3 personal interview + 2 design interview + 1 manager interview. I have a feeling that they are not really hiring but rather do interview training. Coding part is fun, but the ppl who asks for design question seems not able to ask reasonable question. They simply don't care. It is a little annoying that company like square are having fake job interviews. The interview might be another way of square engineer to learn from other company and also show others they are actually growing and hiring.