ALSTOM Embedded Software Designer interview questions

One of the HR from Alstom called for this requirement by looking at my profile in Job portal. Explained over the phone about the requirement. Scheduled for a first technical interview. It took almost 90 minutes and then met with Director, he described about company and expectation from candidate. No calls for 2 weeks. Later called for one more technical interview followed by HR interview. It took almost month to get offer. Interview was pretty simple. Asked basics of C, C++, Multithreading ,RTOS concepts, Python.