Almost 170 new jobs have been announced for Dublin.
Two thirds of them are at software company Intercom, which brings its workforce to 240.
Intercom, based in Dublin and San Francisco, provides a customer communication platform for internet businesses.
It was started by four Irish men in the US five years ago and has just secured another $50m in private funding.
The company already employs 140 people at its base on St Stephen's Green in Dublin city centre.
The latest funding round, which brings overall funding raised over the past two years to $110m, was led by Index Ventures headed by Dropbox boss Ilya Fushman.
Intercom currently counts 10,000 paying corporate customers including the likes of IBM, Dropbox and Rackspace across 90 countries and uses the bulk of those revenues to reinvest in product development and hiring growth.
Paul Adams is Vice President of Technology at Intercom says they will be looking for software engineers, designers, and product managers, among other roles.
A further 30 positions have been announced at CXC, a firm based in Smithfield which provides corporate advice.
The new jobs will be in the areas of multi lingual sales, marketing and support at their new European Hub in Dublin.
Meanwhile, technology firm Pure Storage is doubling its 18 strong workforce at a new support centre in the capital by the end of the year.
Finally, 18 new jobs have been created with the opening of a new Lidl supermarket in the East Wall.