Senior Systems Administrator
On-siteTulsa, Oklahoma, United States
Job Summary
Serve as the Level 3 escalation point for the US Help Desk, owning complex incidents beyond Level 1/2 scope and acting as the resolver of last resort across US sites. Administer core server infrastructure including Windows Server, Active Directory, DNS, DHCP, file/print services, and virtualization platforms while designing, configuring, and monitoring enterprise network infrastructure across US locations. Lead root cause analysis for major incidents, document findings, and drive permanent fixes through to completion. Plan and execute infrastructure changes, upgrades, and migrations during scheduled maintenance windows, including out-of-hours work as needed. Participate in a shared on-call rotation for critical incidents impacting US offices and escalations from global teams. Partner with global IT teams on cross-region projects, standards, and architecture decisions, and mentor Level 1 and Level 2 technicians by developing runbooks and contributing high-quality content to the knowledge base.
Required Qualifications
- Bachelor's degree in Information Technology, Computer Science or a related field, or equivalent professional experience
- 7–10 years in IT support or systems administration, including demonstrable time at a Level 3 / senior escalation level supporting business-critical infrastructure
- Deep, hands-on expertise across Windows Server, Active Directory, Group Policy, Microsoft 365, Azure / Entra ID, enterprise networking (TCP/IP, routing and switching, VLANs, firewalls, VPN, Wi-Fi), endpoint management (Intune / MDM), virtualization (Hyper-V or VMware) and endpoint security (EDR, MFA, conditional access, patching)
- Excellent written and verbal communication; able to translate complex technical issues for non-technical stakeholders, write clear runbooks and lead incident bridges with confidence
- Ability to manage multiple priorities in a fast-paced environment, owning complex incidents end-to-end while balancing project work and mentoring of junior staff
- Willingness to participate in a shared on-call rotation and perform occasional after-hours work for scheduled maintenance windows
Desired Qualifications
- Industry certifications such as Cisco CCNA / CCNP, Microsoft AZ-104 / AZ-305 / MS-100, CompTIA Network+ / Security+, or ITIL Foundation
- Scripting and automation experience (PowerShell, Bash, Python) and familiarity with infrastructure-as-code tooling (e.g. Terraform, Ansible)
- Experience supporting multi-site or global environments using RMM / PSA tooling (e.g. NinjaOne, ConnectWise Automate, ConnectWise Manage) and documentation platforms such as IT Glue
Hiring someone like this?
Get your role in front of qualified candidates on Sorce.