Apple Developer interview questions

The project manager initiated the contact with me through LinkedIn, followed by a phone interview a week after. Subsequently, I was called for an on-site interview in Ang mo kio where I was asked about my work experience, some technical questions and finally given a Computer vision assignment. that should be solved within 45 mins. Though the assignment itself was difficult, I was able to solve it in MATLAB within the time frame. One month after the interview, I was interviewed again by a different member of the project through phone. Finally, I was rejected as my background (in mechanical engineering) does not fit the position. Whole process took 3 months and was grueling. If they wanted someone with Computer science degree rather than the necessary skills, they could have rejected me in the initial screening itself rather than going through such time-consuming process.