## What You'll Do - Integrate blockchain (Ethereum/Hyperledger/similar) with existing Express.js APIs - Develop smart contracts for transaction validation - Ensure dual storage: MongoDB + Blockchain - Document everything for future maintenance
## Must Have - Blockchain development experience (Ethereum, Hyperledger, etc.) - Smart contract development (Solidity or equivalent) - Node.js & Express.js - MongoDB - RESTful API experience
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