Simply put, destructuring in Clojure is a way extract values from a datastructure and bind them to symbols, without having to explicitly traverse the datstructure. It allows for elegant and concise Clojure code.
In a perfect world, where things are done well, not just quickly, I would expect to find the following when joining the company:
Documentation
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Accurate / up-to-date systems architecture diagram
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Accurate / up-to-date network diagram
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Out-of-hours support plan
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Incident management plan