Guest MemberLanguage   English
Software Architecture · System Design

How would you answer an interview scenario involving load balancing?

AdvancedUpdated 2026-08-09

For an interview scenario involving load balancing, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Load balancing distributes traffic across healthy service instances or endpoints. In this scenario, half the instances lose database connectivity while processes remain alive. Explain how traffic should be handled. For production, use meaningful readiness checks, connection draining, sensible algorithms, and multi-zone distribution. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.

#system-design#load-balancing