It's all pretty clearly laid out on their website: 1. A 20 minute behavioral Skype call mainly to check for English proficiency. 2. 90 minutes to do 3 algorithms questions (all automatically scored). 3. 60 minutes to do 2 algorithms questions whilst sharing my screen with a Toptal engineer. 4. A web application to develop over a few days (had 2 weeks to do it). I spent a total of 4 days on it, but most of that time was me learning ReactJS (something I wanted to do anyway). The whole process took about 3 weeks, but that was mainly because I had a backlog of work to do for some clients. I probably could've got through the whole thing in 1 week if I had nothing else to do. I found the process as a whole to be challenging, but incredibly fun.