Job DescriptionWe’re looking for a Backend Developer who can take ownership of our backend systems and help us build, maintain, and scale reliable production applications. You’ll work across APIs, databases, real-time communication, payments, deployments, monitoring, and performance optimization. We’re looking for someone who is comfortable owning backend problems end-to-end rather than only working on isolated tickets. What You’ll Do Build, maintain, and optimize Node.js + Express backend services Design and develop scalable REST APIs Design and manage MongoDB / Mongoose schemas Build and maintain WebSocket / Socket.io based real-time features Integrate and maintain payment gateways such as Razorpay, Cashfree, PhonePe, or similar providers Build reliable transaction, wallet, ledger, and payout-related backend flows Work with Redis for caching, queues, and background processing Monitor production servers, logs, application health, and system performance Set up alerts and help respond to production incidents Identify performance bottlenecks and optimize APIs, databases,



and backend services Manage deployments and basic production infrastructure Improve backend reliability, scalability, security, and error handling Debug and resolve production issues independently Work closely with frontend and product teams to ship features end-to-end Must Have 1+ years of hands-on Node.js backend development experience Strong knowledge of Node.js and Express.js Solid understanding of MongoDB and Mongoose Good understanding of REST API design and backend architecture Hands-on experience with WebSockets / Socket.io Experience integrating payment gateways Understanding of authentication, authorization, validations, and API security Basic DevOps knowledge including deployments, server logs, restarts, and production debugging Strong debugging and problem-solving skills Ability to understand and work with an existing production codebase Good to Have Experience with Redis for caching or j

📌 Back End Developer (Uttar Pradesh)
🏢 ChatSpark
📍 Uttar Pradesh