Kalesh R

Senior System Administrator with 10 years of experience architecting, securing, and maintaining mission-critical IT infrastructure for hosting, enterprise, and client-facing environments. Deep expertise across Windows/Linux server administration, Active Directory and user access management, network design, firewall and DNS management (Cloudflare), and control-panel ecosystems (cPanel/WHM, Plesk, IIS), extending to building-wide low-voltage and communications systems (EPABX/IP PBX, PA, CCTV, biometric access, structured cabling). Proven record of maximizing uptime, hardening security posture, and resolving complex incidents under pressure, from firewall configuration to full-scale VPS remediation, with continuous focus on automation and emerging-AI tooling that keep infrastructure operations modern and efficient.

Senior System Administrator at Joyra Systems Pvt Ltd (2019-05 – 2025-09)

Administered enterprise hosting infrastructure end-to-end, including billing, NAS, and web servers, maintaining consistent uptime across client environments.

• Configured and hardened RAID arrays and CCTV surveillance systems to safeguard physical and data infrastructure.
• Delivered full-stack hosting support across Plesk, cPanel, and IIS, managing provisioning, migrations, and troubleshooting for multiple client accounts.
• Diagnosed and resolved complex hardware, software, and network issues, minimizing downtime and escalation volume.
• Designed and maintained LAN/WAN topology and firewall policy (Sophos, Netfox) to secure perimeter and internal traffic.
• Owned Google Workspace administration and DNS/SSL/email configuration, ensuring secure and reliable business communications.
• Deployed and managed building-wide communication and surveillance systems, including EPABX/IP PBX, PA systems, biometric attendance, IPTV, and structured cabling.

System Administrator at Vinnbpo India Pvt Ltd (2015-01 – 2018-12)

Deployed and maintained core infrastructure systems, including a production Vici Dial server on Ubuntu.

• Monitored network performance and administered user access controls across the organization.
• Established routine backup and disaster-recovery procedures to protect business-critical data.
• Provided frontline hardware/software troubleshooting and end-user technical support.

Bachelor of Science in Computer Science – Rathinam College of Arts and Science (2014-06 – 2016-04)