Ask PG: What Counts as a Founder in the App?

My team has one team member who wrote a bunch (maybe 1/3?) of the code we have so far and who is very into the idea of working on the startup with us, but who can't work on it very much now because he has a job that he isn't ready to leave. He definitely can't move to California, but he wants to do as much as he has time to on nights and weekends. He will have have equity. My question is, for the purpose of questions on the application, is he considered a founder?