CERN interview questions

Three-stage interview. First was asynchronous interview using Sonru. The second stage was the coding exercise and finally panel interview followed by a test and "meet the team activity" (all 3 activities in one day). To sum up, I invested like 8 hours total of my time in this process, and in return, I received 50 seconds voicemail message around 19 on Friday with feedback that they selected someone from inside CERN (there were 3 other people besides me in the final stage). The message included a promise that if I want to hear more feedback I should contact. I wanted to follow up to receive more info, called back 2 times, mailed once but I got no further response. This is my real issue with this process, I invested so much time to get 50 seconds in return. I would definitely score this experience neutral or even positive if I would get more in return.

Submit forms that included questions linked to nationality, education, experience, motivation. Asked for recomendation letters also, followed by an automatic video interview via SONRU. The whole process is quite clear but i wasn't invited to a call or nexr interview after SONRU.