Full-Stack Web3 Developer - ERC-4337, Polygon & Smart Contract Lending Platform

Job Description We are looking for an experienced Full-Stack Web3 Developer to develop a blockchain-powered academic and community library platform called Coinstar. The platform combines a traditional digital library with BOOKZ token rewards, escrow-based book lending, ERC-4337 smart accounts, and gasless transactions on Polygon. Key Responsibilities - Develop the Student Portal and media catalog - Implement book search, filtering, reservations, and loan management - Integrate BOOKZ token functionality - Develop and integrate escrow smart contracts - Implement ERC-4337 smart accounts and paymaster/gasless transactions - Build token rewards and transaction history - Connect frontend, backend, database, and blockchain layers - Implement secure authentication and role-based access - Optimize the platform for production security and scalability Required Skills - Solidity / Smart Contract Development - React / Next.js - TypeScript / JavaScript - Node.js / API development - PostgreSQL or similar database - Polygon / EVM - ERC-4337 / Account Abstraction - Web3 wallet integration - Blockchain security Experience with DeFi, tokenized platforms, escrow systems, or Web3 marketplaces is a strong advantage. Project Goal Build a production-ready Web3 library platform where users can reserve books with BOOKZ escrow, manage loans, return books, release escrow, and earn reading rewards.