About This Role
Building, maintaining, and scaling the company's production backend systems is the core of this role, which involves real-time communication, digital transactions, wallet systems, and subscription-based payments. This position suits a developer with strong backend fundamentals and hands-on experience in payment gateway integrations and transaction management, who can independently own and solve critical backend challenges on live production systems.
Responsibilities
- Build, maintain, and optimize Node.js and Express.js backend services
- Develop scalable REST APIs and manage MongoDB/Mongoose databases
- Maintain WebSocket/Socket.io real-time communication
- Work with Redis for caching, queues, and background processing
- Optimize database queries, API performance, and backend scalability
- Integrate and manage payment gateways including Juspay, Cashfree, Razorpay, PhonePe, or similar providers
- Build and maintain UPI AutoPay and recurring subscription flows
- Handle mandate registration, activation, recurring debits, renewals, cancellations, and failures
- Implement secure payment webhooks and server-to-server payment verification
- Manage payment status synchronization, transaction reconciliation, and settlement-related workflows
- Handle failed payments, retries, duplicate transactions, and subscription lifecycle events
- Build reliable wallet, ledger, and transaction management systems
- Debug payment gateway issues and coordinate with payment provider technical teams
- Independently manage backend deployments and production issues
- Monitor server performance, logs, APIs, and application health
- Debug and resolve critical production issues
- Improve application reliability, security, and error handling
- Work with AWS/GCP or similar infrastructure
- Take ownership of existing production codebases and improve system stability
Requirements
- 2+ years of hands-on Node.js and Express.js development experience
- Strong understanding of MongoDB, Mongoose, REST APIs, and backend architecture
- Practical experience integrating payment gateways and handling production transactions
- Experience with recurring subscriptions, UPI AutoPay, mandates, or similar automated billing systems
- Strong knowledge of webhooks, payment verification, asynchronous processing, and idempotency
- Experience with Redis and WebSockets/Socket.io
- Understanding of authentication, authorization, and API security
- Ability to independently debug production issues
- Comfortable working with existing production codebases
Nice to have:
- Direct experience with Juspay, Cashfree, or Razorpay subscriptions
- Experience with UPI mandates and recurring billing
- Knowledge of payment reconciliation, refunds, settlements, and ledger systems
- Experience with Docker, CI/CD, AWS, or GCP
- Experience with high-concurrency or real-time applications
- Familiarity with background jobs, message queues, and load testing
