Long story short, after being assigned a few purely backend-related tasks, I realized that this appeals to me much more than data science. It turned out pretty naturally that within my current team I can gradually become more of a backend engineer (we use Go). 
In general, I have had experience (mostly with Python though) with web-frameworks, used SQL a lot, Docker, CI/CD, even some Kubernetes, but I cannot get rid of the feeling that there are still so many foundational gaps in my knowledge that it's only a matter of time when I say or, even worse, do something stupid that will sabotage my chances of being considered a backend engineer. I am, however, really willing to fill all those gaps.Can you please recommend a really short list of books that are must-reads in your opinion?It's no secret that Designing Data-Intensive Applications by is a gem. I have read around half of it and it has greatly improved my understanding of the basic concepts.I am also thinking of watching the CMU's course on database design by Andy Pavlo. It has great review and I notice more and more frequently that a decent understanding of databases is something that helps you stand out and impress interviewers.It also seems a good idea to read Computer Systems: A Programmer's Perspective by Bryant and Helleron to cover the fundamentals of hardware and software. Even though I have a master's degree in computer science and mathematics, the focus was really much more on the math side so I guess that would help.I am wondering whether I should read something on operating systems. Based on the contents, the book by Bryant and Hallaron covers the basics of operating systems so probably that could be enough so that I am not a total noob in how operating systems work under the hood. Need your advice here.Currently, I am also reading A Philosophy of Software Design. It's a great read and I have noticed many times that it's considered to be a less radical and more modern alternative to Clean Code.What should I read on software architecture and design? I wanted to start with the traditionally recommended Clean Architecture by Uncle Bob, but then after reading a series of posts on why the book shouldn't be recommended anymore, I am no longer sure. What are less controversial options to cover this area?Thanks in advance!