irfanayub

Lead / Enterprise Systems Administrator

Pakistan International Airlines • Full-time

Dec 2001 - Present • 24 yrs 5 mos

Over the past 24 years, I have established a distinguished career in the Information Technology sector, specializing in enterprise-grade infrastructure management, secure systems administration, and robust backend automation. My expertise spans across designing, deploying, and optimizing high-availability communication frameworks, enterprise email ecosystems, and secure mail gateways for large-scale organizations. Key Areas of Expertise: - Enterprise Infrastructure: Advanced administration of Linux and Windows environments, clustering, high availability, and storage area networks (SAN). - Email Infrastructure & Security: Expert-level management of Zimbra collaboration suites, Proxmox Mail Gateways, and Barracuda security appliances. - Cloud Migrations: Seamless execution of large-scale, multi-tier tenant migrations from legacy on-premises servers to Microsoft 365 and Google Workspace. - Full-Stack & AI Automation: Development of specialized enterprise tools and automated monitoring agents using React, FastAPI, TypeScript, and local LLM frameworks like Ollama. Professional Achievements: - Successfully architected and executed the migration of 4,000+ corporate email accounts to Microsoft 365, ensuring zero data loss and absolute zero operational downtime. - Implemented robust security policies using Proxmox Mail Gateway, effectively mitigating inbound spam, phishing, and malware attempts by over 95%. - Led major data center infrastructure refreshes involving hardware procurement, capacity planning, and deployment of enterprise-grade server clusters. - Developed custom internal monitoring portals using Python (FastAPI) and modern JS frameworks, drastically reducing system diagnostic times. - Actively maintained compliance standards for strict international technical audits, ensuring network security and continuous operational readiness.