Same here. last week I was sent a Codility test, tried the demo and failed miserably. Then I noticed the test was expressing constraints using time/space compl

Same here. last week I was sent a Codility test, tried the demo and failed miserably. Then I noticed the test was expressing constraints using time/space complexity, concepts I was completely unaware about for my previous 15+ years in the profession. So now I am reading about algorithm theory face-palming at the realization I have reinvented the wheel many times during my career instead of just re-using a PhD. researched algorithm.