Expert C# Business Objects

This book has software engineering concepts that I never did see or hear anywhere else: "Expert C# Business Objects". Its concepts are language agnostic, even though it has C# examples. You might try some videos by the author of that book too. Related to this book is what we call "vertical feature slicing". (I'd be curious to know what other books cover this topic.) There are some Youtube videos on the topic. There was a great 2-hour video from 20 years ago that influenced me. Unfortunately, I don't remember the title and cannot find it today. The video "Simple Made Easy" had a profound influence on my programming: https://www.infoq.com/presentations/Simple-Made-Easy/