Two complementary approaches to building software systems are explored: building up (starting with a solid foundation and gradually adding functionality) and sanding down (starting with a rough prototype and iteratively refining it). Building up works well for known domains with clear specifications, emphasizing correctness and strong abstractions from the start. Sanding down suits creative projects requiring experimentation, focusing on rapid iteration and deferring perfectionism. The choice depends on team dynamics, problem familiarity, and project nature. Examples include implementing protocols with Rust's type system versus iterating on game mechanics with minimal framework overhead.
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