My schedule is not intense as yours but I do have a 2 year old, who keeps me busy after work. I prepared for couple of hours every night after he went to bed for about 3 months, mostly doing problems on Leetcode. I ended up getting to the onsite rounds to three FAANGs and one offer. I also did some mock interview with help of a friend which helped.

Hi there! I recently applied to a similar role through linkedin and did a take home assignment but apparently my submission was not good enough. I kind of liked this step and was disappointed to know that I failed. Worse was not receiving any feedback or at least a code review round, which could have helped me improve, specially after spending 6 hours on it. :( What would be your advice if I apply again in future ? Thanks!