Design a large-scale Email Platform
Last updated: March 23, 2026
Quick Overview
Design a high-throughput email system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Oracle
March 23, 20261
11
2,794 solved
Design a high-throughput email system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Oracle 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 do you ensure data consistency across multiple services?
- What happens if one of your database nodes goes down?
- How would you optimize costs as the system scales?
- How would you implement rate limiting to protect the system?
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Requirements & Capacity Estimation
## Functional Requirements - Send emails with attachments to millions of recipients - Support email delivery at scale (millions of emails/day) - Track...
High-Level Architecture
## System Components ``` ┌─────────────────┐ │ Client APIs │ (REST/gRPC - Oracle Cloud) └────────┬────────┘ │ ┌────────▼────────────────...
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