Build a fault-tolerant Task Scheduling Pipeline
Last updated: March 7, 2026
Quick Overview
Design a fault-tolerant task scheduling system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Slack
March 7, 202644
15
4,129 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 Slack 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
- Drive the design discussion proactively with minimal interviewer guidance
- Perform detailed capacity estimation and use it to inform design decisions
- Design for global scale with multi-region deployment and data consistency
- Deep dive into 2-3 critical components with implementation-level detail
- Address complex trade-offs: CAP theorem, eventual consistency, conflict resolution
- Discuss operational excellence: deployment strategy, chaos engineering, SLOs/SLIs
- Propose a phased rollout plan from MVP to full-scale system
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
- What happens if one of your database nodes goes down?
- What would the deployment pipeline look like for this system?
- How would you optimize costs as the system scales?
- How would you handle a region-wide outage?
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Requirements
Functional Requirements:
- Task Scheduling: Users should be able to create, update, and delete tasks.
- Concurrency Management: The system should allow multiple tasks to be scheduled at ...
Capacity Estimation
Assuming Slack has approximately 10 million active users, if we estimate that 20% of users schedule tasks daily, that leads to:
- Daily Task Requests: 10M * 20% = 2M tasks.
- Peak Load: Assume...
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