Phone interview followed by onsite with five engineers. Very firmware knowledge based questions and all coding. Need to know basics well and should be able to tackle system design questions

after short communication I've selected timeslots for the interview 1) interwiev with the HR about role and skills; 2) technical inerview where you should solve the task (using IDE is prohibited) company didn't provide you a feedback about you intervie and mistakes, but after all steges I've received some emails from company asking fill the feedback form