Things like the FB app is really a function of the amount of code and developers working on it at once. Amount of code is a function of the number of engineers

Things like the FB app is really a function of the amount of code and developers working on it at once. Amount of code is a function of the number of engineers. It's a social organization issue & a big company issue more than anything else. If facebook removed the algorithms part of their interview through a time machine, the same issues would of still cropped up. Also in backend & foundational infrastructure stuff where you go make compilers and base foundational libraries, you do tend to use those algorithmic things once in a while. You use stats in analytics & data science and you math in ML and other initiatives. FB isn't just CRUD construction workers after all :p