Dan Tran

About Dan Tran

I’m a Security Analyst with a background in infrastructure and system administration, now…

Experience

1. System Administrator

   Sun Holdings

   Nov 2023 — Present · Dallas, TX, US

   Contributed to the recovery of corporate and restaurant networks following a ransomware incident by re-imaging systems and restoring secure configurations, working cross-functionally to minimize downtime- Helped architect and maintain a hybrid network infrastructure using Cisco Meraki and FortiGate, enhancing security, visibility, and performance across distributed environments- Transitioned firewall management from third-party vendors to in-house operations, improving control and responsiveness while supporting secure access at scale- Designed and implemented network automation solutions using Python and REST APIs to manage Cisco Meraki infrastructure, demonstrating expertise in scripting, API integration, and remote device operations across diverse network environments- Supported a collaborative Google Workspace to Microsoft 365 migration, helping implement improved communication, access control, and data protection measures- Assisted in migrating ticketing, backup, and firewall systems into internal control, strengthening performance and ensuring policy alignment with operational standards.Implemented layered security improvements including endpoint protection, MFA, advanced threat detection, and automated backup strategies to reduce exposure and support continuity- Helped secure virtual infrastructure across VMware and Hyper-V environments through access policy enforcement, system patching, and high-availability configurations- Participated in the organization-wide softphone and VoIP migration using 3CX, assisting with user provisioning, call routing, and training to ensure adoption and reliability- Provided administration and performance tuning for Windows and Linux systems, enforced group policies, and contributed to Active Directory management and security controls- Automated routine administrative tasks using PowerShell and Bash scripting, improving consistency, compliance, and IT team efficiency across a large device fleet.