Ask HN: Technical books that are must read for a developer with SAAS product?

This is a life or death situation, have wasted the past 5hours surfing the internet to find the perfect book. I have read a lot of non-fiction books during my commute. Now trying an experiment to read technical books. I started with Elements of Programming Interviews to learn about algorithms but it looks like I will never see these problems in my daily life. I am an embedded software developer, and have a few saas products on the side. Considering, Head First into Design Patterns, or Operating Systems Concepts by Tanenbaum next but I am open to any other book that will give me a technical braingasm. SOME RULES: The book should not be a reference book like the art of computer programming or CLRS. It should be beginner friendly considering I am a self taught developer. It can be of a particular niche, i.e. something about ai, blockchain, OS, functional programming. It should be something that improves me as a developer. Something that changed your mindset about programming, or software development thanks, do let me know if you want me to refine my question...