There is no exact number of times.
You can take the Technical Check-in as many times as you want. If you do not pass our technical assessment, we will provide you with feedback on how to improve.
If you have interviewed several times without making much progress, we may ask you to reapply.
This is based on our perception of your technical ability rather than a magic number you have reached. We do need to see some improvement in each interview in order to continue the interview process, however. If we feel that progress between interviews is not sufficient, we may ask that you take an extended break from the interview process to revisit the basics.