Developer shares key production lessons from building a real e-commerce system

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A developer recently built a production-grade e-commerce system and documented the complex challenges encountered beyond basic functionality. Inventory management emerged as a critical concern, requiring safeguards against overselling and race conditions that beginners often overlook. Cart synchronization proved unexpectedly intricate, demanding frontend validation, localStorage management, and database syncing. A notable edge case revealed that a failed order does not guarantee a failed payment, highlighting the need to track all transactions for refunds and support. The project underscored that production systems must also address fraud protection, payment disputes, customer data privacy, and background database maintenance — concerns rarely faced during development.

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