A total of 450 new jobs at Ebay are on the way to Dundalk.
The jobs are in customer services, sales and compliance and are part of the company's shared operations with Paypal.
The announcement is being made by the Taoiseach Enda Kenny and Jobs Minister Richard Bruton in Dublin this morning in conjunction with IDA Ireland.
The jobs are on top of 1,000 jobs announced at PayPal last year, which are also based in Dundalk.
Taoiseach Enda Kenny said it was an "exceptional" development for the country, and the north east in particular.
"The fact that global technology leaders like eBay and PayPal are expanding their operations here shows that we have the local talent pool, infrastructure and business environment to attract high quality investments," he said.