Imagem de perfil de donhuan
Membro desde 21 de fevereiro de 2011
1 Recomendações


On-line Offline
Information Security, Ethical Hacker, Penetration Testing, Network Security, Computer Security, Network Design, Network Administration, Software Development, Web Development.
$9 USD/hr
24 comentários
  • 79%Trabalhos concluídos
  • 71%No Orçamento
  • 71%Pontualidade
  • 22%Taxa de Recontratação


Comentários recentes

  • imagem de Jason S. Integrate 3CX with Zoho Desk $225.00 USD

    “He is very knowledgeable in many different technologies. I work with him on a variety of projects. Highly recommended!”

  • imagem de Jason S. Build SOAP To Connect PHP/MySQL to QB Web Connector $2105.42 USD

    “He is a talented and dedicated developer. Highly recommended! [06 March, 2019] Very talented freelancer, highly recommended”

  • imagem de Jason S. Raspberry Pi External USB Modem Configuration $1736.54 USD

    “He knows what he is doing. Solved many issues for us on this project. Will use again for phase 2 of project.”

  • imagem de Shneur G. Increase DataStore on VMware box Hard Drive already isntalled $175.00 USD

    “If you read this review. Do not let Do's quiet way of chatting fool you. I have been in network for 20 years. I have hired many Engineers. I am an Engineer myself . We are extending our team and took a chance with Do. The project was harder than we both thought. I even loss faith and brought many other people to look at it. None of them! Could figure it out or do the job. Do was confident and knows what he knows. He is also personable and what we wanted most of all communication. Any good review would not give Do justice. He also helped us out with a very good client. --- I will be hiring him as much as I can .”

  • imagem de Randy T. Project for Do N. $110.00 USD

    “Let him work on my computer when I was away so that the next day it was all fixed up .”

  • imagem de M A. network Expert $30.00 USD

    “good , fast , smart .”


System penetration testing

Dec 2016

I have a big responsibility in protecting the information system (computer network, Voice IP network, data). I'm a leader of a security group who have to implement solutions to protect our IT system, such as: update devices, implement security configuration, do penetration testing all IT devices in our IT system.

Application Security

May 2014 - Dec 2016 (2 years)

In this period of time, I do application penetration. The purpose of my work is to find security vulnerabilities in applications (desktop applications and web applications) and fix them.

Network Security

Sep 2012 - Apr 2014 (1 year)

I worked as a security expert who implemented solutions to protect the computer network of my organization (install Firwall, IPS, IDS, Antivirus, Security Policies, NAC System, CA System). I also do task of a network administrator.

Network Administration

Oct 2011 - Aug 2012 (10 months)

In this period of time, I worked as a network administrator. In more detail, I install Servers (AD, DC, Database Server, Web Server, File Server, Proxy Server, Mail Server), config network devices (Cisco Router, Cisco Switch, Load Balancing devices, Wifi Access Point) and monitor the status of all devices in our network.

Web Development

Jul 2010 - Aug 2012 (2 years)

In these years, I created many websites. The languages that I used were [login to view URL], PHP, HMTL, Javascript, CSS. Those website are based on wordpress, Yii.


May 2010 - Oct 2011 (1 year)

Solve Complex problems in Algorithm.

Software Development

Jun 2008 - Jul 2010 (2 years)

In this year, I worked as a coder. I wrote a lot of software and tools in .NET (C#, VB NET), C, C++.



2005 - 2010 (5 years)


First_Prize (2008)

Vietnam Association for Math Processing & Ministry of Education and Training


Second_Prize (2009)

Vietnam Association for Information Processing & Ministry of Education and Training

c++, Algorithm

Second_Prize (2010)

Vietnam Association for Information Processing & Ministry of Education and Training

c++, Algorithm.

CCNA (Cisco Certified Network Associate) (2013)


CCNA (Cisco Certified Network Associate) is an information technology (IT) certification from Cisco. CCNA certification is an associate-level Cisco Career certification. ... Passing the ICND1 grants one the Cisco Certified Entry Networking Technician (CCENT) certification.

Cisco Certified Network Professional (CCNP) (2014)


Cisco Certified Network Professional (CCNP) is an intermediate-level certification in the Cisco certified professional program. This certification is aimed at full-time network or system administrators, or those who work with local and/or wide-area network (LAN/WAN)infrastructure.

Certified Ethical Hacker (CEH) (2015)


Certified Ethical Hacker (CEH) is a qualification obtained by assessing the security of computer systems, using penetration testing techniques.

ACM ICPC (International Collegiate Programming Contest) (2010)

ACM (Association for Computing Machinery)

The ACM ICPC (International Collegiate Programming Contest) is a sport programming world championship held annually


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