Design a Inventory Management Service
Last updated: January 27, 2026
Quick Overview
Design a real-time inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
TikTok
January 27, 20260
11
1,680 solved
Design a real-time inventory management system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
TikTok asks this during the System Design Round 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
- How would you measure the performance of this component in production?
- How would you handle backward compatibility?
- What are the security implications of this design?
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Core Design Principles
For the Inventory Management Service at TikTok, the key design principles include:
- Single Responsibility Principle (SRP): Each microservice should handle one specific function, such as inventor...
Architecture
The architecture will be microservices-based to allow for independent scaling and deployment. Key components include:
- API Gateway: To manage all incoming requests and route them to appropriate s...
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