I applied online. I interviewed at Eir (Cork) in July 2019
Interview
First stage was phone interview, on 2nd stage writing and and face to face interview. Then writing test again after a month of training. If you fail then you have one more chance to take the exam again after going through all the preparation
I applied online. The process took 5 days. I interviewed at Eir (Dublin, Dublin) in June 2014
Interview
2 stage interview, first call screening then face to face, if pass then another face to face at the relevant department. if thats successful then you receive an offer an thats about it