I run a Discord community [0] around software internals for folks interested in hacking on databases, compilers, browsers, emulators, etc.

There's a jobs channel there where folks post jobs on these topics there. If you've got these kinds of software internals jobs you're welcome to join and share. If you're looking for these kinds of jobs you're welcome to join and browse.

Unlike OP's site this isn't tied to particular technology/languages/frameworms but tied to particular interesting topics.

[0] discord.multiprocess.io