Dundrum is to get 400 new jobs over the next three years at CarTrawler, the Irish international car rental company, which has its headquarters in the area.
The first phase of hiring 200 new staff has already begun with recruitment in business development, customer operations, data science, finance and engineering.
As part of the company's expansion it will also be opening a new international customer centre of excellence in Dundrum, offering support to its customers in 174 countries.
"CarTrawler is a great example of an indigenous Irish company competing and succeeding in a global market," said Taoiseach Enda Kenny as the jobs announcement was made.
The company was set up in 2004 and provides aviation, travel, hospitality, leisure and consumer services with a direct connection to 1,200 independent car rental agents at 30,000 airports and cities.
"We are very pleased to be able to create these new roles in our country of origin, which will help to showcase our home-grown Irish business on the international stage," said CarTrawler CEO Mike McGearty.
"We continue to invest in our technology and our team to ensure that we remain the driving force behind car rental worldwide.
Jobs Minister Richard Bruton described the announcement as "a further great boost for Ireland's reputation as a source of innovative, fast-growing Irish companies".
Julie Sinnamon, the CEO of Enterprise Ireland, said the company was "a great example of how it is possible for an Irish company to develop into an international company of scale with positions in global markets".
The announcement was also welcomed by Fine Gael TD for Dublin South, Olivia Mitchell, who was pleased to see the Irish-grown company "reinforce their roots here".
"Despite the improvement in the economy, there is still a lot of unemployment in Dublin south," she said, adding: "These jobs are great news for Dundrum, which is a terrific location."
CarTrawler is hosting an open day on Saturday, October 18 at its HQ in the Dundrum Business Park. Book places via firstname.lastname@example.org