Slot: systems

Operating systems, drivers, runtimes, anything close to the metal.

A product is a set of slots to fill: browser, server, database, deploy. A language fills some of them well, some badly, some not at all. A stack is one pick per slot.

browser server database systems mobile cli scripts data compute embedded wasm config games

Who fits

Language	Fit
Rust	●●● strong
C	●●● strong
C++	●●● strong
Zig	●●● strong
Go	●●○ ok
Kotlin	●○○ weak
Python	●○○ weak	CPython itself is written in C.
Bash	○○○ none
C#	○○○ none	Kernels and drivers are written in C or C++, not in C#.
JavaScript	○○○ none	Engines like V8 are written in C++; JavaScript does not write kernels or drivers.