the premise of this thread seems to be well-meaning, but is flawed and impractical.
in software development, you can't just throw money -- especially temporary for hire money -- at the problem.
it has to be built-in, planned, architected, scaled, and provisioned for, for the the long run. a company can't run a yearly development cycle and business based on the hope they may or may not get donations.
the hire would have to be mentored in to a decades-old codebase.
no developer of this caliber would do this on a six month or year-long stint. it's a major career choice.
there are not many software developers in the world that have this kind of experience. this is the kind of thing where someone from, say, steinberg leaves and joins presonus (a real example of the two founding presonus engineers). is someone like that going to take a 3 month donation fund? no way. they've got families to feed, probably.
so, are you really proposing coming up with a six figure salary x 3 years minimum? cuz that's what it would take -- for just one developer of the kind of caliber they require.
all this is moot, anyway, the person best suited to fix the bugs is the engineer that created them. you hire outside help to add self-contained, product-ized new features, not to try to dig through someone else's code to fix their bugs.
you should forget about this, apply for a beta test position, and if accepted, actively contribute to it.
there are no more or less bugs in Sonar than any DAW. not being a Sonar fanboi -- i've mostly switched to Studio One, actually. :blush: