Alex West's blog: see how he managed to make a successful startup in public, I love how candid he is in his posts about his progress
Julia Evan's blog: interesting and often complicated computer concepts explained visually and in great clarity
Choreography vs. Orchestration: An interesting AWS Step Functions use-case, also helps with better understanding of event-driven vs. message-driven architectures.
Crafting interpreters: Implement your own interpreter and in the process learn how compilers/interpreters work.
Grokking simplicity: I'm still reading this one, but even reading the first few chapters gave me a lot more insight about functional programming and how to use them to think about every-day programming problems