Design Craigslist

Functional Requirements:

• Users can register and log in to the platform.
• Users can create, edit, and delete classified ads (listings) with details such as title, description, category, price, location, and images.
• Users can browse and search for ads using filters like category, location, and keywords.
• Users can contact ad posters via an internal messaging system.
• Users can view their own posted ads and manage them.

Non-Functional Requirements:

• The system should be available and responsive for a large number of concurrent users (high availability, low latency).
• User data and communications must be securely stored and transmitted (security, privacy).
• The platform should be able to scale horizontally as traffic and data volume grow (scalability).
• The UI should be simple and easy to use (usability).
• The system should be able to recover from failures with minimal data loss (reliability).