If I were you, I'd either: 1.) Keep contributing to open source and working on/releasing/blogging about/otherwise promoting side projects. 2.) Contact founder

If I were you, I'd either: 1.) Keep contributing to open source and working on/releasing/blogging about/otherwise promoting side projects. 2.) Contact founders directly via email and ask about job/contract opportunities. The bigger your profile/the more samples of your work out there, the easier it will be to get positive responses out cold emails.