Q: Harry often wondered about his parents lives before he died. What did Lily, James, Remus [Lupin], and Sirius do after Hogwarts?

JKR: To take Remus first, Remus was unemployable. Poor Lupin, prior to Dumbledore taking him in, lead a really impoverished life because no one wanted to employ a werewolf. The other three were full-time members of the Order of the Phoenix. If you remember when Lily, James and co. were at school, the first war was raging. It never reached the heights that the second war reached, because the Ministry was never infiltrated to that extend but it was a very bad time, the same disappearances, the same deaths. So that's what they did, they left school. James has gold, enough to support Sirius and Lily. So I suppose they lived off a private income. But they were full-time fighters, that's what they did, until Lily fell pregnant with Harry. So then they went into hiding.