The expansion at the company's Ballygowan Road headquarters is to house support and sales teams following the announcement that Rainbow is the only direct business partner of EE in Northern Ireland.
Also unveiled, was a hi-tech presentation suite which will showcase the latest in cloud and VOIP technologies.
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Director of Rainbow Communications, Eric Carson, who will celebrate a half century working in the industry later this year, said: "I wish to thank the Minister for taking the time to visit and open our new offices.
"The company has witnessed huge growth in our mobile offering working in partnership with EE and our expansion into Scotland has also proved a resounding success.
"Our new offices will house our new data and I.T division and we expect more job creation in the coming months as cloud telephony and its benefits are exploited by companies here and in Great Britain."
Mr Hamilton said: "Rainbow truly is a Northern Ireland success story. It's a company that has developed its products and services to ensure its customers benefit from the latest technologies.
"Despite the economic conditions, the directors have invested for future growth, a bold step which is already paying dividends with plans for more job creation later in the year.
"I wish the company continued success both home and away."
(CD/JP)
