When your web or mobile app experiences rapid traffic surges—such as flash sales, ticket drops, or viral marketing campaigns—synchronous HTTP calls to external APIs can exhaust web server worker threads. Building a high-throughput OTP pipeline requires non-blocking asynchronous architecture.
1. Redis Leaky-Bucket Rate Limiter Design
Before triggering an HTTP call to NepalOTP, pass requests through a Redis rate limiter grouped by IP address and target phone number. This prevents abusive scripts from consuming API credits.
2. Offloading SMS Jobs to Background Workers
In Laravel, implement the ShouldQueue interface on your OTP Notification class. In Node.js, push jobs to BullMQ or Redis Pub/Sub. Return an immediate HTTP 202 Accepted response to the user frontend while background queue workers dispatch the SMS asynchronously.