Crowdfunding platform

Seeking an experienced smart contract developer to build a secure, gas-efficient crowdfunding platform on Ethereum-compatible networks. Responsibilities include designing audited Solidity contracts for campaign creation, contribution handling, milestone-based fund releases, refunds, role-based access, and upgradeability patterns. Implement rigorous unit and integration tests, CI pipeline, and thorough documentation. Must follow best security practices, optimize for gas, and deliver clean, maintainable code.