GammaStack - Web3.js Developer

Job Description

Description Lead and own backend development using Node.js and Express.js Design, build, and maintain scalable RESTful APIs and microservices architecture Write, debug, and optimize complex raw SQL queries for performance and scalability Work with PostgreSQL and Sequelize ORM for data modeling and management Implement caching solutions using Redis & Integrate real-time features using Socket.io Develop and integrate smart contracts (Solidity / Rust) Work with blockchain protocols (Ethereum, Polygon, BNB Chain, Solana, etc.) to enable smooth crypto transactions Design and implement wallet integrations (MetaMask, WalletConnect, custom/custodian wallets) Integrate Web3.js / Ethers.js or similar blockchain libraries into the backend Required Skills 3-5 years of experience as a Backend Developer with at least 2-3 years with blockchain projects Expertise in raw SQL queries, indexing, joins, query tuning, and optimization Strong proficiency in PostgreSQL and Sequelize ORM Hands-on experience with Docker, Redis, and Socket.io Familiarity with AWS cloud services (EC2, S3, RDS) Strong understanding of backend performance optimization techniques Proven leadership or mentoring experience in engineering teams Strong proficiency in Solidity (Rust is a plus) Experience with Web3.js / Ethers.js or similar blockchain libraries Experience with multiple blockchain protocols (Ethereum, Polygon, BNB Chain, Solana, etc.) Knowledge of wallet integrations (MetaMask, WalletConnect, custom/custodian wallets) Must-Have Skills Node.js & Express.js backend development PostgreSQL (raw SQL, Sequelize ORM) Redis caching & Socket.io real-time features Solidity smart contracts & major blockchain protocols (Ethereum, Polygon, BNB, Solana) Web3.js / Ethers.js & wallet integrations (MetaMask, WalletConnect) Docker & basic AWS deployment skills Backend performance optimization & team leadership (ref:hirist.tech)