Coinbase

Build a task management system UI incrementally with React. The system should be built level by level:

Level 1: Display Tasks

• Render list of tasks from JSON file
• Show tasks in backlog view
• Clean, responsive UI

Level 2: Task Creation

• Implement form to add new tasks
• Form validation
• Immediate UI update on task creation

Level 3: API Integration

// Primary API returns task IDs
interface TaskId {
  id: string;
}

// Secondary API returns task details
interface Task {
  id: string;
  title: string;
  description: string;
  status: string;
}

Requirements:

• Fetch task IDs from primary API
• Get task details from secondary API
• Handle loading states
• Error handling
• Similar to job board implementation

Level 4: Priority Management

• Add/remove task priorities
• Visual priority indicators
• Priority-based sorting

Technical Requirements:

• React components
• State management
• API integration
• Error handling
• Responsive design

Implement an algorithm to find the maximum conversion value between cryptocurrencies using bid/ask prices.

Example Input:

{
  "BTC-USD": {"ask": 1000, "bid": 990},
  "USD-ETH": {"ask": 10, "bid": 8},
  "ETH-BNB": {"ask": 1000, "bid": 990}
}

Requirements:

1. Find best conversion path between currencies
2. Handle cycles in conversion paths
3. Track and output the optimal path
4. Parse real-time data from API

Follow-up:

• Handle API rate limiting
• Implement exponential backoff
• Consider concurrent API requests

Design a global credit card approval system that can handle applications for multiple banks.

Key Requirements:

1. Application Processing

• Accept user applications
• Validate application data
• Handle global scale
• Ensure idempotency

2. Risk Assessment

• Integration with credit bureaus
• Fraud detection
• Rate limiting for abuse prevention

3. System Design Considerations

• Caching strategy
• Scalability approach
• Third-party integrations
• Asynchronous processing

4. Security

• Data encryption
• Access control
• Audit logging

Common behavioral questions at Coinbase:

1. Project Experience

• Describe your most challenging project
• How do you handle technical disagreements
• Experience with cross-team collaboration

2. Problem Solving

• Approach to prioritizing tasks
• Handling technical debt
• Decision-making process

3. Leadership & Growth

• Team leadership experience
• Mentoring and knowledge sharing
• Career development goals

4. Cultural Fit

• Interest in cryptocurrency/blockchain
• Adaptability to rapid change
• Remote work effectiveness