The parts nobody pays him for.
Four things he goes properly deep on outside the invoiced work: silicon, game engines, taking systems apart, and reading source rather than documentation. Most of the opinions on this site come from here.
Silicon
Building processors, down to the mask
Most people who talk about AI stop at the API. He went the other way and worked down through the open-silicon flow - Verilog on an FPGA, then the Zero to ASIC course on the open Skywater process, plus the VSD physical design track. Custom processors and the ZipCPU end of the world: what a chip is actually made of, rather than what a datasheet says it does.
Engines
Writing the engine, not just the game
He wrote Precious Engine, a 3D game engine, from scratch - and then published the architecture documentation for it, which almost nobody does. On top of that: Unreal, Unity, and thirteen years ago the programming on Rune Fencer Illyia, an indie title that closed its Kickstarter at 150,000 USD. He founded Bahrain Game Developers in 2012 and it still exists.
Taking things apart
Reverse engineering and offensive security
An ethical hacker by background, and still the fastest way he knows to understand a system nobody documented. Penetration testing, malware analysis, and pulling binaries apart to find what the source would not have told you. Google and ISACA have both put him in front of a room to teach it.
Reading the source
Going into the library instead of calling it
The habit underneath all of the above: when something matters, read what it actually does. He has taken a room through TensorFlow's own source at Google rather than its documentation, and the same instinct runs through the compiler and systems work. It is also why the opinions on this site tend to be unromantic - it is harder to be impressed by a thing once you have read it.
