Blockchain Full stack developer

## Tech Stack
- **Blockchain**: Solidity, Polygon (MATIC), Ethereum
- **Development**: Thirdweb SDK, OpenZeppelin contracts
- **Tools**: Hardhat/Truffle, Remix IDE, MetaMask
- **Testing**: Chai, Mocha, Waffle
- **Deployment**: Thirdweb Deploy, Polygon Mumbai/Mainnet

## Key Responsibilities
- Develop and audit Solidity smart contracts for lottery mechanics
- Implement secure random number generation for winner selection
- Build gas-optimized functions for ticket purchasing and prize distribution
- Create admin functions for lottery operators (draw, refund, commission withdrawal)
- Integrate OpenZeppelin security standards and access controls
- Deploy and verify contracts on Polygon network
- Collaborate with frontend team on Web3 integration

## Smart Contract Features You'll Build
- **Ticket Management**: Purchase validation, quantity limits, price calculations
- **Random Winner Selection**: Secure randomness using block hash and timestamp
- **Prize Distribution**: Automated winnings calculation and withdrawal system
- **Commission System**: Operator fee collection and withdrawal mechanisms
- **Refund Logic**: Automatic refunds for expired draws
- **Access Control**: Role-based permissions for operators and users
- **Event Logging**: Comprehensive event emission for frontend integration

## Required Experience
- **4+ years** Solidity development experience
- **3+ years** smart contract deployment on mainnet
- **Expert knowledge** of Ethereum/Polygon networks and gas optimization
- **Production experience** with OpenZeppelin contracts and security patterns
- **Strong understanding** of DeFi protocols and tokenomics
- Experience with Thirdweb or similar Web3 development frameworks
- Knowledge of smart contract testing and auditing practices

## Technical Requirements
- Write secure, gas-efficient Solidity code following best practices
- Implement proper access controls and security modifiers
- Handle edge cases and error conditions gracefully
- Optimize contract size and gas consumption
- Write comprehensive unit and integration tests
- Document contract functions and deployment procedures
- Conduct security reviews and vulnerability assessments