Design a event-driven Notification System
Last updated: May 23, 2026
Quick Overview
Design a event-driven notification system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
Walmart
ML System Design
Machine Learning Engineer
Walmart
May 23, 2026Machine Learning Engineer
Onsite
ML System Design
Easy
578
10
4,813 solved
Design a event-driven notification system handling millions of requests. Discuss consistency, availability, and performance trade-offs.
How to Approach This
- Start by mapping the business objective to a concrete ML objective and metric.
- Cover the full pipeline: data collection, feature engineering, model selection, training, serving.
- Discuss online vs offline evaluation. Plan an A/B test to validate real-world impact.
- Address the serving latency budget and whether batch or real-time inference is needed.
- Think about the data flywheel: how user feedback improves the model over time.
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Practice ML System Design ProblemsSample Answer
Problem Formulation
The goal is to design an event-driven notification system for Walmart that can efficiently handle millions of requests for sending notifications (e.g., promotions, order updates, alerts). This maps to...
Data & Features
The system will require various data sources:
- User Data: Profiles including demographics, past interactions, preferences, and purchase history.
- Event Data: Timestamped logs of user actio...
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