Got a coding challenge where I was supposed to build an application from scratch. App should receive commands for creating a canvas, drawing lines, rectangles and Bucket fill. I used 1 1/2 day on this. This was apparently not enough since this was the feedback: * readme has design discussions Well, I have to convey my thoughts to you somewhere don’t I? Is that a MAJOR problem? * some validation working * reverse lines/rectangles work * (some) graphical acceptance tests * readme has no run instructions Is that a MAJOR problem? * easy to cause crash with incomplete/invalid commands: 'C' or 'L -1 -1', 'C 10 -1’ Sorry should have tested for negative values, easy to fix in one place. * can't refill or fill lines Is that a MAJOR problem? * test named: '"App" should "have tests"' with implementation: true should === (true) * no test coverage apart from acceptance tests (which don't exercise full set of commands) Is that a MAJOR problem? * control loop logic intermixed with parsing * canvas operations return an array of strings instead of the canvas. Sorry, this is unnecessary since I use toStringArray() later anyway so toStringArray is executed twice. * sealed class with "getters" used instead of case class Is that a MAJOR problem? * no encapsulation of fields or private methods within classes (Canvas/Cell) Obviously these was major concerns. ALL tests should be done and ALL possible errors should be catched. I think is is VERY much to demand for a initial coding challenge. Should you put one week of work to be able to talk to the company?