Design a Task Scheduling for Scale AI
Last updated: November 24, 2025
Quick Overview
Design a fault-tolerant task scheduling system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Scale AI
November 24, 202560
7
2,090 solved
Design a fault-tolerant task scheduling system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Scale AI typically last 45-60 minutes. You are expected to drive the conversation, starting from requirements gathering through to a detailed architecture. The interviewer will evaluate your ability to handle ambiguity and make practical engineering decisions.
What the Interviewer Expects
- Clearly define functional and non-functional requirements
- Propose a reasonable high-level architecture with core components
- Choose appropriate data storage solutions with basic justification
- Discuss basic scaling strategies (horizontal scaling, caching)
- Identify potential bottlenecks and suggest simple solutions
Key Topics to Cover
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you implement rate limiting to protect the system?
- What happens if one of your database nodes goes down?
- What monitoring and alerting would you set up on day one?
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Requirements
Functional Requirements:
- Task Submission: Users can submit tasks to the scheduler via a REST API.
- Task Execution: The system should execute tasks asynchronously in a fault-tolerant m...
Capacity Estimation
Assuming Scale AI handles approximately 10 million task submissions per day:
- Requests per Second:
- **Peak...
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