Had a total of 3 phone interviews, last one was a role play. Everything went really well or that's what they made me believe. HR (Dublin office) sent me an invitation for the 4th and FINAL round (face to face) but for a day earlier of the actual meeting by mistake. So imagine yourself going to that final interview thinking there is a good chance after the great feedback received (and all the time spent preparing those interviews), then once at the office someone comes to you and apologises because there was a mistake in the invitation email and asks you to come back the following day for that interview. Ok. Then you leave the premises and straight after that you receive an email from HR (Boston office) stating you are not successful for the role. Another mistake I thought? To be clear, I asked the person I was meant to meet the very next day if that was another mistake but he wasn't aware. Few emails later I discovered they gave the position to someone else. Worse interview process I've ever experienced.