Senior Frontend Backend Web3 Engineer

Tags: NestJS, Solidity, Rust, PostgreSQL, React About Aetium Aetium is a climate-tech company and We are building the future of sustainable mobility platform called "EcoWheel". 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 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 the CO₂ Token Layer. Write clean, maintainable, and well-tested code. Collaborate with designers and other engineers. Requirements 5+ 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. Nice to Have 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 Google Maps API Docker GitHub What We Offer Fully remote Flexible working hours 20–30 hours per week Long-term collaboration Competitive hourly rate based on experience How to Apply If you're interested in joining the EcoWheel team, we'd love to hear from you. Please send the following to [email protected] : Your resume (CV) GitHub profile Portfolio or LinkedIn profile (optional) Frontend Engineer (React) Build modern, responsive web applications for the EcoWheel platform. You'll develop user-facing features including the rider dashboard, host dashboard, booking system, real-time maps, and fleet management while working closely with designers and backend engineers. Tech Stack: React, TypeScript, HTML, CSS, Google Maps API Hourly Rate: USD $70–$100/hour Backend Engineer (NestJS, NodeJs) Design and develop scalable backend services and REST APIs that power the EcoWheel platform. You'll build booking, authentication, fleet management, payment, and carbon tracking services while ensuring performance, security, and reliability. Tech Stack: NestJS, Node.js, PostgreSQL, REST APIs, Swagger/OpenAPI Hourly Rate: USD $70–$100/hour Web3 Engineer (Solidity, Rust) Develop and integrate blockchain solutions for EcoWheel's CO₂ Token Layer. You'll build smart contracts, implement wallet integrations, support tokenization, and connect blockchain functionality with the platform. Tech Stack: Solidity, OpenZeppelin, ERC-20/ERC-721/ERC-1155, Ethers.js or Viem, MetaMask, WalletConnect, Polygon, Arbitrum Hourly Rate: USD $90–$120/hour Engineering Lead Lead the technical direction of the EcoWheel platform and mentor the engineering team. You'll drive architecture decisions, review code, solve complex technical challenges, and collaborate with product and design teams to deliver scalable, high-quality software. Tech Stack: React, NestJS, PostgreSQL, Solidity, Cloud Infrastructure, System Architecture, Web3 Technologies Hourly Rate: USD $110–$140/hour