How NFT Marketplaces Work: The Full Technical Pipeline Explained

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A detailed technical breakdown published on DEV Community explains the end-to-end engineering behind NFT marketplaces, targeting developers who want to build or audit such systems. At their core, these platforms combine on-chain smart contracts, a backend API with database indexing, and a frontend interface connected to wallets like MetaMask. The article walks through key stages including wallet authentication via signed nonces, on-chain minting using ERC-721 or ERC-1155 standards, and the tradeoffs between eager and lazy minting approaches. It includes annotated Solidity code and architecture diagrams to illustrate how each layer interacts. The piece emphasizes that neither smart contracts alone nor a backend database alone constitutes a true decentralized marketplace — both are essential.

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