They don't have HR, so your first initial phone screen will be technical and he will ask some basic/fundamental questions about CSS, JS and a framework that you used before. If it goes well, then on-site interview. You don't need to prepare for on-site because even they don't know what to ask. The final round is with a Manager but you should read the reviews before the final round or on-site :) Very unprofessional and disorganized.