I hate to be that guy, but part time, evenings and weekend only, remote workers who want equity and not hourly/project compensation are basically the exact opposite of the type of employment arrangement startup founders are probably interested in. I'd be happy to proven wrong but sounds like a pretty raw deal for founders, since this type of arrangement not only dilutes them or takes from the options pool (which, if they are funded, is a much bigger deal than paying the person) but also introduces all kinds of overhead and unnecessary pain in dealing with the logistics and lack of focus the employee will inevitably have.

The only time this could be a good deal is if there was a real lack of engineering talent available for hire, so I guess if you consider startups outside of the talent hubs it could make sense. But even then, if the startup is considering remote workers, this is far less appealing than a full-time, M-F, salary based employee.