Profile image of cjconstante
Flag of Colombia MonterĂ­a, Colombia
Member since July 20, 2017
3 Recommendations


Online Offline
I am Cristian, an ethical hacker (security professional). I can provide defensive methods to your systems / networks to secure them in the best way or, offensive methods (attacking) your systems / networks, as a real hacker would, but in a professional and controlled manner. I will strive from the technological side to grow your business and reputation so that you can render good services to your customers. I am also a network and telecommunications specialist and have more than 5 years of experience in administration, configuration and server hardening. It is one of the tasks that I like to do most. Tools/Skills. - Operating Systems: Linux (CentOS, Fedora, RedHat, Ubuntu, Debian) and Windows Servers (2008R2 - 2012 - 2016) - Firewalls/Proxy: pfSense, IPTables, CSF, Cisco, Juniper, Check Point, Zentyal, ClearOS - VPN: OpenVPN, StrongSwan, OpenSwan, IPSec, SoftEther VPN, PriTunl
$50 USD/hr
62 reviews
  • 90%Jobs Completed
  • 92%On Budget
  • 94%On Time
  • 8%Repeat Hire Rate


Recent Reviews

  • image of Nicholas D. Create a VPN on Linux and allow for custom block rules [Sealed]

    “Cristian delivered exactly what we needed. We will definitely work with Cristian again!”

  • image of Jorge C. Cloud Project $500.00 USD

    “Made me lost 2 weeks of my project. Never was on time for the meetings and talked over and over about the same without any progress on the project. It was really a waste of time. It was necessary to get a different person, that did the same in 2 days.”

  • image of Samir P. Web App Tester $440.00 USD

    “Cristian, knew his stuff and was on point with every detail of the project. I can recommend him for your work.”

  • image of Dan F. Experienced server administrator $1037.00 USD

    “Good server guy on hand when you have some urgent”

  • image of Moses K. Urgent : Connect to a remote Cisco VPN from Strongswan hosted on Google Cloud $150.00 USD

    “Cristian C knows this topic (Strongswan on Linux) inside out. He is also very good in Linux administration and networking on Linux. He was very helpful in troubleshooting, even directing the other side of the tunnel how they should configure their server. He is honest in his opinion and also was patient with a condescending client. I thank him. I am so grateful and I would recommend him for any future jobs.”

  • image of Richard H. Demo ISP Mail Server Configuration for School LAB $550.00 USD

    “Failed to complete project. Failed to comunicate.”


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