Build a distributed Notification Pipeline
Last updated: March 25, 2026
Quick Overview
Design a distributed notification system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
CrowdStrike
March 25, 202654
6
2,695 solved
Design a distributed notification system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
CrowdStrike asks this during the System Design Round to assess your architectural thinking. They want to see how you decompose a complex problem, choose appropriate technologies, and reason about failure modes. Strong candidates proactively discuss monitoring, alerting, and operational concerns.
What the Interviewer Expects
- Systematically gather requirements and estimate capacity (QPS, storage, bandwidth)
- Design a scalable architecture with clear component responsibilities
- Make well-reasoned database and caching decisions with trade-off analysis
- Address consistency vs availability trade-offs specific to the use case
- Discuss partitioning strategy, replication, and data modeling
- Cover failure handling, monitoring, and alerting strategies
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 optimize costs as the system scales?
- How would you handle a 10x increase in traffic overnight?
- How do you ensure data consistency across multiple services?
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Requirements
Functional Requirements
- Notification Types: The system must support multiple notification types (e.g., alerts, updates, reminders).
- Delivery Channels: Notifications should be sent vi...
Capacity Estimation
To estimate capacity, assume:
- User Base: 10 million active users.
- Notification Frequency: Each user receives an average of 5 notifications per day.
- Peak Load: During peak times, traf...
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