- Manage the entire IT infrastructure including Data Center in Hai Phong and 5 branches: Hanoi, Hoi An, Nha Trang, Phu Quoc, Australia.- Manage Datacenter with JUNIPER firewalls, CISCO switches, HP servers, UNIFY PBX, Wireless controller and Access point ARUBA, APC UPS- Manage Vmware servers, Windows servers, SQL servers, Active Directory, Email Exchange server, Office 365, Sharepoint, File servers, Printer servers, Web server, DHCP Server, PRTG server, timekeeper servers, GolfSoft operation servers- Working as a Project Managemen: planning, following, and allocating resources to deploy according to timelines. Some projects: Increase customer experience - SmartScore, Booking online system, GolfSoft operating software, and other digital transformation projects...- Make IT budget (Opex, Capex) for the entire company. Make a plan, and implement items according to the approved IT budget plan.- Make an annual IT action plan, control, and monitor the implementation of the company's action plan.- Working with other companies in the Vin group on Security (VinCSS), system integration (VinITIS), and data management systems (HMS, ERP, SAP).- Review and fix security risks and vulnerabilities in the company's IT systems.- Monitor and track system activities, and control compliance with the operation of the company's IT system.- Support to operate the IT system and handle user requests.

- Built a strong IT infra with big Datacenters (05 On-Premises and 02 Clouds AWS/Viettel-ICD) for inter-networking 100+ Offices in Indochina regional to improve communication in saving cost manner.- Built Contact Center to support multi-channels (email, SMS, tel, social networks,…): CRM + Call center- Established & direct managed a team of 20 subordinates covering key tasks and applied success ITIL framework for 2000+ business users.- IT Governance & compliance: Discussed/reviewed/Applied 15 policies regarding IT operation/governance/compliance such as SLA/OLA, Helpdesk process, Computer HW-SW standard policy, Information Security Policy, Enterprise IT Naming convention, Web content management, Internet/Email policy, DRP/BCP, Backup & Restore Procedure, IT Asset management policy.- Archived & well-managed the Infrastructure indicated by 99,96 uptimes for headquarters and 96% update average for over 100 branch offices.- Manage, review, make the planning for IT budget yearly about Licenses(MS Windows, MS Office, MS SQL, MS Exchange, ESET antivirus, Veam backup, Fortinet security bundle, Zoom Meeting, ...), SSL Certificate, Domain renewal, Upgrade hardware ( Server, Network devices, PC, laptop, NAS, CCTV...), Leasing cost(Connectivities, MFP Leasing, Voices, Rack, Maintenance contract), Cloud service( Office 365, AWS S3, Viettel Cloud Servers)

- Setup, configure, manage & make diagnostic errors for IBM, HP server; Cisco, HP, Linksys, Draytek network devices; Altai, Aruba, FortiAP, UniFi, Linksys wifi solution system; Cisco ASA, FortiGate firewall devices; FortiAnalyzer center logs; FortiMail Antispam gateway; QNAP, Synology NAS devices; Honeywell, HIK CCTV system.- Install, configure and manage the systems using virtualization technologies: Hyper-V; VMware ESX/ESXi...- Design and implement about Network(LAN, WAN, Wireless, Routing, Policy route, VPN,..) and Security( DDOS, IPS, Application control, Policy access, Filter virus, Antispam,…)- Install, configure and manage servers such as AD, DHCP, DNS, File server, Email Exchange, Website, WSUS, HA proxy, Bacula backup, Veam backup,..- Moving Email Exchange system from on-premise to Office 365 successful.- Configure and manage Asterisk VoIP PBX with SIP Trunk, E1, SIM gateway, connect to CRM become Contact Center.- Configure and manage Polycom Group 500 Video conference devices. Video conference online systems such as Webex, Zoom. Build, configure, and manage BigBlueButton Video conference system open-source.- Manage assets and documents of IT by OCS, GLPI open-source system.- Store and manage online documents by Alfresco open-source system.- Manage and support users through the OS ticket system- Build a monitor system to monitor all IT devices, send alerts as email, telegram messages on Zabbix software open-source- Collaborate with Dev department to prepare many infrastructures for many software projects such as eFMS( Forwarder Logistics ), eWMS( Warehouse ), eTMS(Trucking), ECOS( Express ), MyMall, MyFace e-commerce platform.- Built 3 Datacenters at HCM, HN, DN for VFS Global and supported the operation of the system according to ISO 27001 standard.- Make suggestions and recommendations to the CIO about upgrading the infrastructure and securing existing systems

- Manage all LAN/WAN networks at the company's headquarters and all branches.- Configure, monitor, and optimize network devices such as routers, layer 2 switches, Cisco core switches, ASA 5520 firewall security devices.- Configure, install, monitor File server, DNS, DHCP server on windows server 2K8- Manage, install and upgrade for SAP server, Ivend server, SES server systems.- Manage MetroNet lines connect branches to head office, leaseline internet lines, FTTH. Make sure the connections are always smooth and stable.- Monitor and analyze network traffic and improve network security policies. Decentralize users to use internet resources.- Set up SSL VPN, IPSEC VPN, Any connect VPN connections on the ASA according to company needs.- Install and monitor anti-virus, spam, and spyware programs for all servers & workstations.- Manage the PBX with billing software, CCTV, timekeepers and timekeeping software at the head office and all branches.- Write documents and make backup plans for all systems, networks. Ensure stable system operation, shortest downtime.- Support users with any issues related to IT.

- Manage the entire server system of the company, the system of IBM servers, routers, switches of Cisco.- Manage 2 domain controllers based on Windows 2003. ISA firewall system, data backup storage device.- Manage internet connections, N-computer systems, wireless project systems.- Install and manage NEC PBX, Panasonic PBX- Manage Zimbra email server, Ebox firewall based on virtualization technology ESXi server- Manage and troubleshoot computer, printer, server, PBX, other problems in the company- Support users with any issues related to IT.

- Manage and operate the entire Nortel Contact Center 6 system including Nortel's CS1000E PBX system and IBM x3650 servers, Nortel's system of power and layer 3 switches, softphones, IP Nortel phone, 3000KVA UPS system- Manage transmission lines such as lease line, FTTH of Viettel; MegaWan, ADSL of VNPT; Fiber optic line connects directly to Vinaphone Mobile Center.- Administer, install, and handle problems related to computers, laptops, servers, projectors, software, and network systems.- Install, and manage Email server, Webserver, FTP server.- Participating in the deployment of the Contact Center systems for customer companies.