Jeffrey Yeung

Junior System Administrator |

Philadelphia, PA

Summary

System Administrator–focused server support specialist with hands-on experience managing Linux and Windows hosting environments in a production ISP setting. Skilled in web, DNS, mail, and SSL infrastructure troubleshooting across virtual and dedicated servers. CompTIA Security+, Network+, and A+ certified with strong foundation in networking and Linux administration.

Experience

System Administrator (Server Support Specialist L1)

2024 – Present

Administer and troubleshoot Linux and Windows virtual/dedicated servers in a large-scale hosting environment.
Diagnose and resolve web, mail, DNS, and network service issues across Linux and Windows servers (HTTP/HTTPS, SMTP, TCP/IP).
Configure and maintain Plesk hosting services including SSL deployment, mail services, and DNS settings.
Investigate service outages, access failures, and configuration errors across customer server environments.
Collaborate with L2 teams by gathering diagnostics, reproducing issues, and supporting escalation handoffs.
Support production hosting infrastructure serving internet-facing applications and services

Infrastructure Projects

Self-hosted Linux server stack with Nginx reverse proxy and Docker services
DNS zone hosting and domain routing lab

Technical Skills

Systems:

Linux (Ubuntu, CentOS), Apache, Nginx, Plesk, MariaDB, PHP

Networking:

DNS, TCP/IP, SMTP, IMAP, SSL/TLS, Firewalls

Infrastructure:

VPS, Shared Hosting, Virtualization, Monitoring

Tools:

Bash, SSH, Git, Log Analysis, Troubleshooting, Jira, Acronis

Education & Certifications

CompTIA A+

2024–2029

CompTIA

CompTIA Network+

2025–2029

CompTIA

CompTIA Security+

2026–2029

CompTIA