Indeed, hackathons seem like a natural fit to engage developers with Grants 2.0. Something like the GitcoinDAO Hackathon, which I proposed a while back, might be a good framework for judging and rewards: GitcoinDAO Hackathon 2022.
Relatedly, @brent brought up "Moonshot Collective speed hackathons.“
Besides hackathons, I could also see Grants 2.0 specific quadratic funding grant programs to fund related development work.
dogg fooooodin‘