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

20 hours ago

Bengaluru, India Gammastack Full time

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)

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