Fred Johnston

Strategic IT Systems Engineer and Infrastructure Leader with over 28 years of experience designing, securing, and managing enterprise IT environments. Proven expertise in Windows Server architecture, Active Directory domain services, VMware vSphere virtualization, and multi-site network infrastructure. Adept at driving operational excellence, automating workflows via PowerShell, and leading complex infrastructure projects to ensure high availability and security compliance.

Corsica Technologies | Senior Systems Engineer / Tier 3 Escalation Lead (February 2025 - March 2026)

• Elevated MSP Service Reliability: Resolved complex Tier 2/3 infrastructure escalations across a multi-client Managed Service Provider footprint, significantly optimizing enterprise server uptime, storage performance, and endpoint security.

• Accelerated Hybrid Cloud Migrations: Spearheaded hybrid Active Directory/Entra ID integrations, streamlined Windows Server provisioning, and enforced rigorous firewall security policies adhering to strict compliance benchmarks.

• Optimized Operational Workflow: Authored comprehensive standard operating procedures (SOPs) and mentored support engineering staff, successfully reducing escalation dependency on senior engineering resources by 25%.

• Eliminated Recurring System Failures: Executed rigorous root-cause analysis (RCA) to diagnose and permanently resolve complex hardware, OS, and software failures across mission-critical processing and production environments, effectively eradicating downtime.

• Streamlined Enterprise Deployments: Partnered cross-functionally with software engineers, DBAs, and field operations to accelerate system updates, patch deployments, and hardware performance tuning.

• Ensured 100% Scope Compliance: Validated scope-of-work compliance and rapidly resolved high-priority network and systems hurdles during large-scale enterprise deployments across Fortune 500 corporate and retail sites.

• Executed Zero-Outage Cutovers: Collaborated with project leaders and field technicians to deliver seamless switch, router, and server cutovers without a single minute of site downtime.

• Staged Multi-Site Infrastructure: Configured, imaged, and validated enterprise network switches, firewalls, routers, and virtualized endpoints across distributed multi-site customer environments.

• Mitigated Business Disruption: Orchestrated emergency hardware restorations, thin-client provisioning, and structured cabling diagnostics to safeguard against critical operational outages.

• Managed Distributed Fleet Operations: Delivered rapid onsite diagnostics, OS imaging, server migrations, and hardware rebuilds across widespread enterprise accounts.

• Upheld Strict SLAs: Directed parts logistics and technical deployments to maintain maximum system availability across distributed client footprints.

• Directed Regional Infrastructure: Led regional store technology infrastructure, directing Cisco switch stack configurations, IDF/MDF closet buildouts, and physical connectivity across a 7-year tenure.

• Spearheaded Enterprise Rollouts: Orchestrated hardware deployments for back-office server clusters, POS systems, and telemetry infrastructure while designing and delivering training programs for field technical staff.

• Secured Defense Infrastructure: Delivered high-level system configurations, secure workstation/server deployments, and advanced hardware troubleshooting within a strictly compliant, high-security defense contractor environment.

Associate of Applied Science in Information Technology, Brown College (2002)