To design a simplified Robinhood-like stock trading platform, we need to consider core functionalities like user management and stock operations.
User Management would involve:
- User Creation: Storing user IDs, names, and initial cash balances.
- Balance Retrieval: Fetching a user's current cash balance.
- Deposits: Allowing users to add funds to their accounts.
- Withdrawals: Enabling users to remove funds, ensuring sufficient balance.
Stock Operations would include:
- Stock Price Updates: A mechanism to update the real-time price of specific stocks.
- Stock Price Retrieval: Fetching the current price of a given stock symbol.
- Order Placement: Handling buy and sell orders, including order types (market, limit), quantities, and associated prices.
- Order Execution: Matching buy and sell orders based on price and time priority, updating user portfolios and balances.
- Portfolio Management: Tracking a user's current stock holdings, including quantity and average purchase price.
System Design Considerations would involve:
- Database: Choosing a suitable database (e.g., SQL for transactional integrity, NoSQL for scalability) to store user data, stock information, and order history.
- APIs: Designing RESTful APIs for frontend interaction and inter-service communication.
- Scalability: Architecting the system to handle a large number of users and high trading volumes, potentially using microservices, load balancing, and caching.
- Reliability: Implementing fault tolerance and ensuring data consistency, especially during order execution.
- Real-time Updates: Utilizing technologies like WebSockets for pushing real-time stock price and order status updates to users.
- Security: Implementing robust security measures for user authentication, authorization, and transaction protection.
Uber