Senior System Administrator — Infrastructure, Networking & Server Security
I'm Kalesh R, a Senior System Administrator with 10 years of experience architecting, securing, and maintaining mission-critical IT infrastructure across hosting, enterprise, and client-facing environments.
My work spans Windows/Linux server administration, Active Directory and access management, network design, firewall and DNS management (Cloudflare), and control-panel ecosystems (cPanel/WHM, Plesk, IIS) — with Bash and PowerShell scripting for automation, and hands-on exposure to AWS and Microsoft Azure.
I've built a track record of maximizing uptime, hardening security posture, and resolving complex incidents under pressure — from firewall configuration to full-scale VPS remediation.
The core systems and tools I work in day to day.
Windows & Linux server management, cPanel/WHM, Plesk, and IIS — provisioning, maintenance, and migrations.
LAN/WAN topology, SD-WAN routing, load balancing, and firewall policy with Sophos & Netfox.
Cloudflare DNS management, Google Workspace, plus AWS and Microsoft Azure cloud administration.
Imunify360, antivirus consoles, RAID/CCTV hardening, and full-scale VPS compromise remediation.
Active Directory administration, user provisioning, and access control across organizations.
Bash and PowerShell scripting to automate routine administration and monitoring tasks.
Ongoing administration, monitoring, and maintenance of Linux servers and hosting environments.
Locking down servers, and cleaning up after compromises — backdoors, tampered configs, malicious payloads.
Server-to-server and cPanel-to-Plesk (or reverse) migrations, handled end to end.
Based in Kottayam, Kerala, India — working with clients globally. Reach out for system administration or infrastructure work.