OpenAI

Implement a spreadsheet system with cell dependencies.

Classes:

class Cell {
    Integer value;
    String child1;
    String child2;
}

class Spreadsheet {
    int getCellValue(String key)
    void setCell(String key, Cell cell)
}

Requirements:

1. Handle cell dependencies
2. Implement DFS traversal
3. Cache optimization
4. Parent-child relationship tracking

Implement a priority-based data structure.

Required Methods:

addKey(key: string): void
getCountForKey(key: string): number

Implementation Details:

1. Max heap maintenance
2. Priority tracking
3. Efficient updates
4. Consistency management

Similar to LRU cache implementation but with priority handling.

Comprehensive interview experience for OpenAI's Applied AI position (ChatGPT Backend).

Virtual Onsite Structure (5 Rounds):

1. Coding Round

Focus: Coroutine/Generator/Iterator Implementation
Questions:
- Implement next(), get_state(), set_state() functions
- Write comprehensive unit tests
- Implement list iterator class
- Design JSON file iterator interface

Key Challenges:
- State resumability
- Comprehensive test coverage
- StopIteration handling
- Multiple iterator management

2. System Design Round

Task: Design FourSquare's POI Feature
Approaches Discussed:
- Geohash implementation
- Quadtree solution
Note: High attention to detail expected

3. Hiring Manager Round Topics Covered:

• Career transition motivation
• Interest in OpenAI
• Challenge handling
• Feedback experiences
• Failure scenarios
• Future considerations

4. Cross-Functional (XFN) Round Key Questions:

• PM collaboration example
• XFN priority management
• Stakeholder communication

5. Project Deep Dive Framework:

• Technical story structure (Why/What/How)
• STAR method application
• Learning outcomes
• Technical implementation details

Interview Tips:

• Practice concise responses
• Prepare comprehensive test cases
• Focus on leadership qualities
• Drive the conversation
• Demonstrate technical depth
• Show cross-functional excellence

Key Takeaways:

• Strong performance needed in all rounds
• Detailed technical knowledge required
• Leadership qualities emphasized
• Interview driving ability important
• High bar for success