There are two books that really improved my software development skills when working on the backend. I have to admit that they are in some kind related to a specific technology / language. But the patterns are applicable in other languages too.
The first one is one of the best Node.js resources i've seen. The second book is not finished yet (bought the early access version via Manning Shop) but gave me a deep understanding of not just DI itself but patterns like factory, abstract factory, decorators etc. Very recommended!
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