Belfast businessman Philip Cassidy set up gem, the email contact company, in February 2000.
From just a handful of employees, the former Belfast Telegraph assistant accountant grew the firm into a multichannel contact company with a client list that reads like a who's who of global companies.
In 2011 it was bought over by California-based firm Concentrix, a division of the SYNNEX Corporation, for an undisclosed sum.
Following the acquisition Philip Cassidy took on the role of managing director – services Europe.
Concentrix now provides sales, customer service and tech support roles in 34 different languages and also has a social media and software development division.
The company has 8,500 people worldwide while the Belfast operation now has three locations where employees work on accounts with organisations such as Microsoft, Cisco, CA Technologies, ASOS, PayPal and Channel 4.
Headcount climbed by around 350 last year while turnover was up around £6m to £21.3m and profit by around £100,000 to £1.5m.
Concentrix has just revealed a jobs boost for Belfast of 100 permanent and 150 temporary jobs before Christmas.
Rob McConnell, chairman of Momentum, the voice of the digital sector in Northern Ireland, told Business Telegraph it welcomed the announcement, saying it was further evidence of an increasingly positive picture across the digital sector.
"Momentum launched its manifesto in January, highlighting how it was possible to create 20,000 jobs in the digital sector over the next five years.
"The weekly announcements of positive developments across the digital sector is proof positive of our analysis.
"Momentum recently announced its digital summit, due to take place in September, which will bring together government, the educational institutions and the sector itself to develop a plan to make this aim a reality."