> How do you become a "senior developer" without knowing this? That was one of the first data structures I learned about when I was 15. I swear I've interviewe

> How do you become a "senior developer" without knowing this? That was one of the first data structures I learned about when I was 15. I swear I've interviewed several senior developers who couldn't even vaguely describe what a linked list or a hash table was. I don't know how anyone can say that's not a bad sign.