About the job

We're looking for a strong Backend Developer who can independently own, maintain, and scale our production backend systems. Our applications handle real-time communication, digital transactions, wallet systems, and subscription-based payments.

We need someone with strong backend fundamentals and hands-on experience in payment gateway integrations, recurring subscriptions, UPI AutoPay, webhooks, and transaction management.

This is an ownership-driven role where you'll work directly on live production systems and solve critical backend challenges.

What You'll Do

Backend Development & Architecture

- 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.

Payments & Subscription Management (Critical)

- 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.

Production & Infrastructure

- 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.

Must Have

- 2 years of hands-on Node.js and Express.js development experience.
- Robust 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.

Good 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.

Pay: ₹20,000.00 - ₹40,000.00 per month

Application Question(s)

- How many years of work experience do you have with Node.js?
- Have you independently integrated payment gateways like Cashfree, Juspay, Razorpay, or PhonePe in a production application?
- Do you have hands-on experience implementing recurring subscriptions, UPI AutoPay, or payment mandates?
- Have you implemented payment webhooks, server-to-server verification, and duplicate transaction prevention?
- How many years of hands-on experience do you have with MongoDB and Mongoose?
- Have you worked with Redis and WebSockets/Socket.io in production applications?
- Have you handled subscription renewals, failed payments, retries, and payment reconciliation?

Work Location: Remote

📌 Backend Developer (India)
🏢 ChatSpark
📍 India