Design a Load Balancing for Workday
Last updated: October 2, 2025
Quick Overview
Design a real-time load balancing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Workday
October 2, 2025266
3
745 solved
Design a real-time load balancing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Workday'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 this design change if the team size doubled?
- What testing strategy would you use for this component?
- How would you handle backward compatibility?
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Core Design Principles
For the load balancing system at Workday, the core design principles include:
- Separation of Concerns: This principle ensures that load balancing is decoupled from the application logic. By mai...
Architecture
The proposed architecture for the load balancing system is a microservices-based model, utilizing a combination of:
- Reverse Proxy Load Balancer: A reverse proxy (e.g., Nginx or HAProxy) will d...
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