You must have been in the industry for the same time as me. Your ratio of interviews to offers is kind of encouraging, and at the same time depressing - I have

You must have been in the industry for the same time as me. Your ratio of interviews to offers is kind of encouraging, and at the same time depressing - I have just changed jobs and got a number of rejections. What bothers me most is the time wasted on throwaway "technical challenges" where the reasons for rejection are mostly outside of the specification, and a perfect solution would be in the order of a weeks work, not the few hours that they said it should take. I have a full time job and limited free time to put into these things.