Design a real-time Image Processing System
Last updated: December 16, 2025
Quick Overview
Design a real-time image processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
PlanetScale
December 16, 202548
4
3,610 solved
Design a real-time image processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
PlanetScale asks this during the Onsite to assess your depth in software engineering. They want to see understanding of design patterns, system architecture, and the trade-offs involved in different technical approaches.
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
- What are the security implications of this design?
- How would this design change if the team size doubled?
- How would you measure the performance of this component in production?
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Core Design Principles
For the real-time image processing system, the following core design principles are applicable:
- Separation of Concerns: This principle allows us to break down the system into distinct componen...
Architecture
The architecture for the real-time image processing system at PlanetScale would be microservices-based, with the following components:
- API Gateway: Acts as a single entry point for all client ...
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