Senior Systems Administrator

The Senior Systems Administrator is a senior technical individual contributor responsible for the design, deployment, support, and continuous improvement of client IT environments within a Managed Services Provider (MSP) model. This role serves as an escalation point for complex systems and networking issues, supports client onboarding and presales efforts, and provides technical leadership to service desk and advanced support teams. This position operates in a fast‑paced, multi‑client environment and requires strong technical expertise, excellent communication skills, and the ability to balance reactive support, proactive engineering, and project work while meeting defined SLAs. This role includes technical leadership responsibilities but does not include direct people management. At Zirrus, we believe great technology starts with great people. You'll work alongside experienced professionals in a collaborative, fast‑moving environment where your expertise is valued and your growth is supported. We invest in our team so they can focus on doing their best work—without unnecessary friction. Taste of What You'll Do Act as a senior escalation point for advanced systems, networking, and infrastructure incidents and problems.

Own incidents and problems from escalation through root cause analysis and resolution, coordinating with Service Desk, vendors, and internal teams as needed. Perform advanced administration and support of Windows Server, Linux, virtualization, networking, storage, backup, and security platforms. Actively respond to and remediate alerts generated by RMM and network monitoring systems; continuously improve monitoring and alerting to meet or exceed SLAs. Participate in a rotating on‑call schedule and provide after‑hours support as required. What We're Looking For 5+ years of systems and/or network administration experience, with at least 2+ years in a senior escalation role. Experience supporting multiple client environments in a Managed Services Provider or similar environment preferred. Bachelor's degree in IT, relevant certifications, or equivalent hands‑on experience.

Demonstrated experience with:

Microsoft 365 administration and migrations On‑prem to cloud migrations (Exchange, infrastructure) Enterprise networking (routing, switching, firewalls, Wi‑Fi) Azure infrastructure design and management Experience working in an ITIL‑aligned team preferred. Azure Solutions Architect or other industry‑recognized certifications preferred. Valid driver's license required. Why Work at Zirrus Outstanding Medical Coverage - No deductible and no co‑pay 401(k) with up to 9% company match Work with modern technologies in a collaborative, professional environment Opportunity to make a real impact across client and internal systems Competitive Salaries