Design a Load Balancing Service
Last updated: September 22, 2025
Quick Overview
Design a event-driven load balancing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Discord
September 22, 2025290
6
281 solved
Design a event-driven load balancing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Software engineering fundamentals questions at Discord test your understanding of core CS concepts and their practical application. This Onsite question evaluates how you apply engineering principles to build maintainable, scalable software.
What the Interviewer Expects
- Explain the concept clearly with a practical example
- Discuss when and why to apply this principle
- Identify common mistakes and anti-patterns
- Compare with alternative approaches
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 document this for other engineers?
- What are the security implications of this design?
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Core Design Principles
For the load balancing service at Discord, the following core design principles apply:
- Separation of Concerns: This principle ensures that different components of the load balancing service ha...
Architecture
The proposed architecture for the load balancing service includes:
- API Gateway: An API Gateway that serves as the entry point for all client requests. It can route requests to the appropriate ...
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