Consults

A read of an existing codebase and a written route out of it: what to keep, what to replace, what it costs to leave alone. You get the notes, not just the call.

What to build first, what to leave out, and which of it is genuinely hard. Ends with a scope you could hand to somebody else.

Kernel work on AMD hardware: where the time actually goes, whether the vendor library is already beating you, and what a measurement would have to show to be believed.