Deployed a comprehensive monitoring platform for on-premise and cloud systems across 35+ national locations. Managed ~1,000 hosts using SNMP, Zabbix agents, and JMX, leveraging Discovery Rules to automate host creation and manage auto-scaling instances.
Implemented a centralized, immutable logging system for ISO 27001 audit compliance. Architected a 4-node ELK cluster ingesting logs from Windows workstations, Linux servers, and FortiGate firewalls, utilizing Logstash for processing and Kibana for analysis.
As Senior Systems Administrator, streamlined software releases and Linux server configurations to enforce standardization. Leveraged Ansible (YAML roles and playbooks) to centrally manage security updates and application deployments for critical production webmail, chat, and DNS platforms, cutting deployment times by 50%.
Orchestrated a critical migration from standard ESXi to a multi-node Proxmox cluster environment. Enhanced cost-efficiency by utilizing heterogeneous hardware, enabling efficient VM/container management, network separation, live migrations during maintenance, and enhanced data security via Proxmox Backup Server.
As a volunteer for a non-profit foundation, built a restricted-budget IT platform from scratch. Leveraged DigitalOcean (IaaS, networking, and firewalling) to deploy Ubuntu instances. Managed Python dev environments via Git and GitLab, and implemented automated certificate management using Certbot/Let's Encrypt and service monitoring via Monit.
As Junior Systems Administrator, implemented a customized deployment of 150+ Slackware Linux workstations, migrating users from Windows. Enhanced security and stability, managing specialized application software packages (Firefox, Thunderbird, OpenOffice) and ensuring compatibility with necessary legacy tools via CrossOver/Wine.