Application through agency, phone interview, online tests, interview by AT&T management staff and HR. All went smoothly, until HR department from Bratislava got involved in process in the moment when I already got the job offer. Then everything slowed down and at times looked really unprofessional from them. HR lady from international staff took more than a week to call me, although she sent me a mail stating 'I'll call you tomorrow'. I even tried to contact her to check is everything OK with a offer, but she never answered my calls.