Zaenal Akhmad Rifai

•Founded Doctor Web, an IT solutions company in Karawang offering cloud infrastructure, server setup, cybersecurity, and digital product development to local businesses •Built and launched Laris — a full-featured browser-based POS system for Indonesian SMEs, developed with React/Vite, featuring offline-first sync, multi-outlet management, QRIS payments, thermal printer integration, and enterprise-grade security (JWT, WAF, rate limiting). Live at doctor.web.id/product •Delivered freelance server setup and configuration for commercial projects including TGShop, SuperFrezz, Mallgue, and Super Project •Earned 5 IT certifications (TP-Link OCNA, OCNA R&S, VIGI, UniFi UFSP, D-Link DCNA) and currently pursuing AWS, Azure, and Google Cloud certifications

•Managed Proxmox virtualisation platform hosting 40 VMs across client environments; administered Zimbra mail server for 1 enterprise client (200 users) •Maintained infrastructure visibility and uptime through proactive monitoring with Zabbix and Observium •Administered Apache, Nginx, MySQL, and PostgreSQL servers across multiple client environments •Operated data centre facilities and configured OPNSense proxy/firewall for perimeter security

•Deployed and maintained a 230-node Hadoop cluster via Ambari across production environments; set up MySQL, PostgreSQL, and NFS storage solutions •Built ELK Stack observability platform monitoring 240 VMs across the infrastructure fleet, enabling proactive incident detection •Implemented fully automated CI/CD with Jenkins and Ansible — every approved push request triggered automatic deployment to target environments, eliminating manual uploads for 2 development teams across 5 pipelines •Conducted penetration testing with ZAP Proxy and application load testing with Locust to ensure system security and resilience

•Installed end-to-end Hadoop ecosystem using Ambari, enabling repeatable and automated cluster deployments •Managed HDFS data operations including backup/restore and ACL-based access governance •Automated operational tasks with Jenkins; monitored resources with ELK Stack •Authored customer-facing installation documentation adopted as the official deployment reference

•Deployed Hadoop cluster using Ambari and managed HDFS data lifecycle (backup/restore, ACLs) in a short-term project engagement

•Installed and managed a 26-node Hadoop cluster (18 production, 4 staging, 4 dev) alongside MySQL/PostgreSQL databases and Apache Flume pipelines across 30 data centre servers •Implemented LVS (Linux Virtual Server) for high-availability NameNode and ResourceManager failover, ensuring cluster resilience •Monitored infrastructure with Nagios and performed data centre hardware maintenance and machine replacements

•Provisioned and configured OpenStack cloud instances and cPanel environments, enabling enterprise customers to go live on the cloud platform •Diagnosed and resolved technical support issues for cloud service customers; managed email deliverability and anti- spam systems to maintain service reliability

•Configured network infrastructure, delivered end-user training, and produced technical documentation •Performed QA testing and bug reporting; produced user manuals for software products