Sai Sagar

I’m an Infrastructure Engineer focused on designing, securing, and operating hybrid IT environments across cloud and on-prem ecosystems. I bring deep expertise in endpoint lifecycle management, corporate networking, and infrastructure security grounded in Zero Trust principles.

In my current role with Ernst & Young (EY), I manage and secure hybrid infrastructure supporting 500+ servers across multiple sites, including Windows, Linux, VDI, and NAS. I administer VMware ESXi and Proxmox clusters (HA, resource optimization, and lifecycle management) while leading patch management and incident response with root-cause analysis across infrastructure and network domains.

I build observability and reliability into every layer—using Zabbix and Wazuh to enable proactive issue detection, and operating large-scale backup infrastructure (6.2+ PB) with a 3-2-1 strategy, including tape and cloud integration. I also deploy and manage Kubernetes clusters for internal applications and services, ensuring stable, isolated environments from sandbox to production.

I’ve also strengthened secure workplace technology through Azure-based infrastructure (with Kubernetes and WAF), Zero Trust-aligned segmentation, and remote access implementations using VPN (IPSec/SSL VPN) and ZTNA concepts. Across my experience, I’ve led network infrastructure design with FortiGate firewalls, segmentation and access controls, and workstation onboarding/offboarding—always with a security-first mindset.