20+ years professional experience here, mainly in AAA art and tools dev but I do everything ( sound, music, design, programming and team management).
The requirement is not due to ambitions of quality ( I would like to keep it tiny and economic preferably, with innovation through creativity, not complex techhnology ), but a certain level of maturity and commitment to delivery is necessary for me to want to work with somebody.
My earliest collaborative experiences were in the Quake mod and European demoscene.
Me plus one programmer and one artist would be the ideal. Or just one or two people who are multi-disciplined like me. I have been writing in Javascript recently.