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Use existing human knowledge (e.g. open source software). The wheel has been invented already. We are on the shoulders of giants.
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Be a giant for others. Share your solutions.
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Embrace helpful paradigms, such as functional programming and its pure functions and immutable objects. They will discourage complexity and silence those who question if you are web-scale.
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Use hashes and cryptographic signatures routinely. Data may be corrupted or tampered with at any time.