Taoiseach Enda Kenny has announced the creation of 610 jobs at Paddy Power at the opening of the bookmaker's new headquarters in Clonskeagh in Dublin.
The posts are in areas such as e-commerce, technology, social media, research, risk management and online marketing.
The jobs will be created between now and the end of 2015.
Paddy Power has created 190 jobs since the beginning of April and it currently employs 2,172 people in Ireland.
Ireland's largest bookmaker, which is one of the biggest companies on the Dublin stock exchange, saw its revenue grow by 29% in the first half of this year.
Strong international online growth in recent years has seen the company expand its operations into the UK, Australia and Italy. It has also located resources in the US to prepare for a launch into the online market there. It now generates four fifths of its operating profit from its online operations.
''We are hiring at an increased rate and investing heavily in e-commerce to capitalise on the structural market growth and emerging opportunities around the globe as more and more countries licence online betting and gaming,'' commented Paddy Power's chief executive Patrick Kennedy.
He said the company is ''born and bred'' in Ireland and it takes pride in continuing to create high quality jobs ''with the associated economic multiplier effect in this country, particularly given the current economic challenges''.
Taoiseach Enda Kenny said the jobs news shows how Irish companies can embrace change and respond to new opportunities. ''I commend the company on its commitment to Ireland and in particular its commitment to retaining and developing Irish graduates,'' he added.
The jobs announcement comes just days after food company Kerry Group, another of the Irish stock exchange's largest companies, said it would hire 900 workers for a new food technology centre to be built in Naas, Co Kildare.