Sure. It has signed and unsigned numeric types with specified sizes, and the "unsafe" module provides some alignment and even pointer arithmetic capabilities if you really need to tell the computer everything.

I'd just except the very end of low level stuff from it, mostly due to maturity and GC issues, so it wouldn't be my choice of language for a embedded real-time situation. If you're talking web server/3D game low-level, it's fine.

To me, go looks like C programmers copied Modula-3, whereas Java was Cobol programmers copying Modula-3...