Design a Notification Service
Strategy PatternFactory PatternTemplate Method PatternRate LimitingBatching
Design a notification service that can send messages to users through multiple channels (email, SMS, push notifications). The service should support rate limiting to prevent overwhelming users, batching to optimize resource usage, template management for consistent messaging, user preferences for channel selection, and retry mechanisms for failed notifications. The system must be scalable, reliable, and easily extensible to support new notification channels in the future.
What You'll Build
- The system must support sending notifications through multiple channels: email, SMS, and push notifications.
- Users must be able to set preferences for notification channels, opt-in/opt-out of specific notification types, and configure frequency limits.
- The system must implement rate limiting to prevent sending too many notifications to the same user within a configurable time window (e.g., max 10 notifications per hour per user per channel).
- The system must support batching multiple notifications together for efficient delivery, with configurable batch size limits and time windows.
- The system must provide template management functionality, allowing creation, retrieval, and updating of notification templates with support for dynamic placeholders.
- ...and more
🎯
Step-by-Step Guidance
Follow our systematic 8-step approach to design the system from scratch. Learn how to identify actors, assign responsibilities, and create class diagrams.
📊
Interactive UML Builder
Build class diagrams visually with our drag-and-drop UML editor. Connect classes, define relationships, and see your design come to life.
💻
Multi-Language Support
Practice in Python, Java, C++, TypeScript, JavaScript, or C#. Get complete solutions and explanations in all supported languages.
🤖
AI-Powered Review
Get instant feedback on your design and code. Our AI reviews your implementation and suggests improvements based on best practices.
📚
Design Patterns
Learn how to apply design patterns like Strategy Pattern, Factory Pattern and more. Understand when and why to use each pattern.
✅
Complete Solutions
Access detailed solutions with explanations, UML diagrams, and code implementations. Learn from industry best practices.
🐍 Python ☕ Java 📘 TypeScript 🟨 JavaScript ⚡ C++ 🟣 C#
Ready to Master This Problem?
Join thousands of developers practicing Low Level Design. Build your design step-by-step, get AI feedback, and learn from complete solutions.
🚀 Start Practicing Now