1st of all you need to Apply through online and need to submit fill up your all information Then Coding test of you can pass conding test though online portal then there will be a short face to face interview and go on.
coding test - interview1 - interview2 is a basic form of the process. Coding test in kakao is not easy. So if you gone through them the interviews would be relatively less competitive.
There are two high level coding accesments to get an interview you should pass so if you are not good at data structure or algorithms then you probably fail to pass it.