The grep one sounds pretty fun actually, it's less about "skill" imo and more that I'd love to see your concept expanded to some of the less travelled parts of

The grep one sounds pretty fun actually, it's less about "skill" imo and more that I'd love to see your concept expanded to some of the less travelled parts of programming. Runtime linker/loaders, compilers, display drivers, VMs, VMMs, symbolic execution stuff. Maybe a build your own eBPF course or clangd?