Build a real-time Order Processing Pipeline
Last updated: November 23, 2025
Quick Overview
Design a real-time order processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Booking.com
November 23, 202536
5
2,188 solved
Design a real-time order processing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Booking.com 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
- What testing strategy would you use for this component?
- How would this design change if the team size doubled?
- How would you handle backward compatibility?
- What are the security implications of this design?
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Core Design Principles
For the real-time order processing system at Booking.com, the core design principles that apply are:
- Separation of Concerns: This principle ensures that different components of the system hand...
Architecture
The architecture for the order processing pipeline can be structured as follows:
- Microservices: Implement a microservices architecture with distinct services for order ingestion, processing, a...
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