Profile image of repairman4
Flag of United States Rockford, United States
Member since September, 2010
3 Recommendations


Primarily skills in performance programming, C++/C, Objective C, Fortran, Parallel Programming, pthreads, GUI development, Cocoa, JNI, and Network programming (TCP/IP, Encryption).Specialize in client/server applications over TCP/UDP sockets, UDP hole punching. Over 25 year experience in these: OS X, UNIX, Linux, Windows, Solaris. Also, specializing in License Management
$50 USD/hr
26 Reviews
  • 70%Jobs Completed
  • 100%On Budget
  • 97%On Time
  • 3%Repeat Hire Rate

Recent Reviews

  • image of pallaalekhya93 clent server communication using objectives $55.00 USD

    “Well and good.”

    pallaalekhya93 Flag of United States 2 months ago.
    • Linux
  • image of dmlangdonjr Client and Server Network Programming $88.00 USD

    “Excellent work. Everything was delivered on time and exactly how I asked.”

    dmlangdonjr Flag of United States 4 months ago.
    • C Programming
  • image of androidfan1 Port some Linux Code to WIndows $250.00 USD

    “Brillant, Completed in timely fashion and made sure everything was working as it should.”

    androidfan1 Flag of New Zealand 8 months ago.
    • .NET
    • Linux
    • Software Architecture
    • C++ Programming
  • image of fertuser2 modify linux command script.c $277.00 USD

    “If you are lucky enough to have repairman4 bid on your project, you should accept. Excellent communication and will continuously work until all project requirements are met.”

    fertuser2 Flag of United States 1 year ago.
    • C Programming
    • Linux
    • UNIX
  • image of imarotar2 Coding for small process $30.00 AUD

    “Awesome communication. Quality work. Highly recommended. Will definitely rehire in the future. repairman4 went out of his way to to help out and explain the final product. Thanks!”

    imarotar2 Flag of Australia 1 year ago.
    • C Programming
  • image of aldoilsant Compiling an open source command line tool for OS 10.6 (fairly urgent) - repost $45.00 USD

    “Great communication, lightning fast work, friendly and knowledgeable. Great to work with! Definitely rehire again.”

    aldoilsant Flag of Spain 1 year ago.
    • Mac OS
    • Shell Script



Jan 2009

Persistent Security is a software company I started several years ago after developing license software for 20+ years for a private company. My product, SafeGuard LM is the culmination of my work. SafeGuard LM is a great solution for large and small businesses that develop software that needs protecting from casual copying to full blown hackers. It has everything you need out of the box, including a Product Activation Server so you can activate your software over the internet. My passion in developme


Bachelors of Science

1979 - 1984 (5 years)


Windows NT Internals (1999)

Microsoft Corp.

This was an intensive developer class taught by MS personnel in Redmond Washington. One primary objective was to show how to update running application servers in place without having to shut them down.


Automatic Software Updates over the Internet

Back in the late 90's I proposed having users installed software automatically updated over the internet. Back then it was a big deal because we were still coming in over dialup lines. None the less, higher speed internet connections were on the rise and I implemented an automatic software update utility that would be able to patch our software over the Internet. Of course, in todays world, this is expected behavior. No one even thinks about it anymore but at the time and with the much slower in


  • Freelancer Orientation

My Top Skills

  • C Programming 27
  • C++ Programming 12
  • Linux 11
  • UNIX 5
  • Mac OS 4
  • Software Architecture 2
  • Cocoa 1
  • Objective C 1
  • Shell Script 1
  • Computer Security 0
  • Test Automation 0
  • Technical Support 0
  • Cryptography 0
  • Fortran 0
  • Solaris 0
  • Debugging 0
  • Socket IO 0

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