Senior Systems Administrator

JOB TITLE: Senior Systems Administrator REPORTING TO: Service Operations Manager About Us: Thrive is a rapidly growing technology solutions provider focusing upon Cloud, Cyber Security, Networking, Disaster Recovery and Managed Services. Our corporate culture, engineering talent, customer-centric approach, and focus upon “next generation” services help us stand out amongst our peers. Thrive is on the look-out for individuals who don’t view their weekdays spent at “a job” but rather look to develop valuable skills that ignite their passion and lead to a CAREER. If you’re attracted to a “work hard, play hard” environment, seeking the guidance, training and experience necessary to build a lucrative career, then welcome to THRIVE!! Position Overview Senior System Adminstrators provide remote support across diverse, multi-tenant environments, handling escalated incidents and complex service requests. The role involves advanced troubleshooting, implementing changes, coordinating with other teams, and serving as an escalation point for engineers within the team, while maintaining clear client communication. Thrive seeks technically proficient professionals with strong verbal and written skills, a desire to learn across all aspects of IT, and the ability to thrive in a fast-paced, collaborative environment with broad technical exposure and opportunities for growth. Responsibilities Take technical ownership of assigned clients, including escalated issues, ensuring resolution of infrastructure- and business-critical problems, often coordinating with clients and their vendors. Perform third-level support and advanced troubleshooting for escalated incidents, including network, server, and workstation issues. Evaluate client infrastructure, systems, software, and processes to identify deficiencies and recommend improvements or projects to meet client needs. Lead major incident outages, conduct post-incident reviews, and drive corrective actions, including root cause analysis and documentation. Identify systemic and pervasive issues, perform trend analysis, and implement permanent solutions to prevent future problems. Design and validate multi-tenant solutions, including identity management, networking, security, disaster recovery, zero trust, hybrid AD/Entra, Intune baselines, conditional access, identity governance, complex networking/firewall policies, SASE/SWG, and SIEM integrations. Benchmark, tune, and optimize systems for performance, capacity, and scalability. Create and maintain documentation, network diagrams, change control approvals, and knowledge base content; write and review changes for complex tasks following established processes and industry best practices. Develop and maintain automation and operational tools, including PowerShell modules, RMM policies, deployment pipelines, compliance checks, and monitoring improvements. Deliver training, mentor junior engineers, and contribute to team readiness and process improvement initiatives. Required Qualifications 7+ years in IT operations/engineering with MSP or large enterprise experience. Expertise in identity, networking, cloud, security, and automation. Deep experience with Windows Server, Active Directory, Azure AD/Entra, Exchange/M365 admin, Intune, and SharePoint. Proven leadership in major incidents and complex transformations. Strong documentation and stakeholder communication; executive-ready briefings. Excellent written and verbal communication, documentation, and time-management skills. Ability to work independently and collaboratively in a team environment. Availability to work after hours or participate in on-call rotations as required. Excellent customer service skills Optional Qualifications: Willingness to visit nearby client sites when necessary, with the understanding that on-site visits may not always be required. Preferred Certifications Microsoft Certified: Cybersecurity Architect (SC-100) / Identity and Access Administrator (SC-300), Azure Solutions Architect (AZ-305) Cisco CCNP/ENARSI Fortinet NSE Palo Alto PCNSE ITIL v4 Leader/Strategist.