About EcoWheel EcoWheel is a climate-tech platform building the future of sustainable mobility. We help reduce carbon emissions through an e-bike rental platform powered by blockchain and AI. Our platform includes: E-bike rental marketplace Fleet management Real-time e-bike tracking CO₂ Token Layer Carbon marketplace AI-powered features About the Role We are looking for a Senior Full Stack Engineer with experience in React, NestJS, and Solidity to help build and improve the EcoWheel platform. You will work on both the frontend and backend, develop smart contracts, and build scalable features for our climate-tech platform. Responsibilities Develop web applications using React and TypeScript. Build REST APIs with NestJS. Design and maintain PostgreSQL databases. Develop Solidity smart contracts. Integrate blockchain features and wallet authentication. Build real-time e-bike tracking. Integrate Google Maps. Build the CO₂ Token Layer. Write clean, maintainable, and well-tested code. Collaborate with designers and other engineers. Requirements 3+ years of software development experience. Strong React and TypeScript skills. Strong NestJS and Node.js experience. Experience with PostgreSQL. Experience developing Solidity smart contracts. Knowledge of Ethereum or Arbitrum. Experience with Git and GitHub. Good communication and problem-solving skills. Nice to Have Google Maps API Docker CI/CD MetaMask or WalletConnect Ethers.js or Viem OpenZeppelin Hardhat or Foundry AI integrations Marketplace or SaaS experience Technology Stack React TypeScript NestJS Node.js PostgreSQL Solidity Ethereum Arbitrum ERC-20 / ERC-721 / ERC-1155 Ethers.js or Viem What We Offer Fully remote Flexible working hours 20–30 hours per week Long-term collaboration Competitive hourly rate based on experience If you're passionate about blockchain infrastructure, NFTs, tokenized environmental assets, and building scalable Web3 applications, we'd love to hear from you.