Apple Firmware Engineer interview questions

Screening interview based on my resume, python and C. After passing that 6 interviews going in details on various topics related to let, embedded c, rtos,signal processing and communication systems along with closing in C, MATLAB and python

5 interviews all technical with team members not really difficult then the offer got a few days to respond. The interviews were in Atwood days, 2 interviews and then the other 3 interviews and then the offer