Up to 100 jobs are being promised over the next five years for Ballincollig in Co Cork by a Canadian cyber security company.
eSentire plans to establish a European headquarters and security operations centre with support from the Department of Jobs, Enterprise and Innovation through IDA Ireland.
Minister Richard Bruton said: "Cyber security is a specific area which we have targeted as part of our Action Plan for Jobs, and in recent years we have seen an impressive performance in this sector.
"Today's announcement ... is another important boost".
eSentire's Chief Technology Officer Mark McArdle said the company had evaluated several European locations when planning the expansion.
He said they were "extremely impressed with the technical talent in Cork and the ecosystem the Government has helped to develop to fill the skills gap, specifically in the demanding and competitive field of cybersecurity".