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Scaling • Architecture Decisions

ADR 002: Celery & Redis Scheduler

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ADR 002: Celery & Redis Scheduler

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ADR-002: Celery & Redis Broadcast Scheduler Engine

Status: Accepted
Date: 2026-07-05
Deciders: Backend Engineering Team

Context

Mass broadcast marketing campaigns send thousands of WhatsApp messages per campaign. Executing API calls synchronously during HTTP requests blocks web workers and risks timing out.

Decision

We adopt Celery 5.3 backed by Redis as our distributed task processing engine. Periodic cron scheduling is handled via

django_celery_beat

Consequences

Positive: High throughput, scalable worker nodes, automatic retries with exponential backoff.
Negative: Requires running Redis and Celery worker processes alongside the web server.