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Design a Follower Push Notification System
Design a robust and scalable notification system for a social product.
Core Functionality
- When a user publishes a new post, the system must send push notifications to all of that user's followers.
- The primary delivery channel for these notifications is mobile push (e.g., Apple Push Notification service (APNs) and Firebase Cloud Messaging (FCM)).
- The design should consider extensibility to support other notification channels in the future.
Key Areas to Cover
Your design should address the following aspects:
- Core Requirements and Non-Functional Goals: Define the essential functional requirements and critical non-functional attributes such as latency, reliability, and scalability targets.
- High-Level Architecture: Outline the main components of the system and their interactions.
- Large Fan-Out Handling: Detail strategies for efficiently delivering notifications to users with a very large number of followers.
- Data Model and Storage: Propose data models and appropriate storage choices for the follower graph and notification records.
- Advanced Features: Include mechanisms for rate limiting, managing user preferences (e.g., opt-out, quiet hours), deduplication of notifications, and retry logic for failed deliveries.
- Operational Aspects: Describe how observability (monitoring, logging, alerting) and comprehensive failure handling will be incorporated into the system.
AI interview prep
Core dilemma
Balancing the need for real-time, high-volume notification delivery with the inherent challenges of large fan-out, external service dependencies, and strict reliability/latency requirements, while managing cost and operational complexity.
Mid-level signals3
Senior signals3
Red flags4
3 tradeoffs and 3 stress tests locked
Interview prep
Unlock the interviewer X-Ray rubric, tradeoff matrix, stress tests, clarifying questions, and key concepts.
Design a Follower Push Notification System
Design a robust and scalable notification system for a social product.
Core Functionality
- When a user publishes a new post, the system must send push notifications to all of that user's followers.
- The primary delivery channel for these notifications is mobile push (e.g., Apple Push Notification service (APNs) and Firebase Cloud Messaging (FCM)).
- The design should consider extensibility to support other notification channels in the future.
Key Areas to Cover
Your design should address the following aspects:
- Core Requirements and Non-Functional Goals: Define the essential functional requirements and critical non-functional attributes such as latency, reliability, and scalability targets.
- High-Level Architecture: Outline the main components of the system and their interactions.
- Large Fan-Out Handling: Detail strategies for efficiently delivering notifications to users with a very large number of followers.
- Data Model and Storage: Propose data models and appropriate storage choices for the follower graph and notification records.
- Advanced Features: Include mechanisms for rate limiting, managing user preferences (e.g., opt-out, quiet hours), deduplication of notifications, and retry logic for failed deliveries.
- Operational Aspects: Describe how observability (monitoring, logging, alerting) and comprehensive failure handling will be incorporated into the system.