After applying on their official website, you will get a week to complete a Project using Golang or PHP. The project is shared via Github and you can discuss about it with their engineers in issues.
Questions d'entretien [1]
Question 1
Design a banner feature to show banner for Mercari app. Every banner has a start time and end time, while only one banner is chosen to show from all active ones.
J'ai postulé via un recruteur. Le processus a pris 1 semaine. J'ai passé un entretien chez Mercari (Tokyo) en juil. 2019
Entretien
A recruiter approached me about the opening and then I was invited to their online test and was asked to build an API for a module of an application. The thing is, the requirements are very vague, I had to ask and clarify the requirements several times and the answers were always given more than a day after the questions were asked. Mind you I only had one week to finish the test. I ended up being rejected but didn't find out about it until I followed up to the recruiter.
The least they could do is notify me directly and give feedback, not just give arbitrary reason like "not up to their bar".