Software complexity stems from two extremes: overengineering with unnecessary patterns and oversimplifying complex domains. Essential complexity is inherent to the domain and unavoidable, while accidental complexity comes from poor implementation choices. Simply saying 'keep it simple' is insufficient—achieving simplicity requires deliberate effort and matching architectural patterns to actual problem complexity. Red flags include inability to deploy daily, fear of making changes, and team dissatisfaction. The solution involves using defensive programming, avoiding dogmatic approaches, mixing simple and sophisticated patterns appropriately, and focusing on shipping fast with incremental changes rather than premature optimization.
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