Design a Hosted Notebook Platform
Company: OpenAI
Role: Software Engineer
Category: System Design
Difficulty: medium
Interview Round: Technical Screen
Design a hosted notebook platform for interactive code execution, similar to a cloud-based notebook service.
The system must support **500,000 concurrent users**. Each user can manage an isolated workspace with the following operations:
- Create a workspace
- Delete a workspace
- Suspend a workspace
- Resume a suspended workspace
A workspace includes the user's runtime environment and persisted notebook files. The **resume operation should complete in under 5 seconds** for typical requests.
Discuss:
- The high-level architecture
- Control plane and runtime execution design
- How workspace lifecycle management works
- How to meet the resume latency requirement
- Scalability strategies for 500,000 concurrent users
- Major failure modes and how the system should handle them
Quick Answer: This question evaluates understanding of large-scale, multi-tenant distributed system design including resource orchestration, workspace lifecycle management, low-latency resume guarantees, persistent storage considerations, and fault tolerance.