As dudul has already pointed out, freelancing websites are a completely different game, people bid at way too cheaper rates.

I did some competitions (Design and Development) on TopCoder during undergrad days and was lucky enough to secure a place in top 3 couple of times. Key there is to choose a contest with less number of participations and patience.

Other than that, weworkremotely.com helps, browse some recent whoishiring threads. Might want to have a look at jobcombinator.io as well.