Zaenal Akhmad Rifai
Senior IT Engineer with 10+ years building and operating large-scale infrastructure at Smartfren and Detik.com — from Hadoop clusters and Kubernetes to CI/CD pipelines and data centre operations. Founder of Doctor Web, delivering cloud infrastructure and a commercial POS product. AWS, Azure, ArangoDB, Ubiquiti, and TP-Link certified.
Founded Doctor Web, an IT solutions company in Karawang offering cloud infrastructure, server setup, cybersecurity, and digital product development. Built and launched Laris, a browser-based POS system for Indonesian SMEs with offline-first sync, multi-outlet management, QRIS payments, thermal printer integration, and enterprise-grade security. Delivered freelance server setup for TGShop, SuperFrezz, Mallgue, and Super Project. Earned 5 IT certifications.
Managed Proxmox virtualization platform hosting 40 VMs; administered Zimbra mail server for 1 enterprise client (200 users). Maintained infrastructure visibility with Zabbix and Observium. Administered Apache, Nginx, MySQL, and PostgreSQL servers. Operated data centre facilities and configured OPNSense proxy/firewall.
Deployed and maintained a 230-node Hadoop cluster via Ambari; set up MySQL, PostgreSQL, and NFS storage. Built ELK Stack monitoring platform for 240 VMs. Implemented fully automated CI/CD with Jenkins and Ansible for 2 teams across 5 pipelines. Conducted penetration testing with ZAP Proxy and load testing with Locust.
Installed end-to-end Hadoop ecosystem using Ambari. Managed HDFS data operations including backup/restore and ACL governance. Automated operational tasks with Jenkins; monitored with ELK Stack. Authored customer-facing installation documentation.
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 for high-availability NameNode and ResourceManager failover. Monitored with Nagios, performed data centre hardware maintenance.
Provisioned and configured OpenStack cloud instances and cPanel environments. Diagnosed and resolved technical support issues; managed email deliverability and anti-spam systems.
Configured network infrastructure, delivered end-user training, produced technical documentation. Performed QA testing and bug reporting; produced user manuals.