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Flag of United States Thanh Hoa, United States
Member since December, 2009
1 Recommendations


I am very experienced with: * Magento/WordPress/HTML * Linux maintaince/troubleshooting (RHEL, Centos, Debian, Ubuntu, FreeBSD, gentoo, Mac OS X Server), * Virtualization: (Vmware Esxi 5.x, Openvz, Virtuozzo, Xen, KVM, vserver), * Cloud hosting (Amazon EC2, AWS, S3, RDS, simple Cache), * Networking (dhcp, DNS:powerdns/bind/named, vpn: openvpn/pptp, firewalls: iptables/ipfw, qos, proxies, tcpdump), * Web servers (apache, nginx, lighttpd, tomcat, ssl installation and troubleshooting), * Caching ( apc/xcache/memcached/varnish/nginx) * Mail servers (exim, postfix, qmail, antispam/ antivirus: clamav/spamassassin/amavis, courier, dovecot), * Bulk marketing (Dkim, spf, high speed/inboxing, interspire), * Automation (puppet, perl/shell/awk scripting), * Monitoring (nagios, zabbix, munin), * Hosting Ccontrol Panels (Cpanel/WHM, Plesk, Directadmin, ISPconfig..). * Mobile Application (Android / iOS / Windows Phone)* Magento/WordPress/PHP
$20 USD/hr
155 Reviews
  • 69%Jobs Completed
  • 100%On Budget
  • 99%On Time
  • 12%Repeat Hire Rate

Recent Reviews


Security Researcher

Jul 2011 - Oct 2011 (3 months)

I worked as Security Researcher at Google, inc for 3 month, then I decided to leave job and worked as freelancer.


Computer Science

2002 - 2006 (4 years)


Cisco Certified Network Associate (2006)


I completed the CCNA course.

Red Hat Certified System Administrator (RHCSA) (2006)


I completed this Red Hat Certified System Administrator (RHCSA) in 2006

Red Hat Linux Troubleshooting (RH242) (2005)


I completed the Red Hat Linux Troubleshooting (RH242) in 2007 and got updated since then.

MCSE (2007)


Microsoft Certified Systems Engineer

Magento Certificate (2012)


got Magento Certificate in 2012


How to attack and fix Local File Disclosure

That book is about how to find and fix Local File Disclosure. I also published a lot of vulnerabilities for many famous company like Google, vBulletinĀ®, World Bank, Miss World, Twitter...