Codingsignal is used for coding assessment before any real interview is given. This is very awkward, time-consuming, and error intolerant. They messed up my uploaded pictures, one of myself, another of my driver's license. There was no warning at the beginning of my coding process to tell me that they did not receive my driver's license picture, but at the end, the next day after I submitted my solutions, I was told they could certify my result because they received two pictures of me and there was no picture of my driver's license. I cannot understand how hard to detect a driver's license picture and make sure the pictures uploaded are fine before kicking off the multiple hours coding test. The platform could be much better in this regard. Anyhow, their customer service was helpless too. So that is it. The company treats an uncertified test as a failed test.