We agree a first 30 min interview with HR. We discuss basic matters like why the company, why the posicion, etc. We also set the next interview with the CTO and I receive an assigment whithout deadline. CTO was late for the interview, it was only 20 minute and he didn't ask me anything. He only explained me how the company works. I solved the assigment in a couple of days and sent it. They promised to give me a feedback of it. After a month of sending it, no feedback at all. I sent an email asking for feedback and what the status of the hiring process was, to discover that the position was closed. They did not have the courtesy to communicate the outcome, after all the time I invested in the process.