Senior Linux System Administrator & Tech Team Lead at PharmaCores (2025-06 – Present)
- Led all IT infrastructure for the startup on pure RHEL servers, architecting and managing the complete Linux environment while mentoring and educating 3 technical team members on Linux administration and WordPress best practices.
- Designed, built, and optimized a high-performance WordPress platform on a custom RHEL + LEMP stack (NGINX, MariaDB, PHP-FPM) to power the company's main website and full educational portal.
- Implemented multi-layered caching solutions (NGINX caching, PHP OPcache, Valkey object caching, and FlyingPress), resulting in over 60% improvement in website loading speed and better user experience.
- Implemented comprehensive backup strategies using rsnapshot and REAR with regular backup validation and restoration testing.
- Built and administered a dedicated production mail server using iRedMail on a separate RHEL server, ensuring reliable corporate email delivery for the entire organization.
- Performed continuous performance tuning and custom development (PHP, HTML, CSS, JavaScript), successfully delivering a fully functional educational website featuring WooCommerce and Tutor LMS.
Linux Content Author at TutorialsPoint (2025-01 – 2025-04)
- Authored more than 30 in-depth technical articles covering Linux system administration, command-line tools, performance monitoring, security, scripting, and server management.
- Produced high-quality learning materials that attracted hundreds of readers worldwide.
- Check all my published articles here: https://www.tutorialspoint.com/authors/ahmed-abdul-monem.
Linux/Infrastructure Engineer at DiverseLTD (2023-10 – 2024-11)
- Performed deep-dive troubleshooting and root cause analysis on complex Linux system issues.
- Designed, deployed, and administered VMware vSphere 8 virtualization infrastructure.
- Resolved high-impact customer issues, minimizing downtime and ensuring service stability.
- Collaborated with development and operations teams to optimize infrastructure performance and reliability.
Linux System Administrator at HorizonTechs (2020-07 – 2023-09)
- Managed Linux infrastructure for 30+ production servers supporting web hosting services across RHEL and Debian distributions.
- Expertly managed cPanel/WHM hosting environments along with custombuilt LAMP/LEMP stacks for production web applications.
- Designed and optimized storage solutions (LVM, RAID, NFS, SMB, iSCSI) to ensure highperformance web hosting environments.
- Implemented MariaDB database replication and highavailability strategies to maintain uptime for hosted websites and client applications.
- Built and maintained Proxmoxbased virtualization infrastructure to provision and manage client web hosting servers and VPS.
- Delivered technical support to 15+ customers, performed security hardening, and mentored juniors while resolving complex web hosting issues.
