Hracho Jan

System Administration

ABB • Full-time

Apr 2023 - May 2025 • 2 yrs 1 mo

# Professional Summary **Experienced System Administrator with 5+ years of hands-on experience** managing Windows and Linux server environments, network infrastructure, virtualization platforms, and enterprise IT systems. Skilled in deploying, configuring, maintaining, and troubleshooting servers, storage, networking equipment, and applications to ensure high availability, security, and performance. Experienced with bare-metal server installation, virtualization, backup and disaster recovery, system monitoring, and infrastructure optimization. Strong background in diagnosing complex technical issues, implementing security best practices, and maintaining detailed technical documentation. I work closely with clients to understand their business needs and deliver reliable, secure, and scalable IT solutions. My approach focuses on minimizing downtime, improving system performance, and providing long-term infrastructure stability. ## Core Expertise * Windows Server Administration * Linux Administration (Ubuntu, Debian, Rocky Linux, AlmaLinux, RHEL) * Bare Metal Server Installation & Configuration * Virtualization (VMware ESXi, Hyper-V) * Network Administration (TCP/IP, DNS, DHCP, VLANs, Routing, Switching) * Network File Services (SMB, NFS, FTP/SFTP) * Email Protocols (SMTP, POP3, IMAP) * VPN Technologies (IPsec, OpenVPN, WireGuard) * System Monitoring & Performance Optimization * Backup & Disaster Recovery * Firewall Configuration & Network Security * Storage Management * MySQL Server Installation & Basic Administration * Documentation & Infrastructure Planning * Hardware Installation, Troubleshooting & Maintenance * Application Installation, Configuration & Support * IT Infrastructure Design & Deployment * Technical Support (L1/L2/L3) * DevOps-Friendly System Administration