Jonathan Rosner

• Deployed 200+ Windows servers (VMware & Hyper-V), cutting provisioning time by 25%.
• Achieved 98% patch compliance via Tanium Cloud; reduced security gaps by 30%.
• Centralized Entra ID/Intune/365 management: implemented MFA/SSO and RBAC, onboarding 150+ users—boosted provisioning speed by 40%.
• Partnered with vendors to resolve high-severity incidents 20% faster; root-cause analyses slashed recurrences by 40%.
• Monitored infrastructure health (Dynatrace/Tanium), eliminated performance bottlenecks—downtime down 25%.
• Drove SSL rollout across 50+ IIS web servers; prevented certificate outages (95% fewer incidents).
• Secured DNS operations and remediated vulnerabilities, cutting audit findings by 30%.
• Authored runbooks & SOPs; trimmed escalations to Tier 3 by 50%.

• Engineered Windows virtual environments (Hyper-V & VMware), supporting 300+ VMs.
• Assembled/configured SuperMicro servers: RAID arrays, BIOS tuning—improved server throughput by 20%.
• Built secure networks & VPNs (SonicWALL), raising perimeter security posture.
• Managed Google Workspace and Exchange Online; enforced DLP, anti-malware, and retention policies for 1,200 mailboxes.
• Automated backups and DR tests via Datto Cloud—cut recovery time objectives by 50%.
• Resolved 30–35 Tier II/III tickets weekly; lifted first-call resolution from 60% to 90%.
• Led hardware/software upgrade initiatives; mentored Level I techs and documented SOP library.