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INDEPENDENT PROJECT · BACKEND & DEVOPS

Choolha Chowka — meal subscriptions and payment recovery

Owned backend and DevOps for meal plans, OTP access, subscription changes, and signed Razorpay webhook recovery.

Himanshu SharmaCase study updated

The product

Choolha Chowka is a meal-subscription platform covering account access, carts, plan durations, leave handling, payments, and subscription changes.

My ownership

I owned the backend and DevOps work, collaborating with Abhimanyu Singh on the frontend. The backend uses Django REST Framework, PostgreSQL, Redis, Celery, Razorpay, and Docker.

A payment is more than a browser callback

Browser confirmation can fail after a payment succeeds. I implemented HMAC-verified Razorpay webhooks to reconcile payment state and activate subscriptions independently of that browser response. The handling includes repeat-payment checks and isolates notification failures so an email error does not undo the subscription flow.

Other workflows I built

  • Multi-role OTP authentication and Redis OTP caching.
  • Multi-plan carts, configurable durations, leave handling, and subscription-day changes.
  • Celery jobs for expiry and email processing, including retry behavior.
  • Docker deployment support for the backend and supporting services.
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