A walkthrough of designing and implementing a Decentralized Autonomous Organization (DAO) from scratch using Solidity, Hardhat, and Ethers.js. Covers the core architecture including governance token design (ERC-20 with weighted voting and snapshot logic), proposal lifecycle as a state machine, on-chain voting mechanics, quorum validation, and security protections like double-vote prevention and single execution guarantees. Discusses trade-offs between on-chain vs off-chain voting, gas optimization, and recommends OpenZeppelin Governor, Timelock contracts, and MultiSig layers for production-grade systems. Future improvements include quadratic voting, vote delegation, and IPFS metadata storage.
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