More than 400 jobs are set to be announced in Dublin this morning.
Social-networking giant LinkedIn is to add to its 1200-strong workforce in the capital.
Business Minister Heather Humphreys will attend the announcement in the company's base in Wilton Plaza.
Dublin's Lord Mayor Paul McAuliffe says it is a huge boost: "Well I'm really delighted to see this investment in Dublin.
"I know Silicon Valley and Dublin City are twin cities and we've put a lot of investment into trying to attract companies like LinkedIn to Dublin.
"I had a great meeting with the co-founder of LinkedIn Allen Blue on a previous visit and it's fantastic to see them invest in their Dublin site."