Yonatan Fields, ClickSoftware, Israel

GreenfieldTech is our partner for complex projects, as well as our “one stop shop” for new solutions that we regularly add to our IPT environment. Their professionalism and creativity impresses us time after time and we count on them for our infrastructure which spans five continents.

Freddy Rolland, Cisco R&D, Israel

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Nir instructed a Linux course for programmers in my company. He showed professionalism, and good personal relationships. Nir kept the good atmosphere and assisted also on questions beyond the course scope. There is no doubt that Nir masters the Linux OS. I liked to participate at Nir’s course and will be happy to do it again in the future.

Mushon Zer-Aviv

I have turned to Nir for consultancy on a pretty minor issue, when I was looking for VoIP solutions through a high-end global vendor. Nir has offered me a competitive proposal through Greenfield Tech and has delivered on it perfectly. I enjoyed using his simple and flexible API and would recommend his services to anyone interested in a grade-A VoIP professional. A real pleasure to work with. I am looking forward to our next collaboration.


Nir Grinberg, IsraelNumber.Com

I have known Nir few years, and have used his expertise and knowledge in few cases. During this time Nir has proven to have extensive know-how and experience in problem solving and problem approach menologies.
In all cases it was a pleasure working with Nir. The interaction was always professional and proved to provide an in-depth solution to our problems. Nir is a very nice person to work with, I will be happy to recommend him for what ever association he seems fit.

Greg Vance, APAC, Middle East, Africa Channels sales, Digium

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Nir is very knowledgeable about Asterisk/Digium products and he has successfully implement many custom applications. His work continues to be used in very large installations and his reputation is impeccable in the industry.


Dany Dolev, Senior Consultant, artNET experts

artNET experts_logoWhile working with Nir, I was amazed by his knowledge in telecommunications and security field. Nir is a real professional, constantly updating his expertise and always eager to help his colleagues and clients.


Patrick Perelsztejn, Manager of the Software Development Department, R&D, artNET experts

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As Senior manager at Artnet experts I have had the privilege to work with Nir who is highly skilled professional and a fantastic person.
I strongly recommend him to anyone who would like to work with him.

Boaz Refaeli, Kayote Networks

Kayote Networks
I have been using Nir professional services many times, and every time i get the best possible advice and implementation. Always knowable and always delivers as promised. It’s a pleasure to have such a professional.


Nir Ganani, Director, Integration Products, Interwise

I worked with Nir while CTO in Atelis PLC. Nir is very knowledgeable in what he does (in this case Asterisk IP-PBX) and combine rare technical and system architecture/broad picture abilities. He can go from system design to coding the system in no time. He has quick understanding of the requirements and ability to come up with applicable solution to the problem at hand. In addition, Nir have vast industry knowledge in his field. I warmly recommend him.


Gilad Ben-Yossef, Codefidence

CodefidenceNir is a professional and trust worthy business partner whose knowledge in Open Source IT platforms in general and Asterisk and telephony in particular make him an asset to every organization wishing to make full use of these technologies.