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Many of the Humble Tech Book Bundles seem like they offer little to no value. But this one looks like a good value of you're interested in any one of the books available.
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Software architecture is the skill that I don’t have and I bought that bundle. Some books are unrelated to my job (like micro services) but it looks great.
Even if you don’t work with microservices, but with traditional monolithic applications, you might find some of the base principles useful, as they applies quite universally.