I have had really bad experience with twice in a row. A few months back I had applied at Athena, after a month or so I received some messages to set up an initial phone screening with Amber Jackson.

I spoke with her and she said after the phone call she will send me a puzzle to solve. But guess what she never sent me any puzzle. Neither did she reply to my messages. A few months later, a consultant sent my resume to Athena. The consultant gave me the puzzle which was sent to her by Amber. I solved the puzzle and asked Amber to acknowledge that she has received my solution. From that day onwards no reply yet, it's been months.

Puzzle to solve are fairly time consuming.