to prioritize effectively during high-volume periods
  • Participate in an after-hours escalation rotation and support critical incidents when needed

Requirements

  • 5+ years in IT support, with significant time in Tier 3 / escalation or Senior SysAdmin responsibilities (MSP experience strongly preferred)
  • Strong troubleshooting skills across Microsoft-centric environments: Windows Server administration, Active Directory / Entra ID concepts
  • Microsoft 365 administration (Exchange Online, SharePoint/Teams fundamentals)
  • Solid networking fundamentals (TCP/IP, DNS/DHCP, VPN, VLANs, firewall concepts)
  • Experience with virtualization (VMware or Hyper-V) and backup/DR concepts
  • Scripting/automation mindset (PowerShell preferred)
  • Strong written communication and client-facing professionalism
Benefits
  • 3 weeks PTO
  • Annual education allowance of up to $1,000
  • Referral program
  • Residential housing discount after 1 year of continuous employment
  • Friends and family rates for our Hotel Properties throughout the company
  • Competitive pay
  • Health Saving Account
  • Flexible Saving Account
  • Employee Assistance Program
  • Annual Education Allowance
  • Generous Referral Program
  • Fun and collaborative company culture with lots of team-building events
  • Discounted hotel stays in multiple locations through our Hospitality brand

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
troubleshootingroot-cause analysisMicrosoft 365 administrationWindows Server administrationActive Directorynetworking fundamentalsvirtualizationscriptingautomationbackup/DR concepts
Soft skills
client communicationcoachingmentoringdocumentation qualitycollaborationprioritizationproblem-solvingprofessionalismclear notesticket hygiene