All the developers currently active in OpenBSD have followed the same

process: scratch their own itch.
Start using OpenBSD. Notice things which are not perfect (there are a lot

of them), fix them. Get noticed. Once you send enough correct fixes, you

get an account. If your fixes are bogus, we will usually tell you they're

bogus. It's not our job to hold your hand.
We value autonomy a lot. It's fairly easy to find things to do: just look

on the various mailing-lists. It's very easy to find stuff at your level,

whatever that might be.
Don't expect to become a rock-star overnight. All people in OpenBSD have

grown over the years. The best way to do sexy things is to start with

the grunt work, and to move up from there.