TL;DR: We'll build a production-grade producer-consumer queue in Haskell using Redis as the message broker via the Hedis client library. By the end, you'll have a working system that can handle high-throughput job dispatch and consumption — the same pattern I used to process 1M+ payment refunds at Juspay.

Why Redis for a Queue?

When people think "message queue," they reach for Kafka or RabbitMQ. But Redis is often the right call when you need:

Low latency — sub-millisecond enqueue/dequeue

Simplicity — no broker clusters to manage

Atomicity — LPUSH / BRPOP are atomic operations, safe under concurrency

Visibility — you can inspect the queue state instantly with LLEN

At Juspay, we routed payment refunds through a Redis-backed producer-consumer system.…