GammaStack - Blockchain Developer - Backend System

12 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 backendRequired 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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