Dec 2021 – Aug 2023 · 1 yr 8 mos · Delhi, India · Hybrid

• At TCS, I was responsible for the administration, performance tuning, and modernization of Red Hat-based infrastructure across critical business environments. My role emphasized system stability, legacy OS migrations, performance optimization, and proactive incident resolution in a high-availability 24/7 production setup.
• ✅ Key Achievements & Responsibilities:
• 🔄 Legacy to RHEL 8 Migration: Led OS upgrade projects for 150+ servers (RHEL 6/7 to 8) on both VMware and RHV, improving system stability and eliminating end-of-life risks.
• 🛡️ Patch Automation & Compliance: Developed patch validation scripts using Bash and automated YUM/RPM installs, reducing patch deployment time by 60% and achieving 99.8% compliance in vulnerability scans.
• 🧱 LVM & Filesystem Management: Designed and implemented dynamic LVM grow/shrink procedures; performed ACL audits, filesystem cleanups, and XFS/ext4 resizing across hundreds of nodes.
• 🔁 Disaster Recovery & Hardening: Played a key role in DR drills by scripting IP failovers, configuring Kdump, and validating backup recovery paths — contributing to a zero-error audit clearance.
• 📊 Monitoring & Incident Handling: Customized Nagios plugins to reduce false alerts by 60%; managed P1/P2 tickets and CRs using HP Service Manager in alignment with ITIL practices.
• 👤 User & Access Management: Administered user provisioning, sudo privileges, SSH key control, and password policy enforcement in secure, multi-client Linux environments.
• ☁️ Virtualization & Cluster Operations: Managed VMware, OVM, and RHV platforms; handled VM snapshots, cloning, cluster node maintenance, and server decommissioning.
• 📦 Package Deployment & Scripting: Installed and configured packages like MySQL, Mailx, PCS, Postfix, and Tomcat; automated routine admin tasks using Shell scripting.
• 🧰 Technologies & Tools:
• RHEL 6/7/8 • VMware ESXi • RHV Manager • LVM • XFS/ext4 • Nagios • YUM/RPM • Bash Scripting • DNS • SAN/NAS • HP Service Manager • Kdump • PLA

Aug 2018 – Dec 2021 · 3 yrs 4 mos · Noida, Uttar Pradesh · On-site

• As an L1 Linux Administrator at UST Global, I provided frontline support for Red Hat and UNIX-based server environments. My responsibilities focused on day-to-day server health checks, user management, filesystem operations, and basic issue resolution to ensure reliable infrastructure performance in a 24/7 support model.
• ✅ Key Responsibilities:
• 🧑‍💻 User Management & Access Control: Created, modified, and removed user accounts; reset passwords, assigned sudo permissions, and managed group-level access.
• 🔍 System Monitoring & Health Checks: Performed routine health checks using Nagios for CPU, memory, disk, and swap utilization; responded to alerts and escalated critical issues.
• 💽 Filesystem & Storage Tasks: Configured and maintained LVM partitions, mounted filesystems, and handled NFS and FTP setups for data transfer and storage access.
• ⚙️ Package Installation & Configuration: Installed required packages and tools using YUM and RPM; ensured correct configuration of SWAP, DNS, and network settings.
• 📈 Performance Support: Assisted in monitoring and reporting system resource usage; supported performance tuning tasks under senior admin guidance.
• 🧾 Incident & Ticket Management: Logged, updated, and followed up on issues using ITSM tools; documented changes and raised change requests where necessary.
• 🔁 Routine Admin Activities: Handled job terminations, monitored backup jobs, cleaned temporary/log files, and used tools like WinSCP for secure file transfers.
• 🕒 24/7 Support Rotation: Provided consistent support during shifts to meet SLAs and minimize downtime for production systems.
• 🧰 Tools & Technologies:
• RHEL 6/7 • Nagios • LVM • NFS/FTP • DNS • YUM/RPM • WinSCP • ITSM Ticketing Tools • Bash (basic) • SWAP & Disk Management

Jan 2017 – Aug 2018 · 1 yr 7 mos · Delhi, India · On-site

• Started my professional journey as a Support Engineer, gaining foundational experience in Linux-based system administration, infrastructure monitoring, and basic server maintenance. This role laid the groundwork for my career in enterprise IT support and operations.
• ✅ Key Responsibilities:
• 🛠️ Linux Server Setup & Monitoring: Assisted in the installation, initial configuration, and day-to-day monitoring of Linux servers (primarily Red Hat and CentOS); ensured uptime using Nagios monitoring tool.
• 👨‍💻 User Administration: Created and managed user accounts, permissions, and access controls; enforced password policies and supported basic ACL configurations.
• 📊 Server Health Checks & Troubleshooting: Performed regular server health validations (CPU, memory, disk usage); supported L1 troubleshooting and escalated critical alerts to seniors.
• 🧾 Reporting & Documentation: Maintained weekly and monthly reports on system status, server inventory, ticket updates, and monitoring logs.
• ⚙️ System Support & Coordination: Supported software installation, minor configuration changes, and OS patch validation; coordinated with vendors for escalated issues when required.
• 🌐 File Transfer & Remote Access: Used tools like WinSCP and SSH to manage remote connections and handle file transfers securely.
• 🕒 Shift-Based Support: Delivered consistent 24/7 Linux support as part of a rotational support team for business-critical operations.
• 🧰 Tools & Technologies:
• Red Hat Linux • CentOS • Nagios • SSH • WinSCP • User & ACL Management • Basic File System Management • ITIL-based Reporting • OS Patch Validation