Apple Cellular Protocol Development Engineer interview questions

Breakdown: 1) Phone Interview Round 2) Onsite 5 Rounds were held and accepted 3) Director Round was difficult and was the last technical round. 4) Senior Director Round 5) Decision told by HR

Interview consisted of an initial phone screen and a final round. Phone screen asked an easy/medium C question. Final round was 6 technical interviews of 45 mins each, back-to-back with 1 hour break for lunch. Some technical interviews were required to be done in C, others allowed any language. Interviews included leetcode style algorithm questions, C specific questions, and C knowledge questions. Last round of the day was interview with hiring manager, going over resume and asking some C knowledge questions. Stamina is very important for this interview, as it lasts a whole day (~7 hours).