Design a real-time Inventory Management System
Last updated: June 1, 2026
Quick Overview
Design a real-time inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Waymo
June 1, 2026382
15
4,281 solved
Design a real-time inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Waymo's Onsite 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 document this for other engineers?
- 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 this inventory management system, the following core design principles apply:
- SOLID Principles: Adhering to the SOLID principles, especially the Single Responsibility Principle (SRP) ensur...
Architecture
The architecture for the real-time inventory management system will follow a microservices approach:
- Service-Oriented Architecture (SOA): We'll break down the system into several microservices...
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