Building an Upgradeable Lending Protocol on Ethereum This article is also available in Spanish This article presents the technical architecture and design decisions behind JVERA Lending Protocol, a …

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A walkthrough of JVERA Lending Protocol, a collateralized lending protocol on Ethereum built with Solidity 0.8.24 and Hardhat. The protocol uses OpenZeppelin's UUPS upgrade pattern, fixed-slot storage to prevent collisions across upgrades, and a credit-score-based borrowing model. Key design choices include a single entry-point contract, role-based access control, custom Solidity errors for gas efficiency, and a Hardhat test suite. The implementation intentionally omits liquidations and price oracles, positioning itself as a clean reference architecture for developers learning DeFi lending mechanics and upgradeable contract design.