We built our own applicant tracking system instead of buying one, and I did not write a line of the code by hand. What that changed for the colleagues who open it every morning, what it cost, and the number of things about it I still cannot tell you.

My experience after one year at InfiniSwiss.

A list of guidelines extracted from the book "Clean Code: A Handbook of Agile Software Craftsmanship" by Robert C. Martin