Taoiseach Enda Kenny has declared Ireland the "internet capital of Europe" as two US-based online companies revealed plans to create 260 new jobs.
Internet search engine Yahoo said it will take on 200 more staff as part of an expansion of its Dublin operations centre over the next year.
Separately, online security company McAfee is to recruit 60 people for its "centre of excellence" facility in Cork.
The job announcements were made as Mr Kenny met bosses at both of the firms in California, where he is on an official three-day visit.
"Ireland is becoming the internet capital of Europe, with companies like Yahoo offering great opportunities to our passionate, highly-skilled workforce," he said.
Recruitment has already started at Yahoo for customer support, technology, operations, human resources and finance roles to support its business across Europe, the Middle East and Africa.
The search engine has had offices in Dublin since 2003.
McAfee said it will create 60 "high-quality" jobs at its Centre of Excellence for Enterprise Security Solutions in Cork.
The software engineering roles will work on designing and building new features for the company's customers.
Both Yahoo and McAfee have received taxpayer-backed IDA support for bringing the jobs to Ireland.