Design a Global Marketing Email Platform
Company: Bloomberg
Role: Software Engineer
Category: System Design
Difficulty: medium
Interview Round: Onsite
Design a marketing email system for a large consumer marketplace.
The business wants to run campaigns that may send 2-3 marketing emails within a 15-minute delivery window. The system must support users across multiple time zones and allow marketers to define campaigns, audiences, templates, and send schedules.
Key requirements:
- schedule delivery correctly for users in different time zones
- support A/B testing across different email variants
- track whether an email was accepted, delivered, bounced, opened, clicked, unsubscribed, and whether it led to a downstream conversion
- expose metrics so marketers can compare experiment performance and overall campaign effectiveness
- remain reliable even when email providers throttle requests or return transient failures
Describe the architecture, core data model, scheduling strategy, delivery pipeline, experimentation logic, and tracking and analytics flow.
Quick Answer: This question evaluates a candidate's ability to design a scalable, reliable distributed system for global marketing email delivery, encompassing time-zone-aware scheduling, high-throughput delivery, A/B experimentation, tracking, and analytics.