Depends on the license. If it's permissive I'll pop open the code to see if it's any good. Maybe 50/50 it's good enough. From scratch only if I'm doing somethi

Depends on the license. If it's permissive I'll pop open the code to see if it's any good. Maybe 50/50 it's good enough. From scratch only if I'm doing something truly unique. New algorithm/protocol. Unpopular language I'm forced to use is missing something I need. Existing solutions too slow or buggy. Maybe a couple times a year I get to make wheels. NIH is a huge problem at most (all?) software companies. At my current place I spend about 1/2 of my time dicking around with crap internal tools and libraries. It's rare I write anything that's not glue code. Makes everything boring but I don't get paged often and we have relatively few bugs.