Design a large-scale Notification Platform
Last updated: May 14, 2026
Quick Overview
Design a distributed notification system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Mastercard
May 14, 202613
4
1,983 solved
Design a distributed notification system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Mastercard's Technical Screen tests whether you can reason about software design at a deep level. The interviewer expects discussion of maintainability, testability, and operational considerations.
What the Interviewer Expects
- Apply engineering principles to a realistic design scenario
- Discuss trade-offs between different approaches with concrete examples
- Demonstrate understanding of testability, maintainability, and extensibility
- Connect theoretical concepts to production engineering practices
- Discuss how the approach scales with team and codebase size
Key Topics to Cover
How to Approach This
- Apply SOLID principles. Single Responsibility makes code testable, Open/Closed makes it extensible.
- Choose data structures based on access patterns, not familiarity.
- Prefer immutable data and message passing over shared mutable state for concurrency.
- Design APIs with RESTful conventions, versioning, meaningful errors, and pagination from day one.
Possible Follow-up Questions
- How would you handle backward compatibility?
- What testing strategy would you use for this component?
- How would you measure the performance of this component in production?
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Core Design Principles
In designing a large-scale Notification Platform for Mastercard, the core design principles that apply include Separation of Concerns, Scalability, and Loose Coupling.
- **Separation of ...
Architecture
For the Notification Platform architecture, I propose a microservices-based architecture. The system will consist of the following services:
- Notification Service: This handles incoming no...
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