I'm not an uber user, but I found this:  http://www.irishtimes.com/business/technology/uber-to-drive-deeper-into-ireland-with-ride-sharing-pilot-1.2431019

Although they did a 'Soft Launch' in Dublin a while ago, I can't say how pervasive they are elsewhere in the country.  There are rate pages for Cork and Galway . . .

http://uber-rates-galway-ie.uber-fare-estimator.com/     . . .  BUT,

Trying a cost estimate from the Cork Kent Train Station to MacCurtain Street     http://www.uber-fare-estimator.com/route/3f8s       gave me THIS result:

     " Oops, Uber is not available for the requested route, but it looks fun though! Please try to make a new Uber Estimate again here. "  which leads me to believe that service is either spotty or unavailable.