Meta Software Engineering interview questions

one hackerrank, three technical interview. the hackerrank question is fairly straightforward but easiest to do in higher level language. technical interviews were okay, but not hint-ful or anything. made a stupid mistake in the last one and it cost me a lot :(

Phone interview: create an algorithm to check if two strings differ by one character. On site interview: 4 consecutive interviews (1 personal, 2 technical, 1 architecture). personal - count 1 bits in UINT architecture - some design with Redis/Memchached technical 1 - Contact lists merge (data structure question) technical 2 - Simple regex matching