# Engineering projects

- [Webhook Delivery Platform](https://www.pradhumn.com/projects/webhook-platform/index.md): A webhook platform built around an uncomfortable reality: a receiver can accept an event just before the sender crashes. Designed for durable admission, bounded retries, and recoverable delivery.
- [Inventory Reservation System](https://www.pradhumn.com/projects/inventory-system/index.md): An inventory and order API that keeps stock correct when buyers compete, clients retry, and reservation expiry races with checkout. Domain rules, lock ordering, and an auditable ledger work together.
- [Paytm Payment System](https://www.pradhumn.com/projects/payment-system/index.md): A full-stack wallet for account creation, balance management, recipient discovery, and peer-to-peer transfers, with consistency at the center of money movement.