Maintainer of the Puma Ruby web server. Also runs a Rails consultancy agency which effectively funds his Puma work. At RubyConf EU earlier in 2023 he argued that the way to fix under-paid open-source heroes is simply to start paying them — the customers (dependents) should support the maintainers. Donarski agrees theoretically but disagrees pragmatically, arguing the current sponsorship/bounty modes don't scale.