Had an invite to CodeSignal to do an online assessment, 3 typical algorithm questions, 2 were easy, 1 was easy-medium. Completed all 3 tasks fairly easy and passed all the tests, even had time to optimise this but after 1 week of no response, got a rejection email with no feedback. Terrible waste of time, especially having got the correct answers to all 3 Qs, to have been rejected with no feedback is incredibly disrespectful and makes you doubt whether they even look at your code or just rejected you on a whim. DO NOT WASTE TIME TO EVEN APPLY.