Gammastack - Backend Developer - Node.js/Express.js

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