Notification System

Notification System designs and implements comprehensive multi-channel notification infrastructure. It covers the full notification lifecycle from event triggering through channel routing, template rendering, delivery, and tracking — with proper user preference management and rate limiting.

How It Works

1. Event definition — Defines notification triggers as typed events with payload schemas
2. Channel routing — Routes events to appropriate channels (push, email, SMS, in-app) based on user preferences and event priority
3. Template system — Creates channel-specific templates with variable interpolation and localization support
4. Delivery pipeline — Implements queued delivery with retry logic, exponential backoff, and dead letter handling
5. Preference management — Generates user preference APIs with granular channel and category controls

Best For

• SaaS products building their first notification infrastructure
• Teams migrating from ad-hoc notification sending to a unified system
• Mobile apps implementing push notification strategies
• E-commerce platforms with complex transactional notification needs

Anti-Spam Design

Includes notification frequency capping, smart batching (digest mode), quiet hours enforcement, and duplicate suppression. Prevents notification fatigue while ensuring critical alerts always get through.