Marc Tremsal

Here are some technical books I've read and found particularly insightful.

Hardware & OS

How Linux Works, 3rd Edition by Brian Ward at no starch press
The Secret Life of Programs by Jonathan E. Steinhart at no starch press

Erlang & Elixir

Elixir in Action by Saša Jurić at manning

Non-CS Engineering

Structures by J.E. Gordon at hachette books