Salesforce
Hard
Software EngineerDesign an async job system and cache layer
System Design
11
0
January 22, 2026
Load Balancing Interview Questions
Load balancing questions test your understanding of how to distribute traffic across multiple servers effectively.
Expect discussions on algorithms (round-robin, least connections, consistent hashing), health checks, and failover strategies.
Interviewers evaluate whether you understand when and why to use different load balancing approaches.
420Questions
112Companies
Easy 21 • Medium 158 • Hard 236Difficulty mix
Common load balancing interview patterns
- Round-robin vs least-connections vs consistent hashing
- Layer 4 (TCP) vs Layer 7 (HTTP) load balancing
- Health checks and automatic failover
- Session affinity and sticky sessions
- Global server load balancing (GSLB) for multi-region
- Load balancer as a single point of failure and redundancy
Load balancing interview questions
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Snowflake
Hard
Software EngineerDesign resilient auth with flaky third-party tokens
System Design
11
0
September 6, 2025
Google
Hard
Machine Learning EngineerDesign a real-time recommendation system
ML System Design
11
0
December 8, 2025
OpenAI
Hard
Software EngineerDesign a multi-tenant Slack-like messenger
System Design
6
0
September 6, 2025
Uber
Medium
Software EngineerDesign A URL Shortener
System Design
13
0
May 4, 2026
HubSpot
Easy
Software EngineerDesign a Netflix-like video platform
System Design
7
0
December 15, 2025
Pinterest
Medium
Software EngineerDesign autocomplete and merchant bulk edits
System Design
10
0
November 11, 2025
Meta
Hard
Machine Learning EngineerDesign a scalable MoE pretraining pipeline
ML System Design
13
0
September 6, 2025
Amazon
Hard
Software EngineerDesign a High-Availability Load Balancer
System Design
11
0
May 9, 2026
OpenAI
Medium
Software EngineerDesign Slack-like multi-tenant global messaging system
System Design
13
0
December 1, 2025
OpenAI
Hard
Machine Learning EngineerDesign an in-memory database
System Design
14
0
July 15, 2025
Google
Medium
Software EngineerDesign a large-scale distributed rate limiter
System Design
9
0
January 12, 2026
LinkedIn
Medium
Software EngineerDesign a scalable key-value store
System Design
12
0
December 8, 2025
Perplexity AI
Hard
Software EngineerImplement resilient LLM provider pool
ML System Design
6
0
August 13, 2025
OpenAI
Medium
Software EngineerDesign a payment system
System Design
7
0
January 9, 2026
Whatnot
Medium
Software EngineerDesign a Charity Donation Website
System Design
12
0
May 30, 2026
HubSpot
Hard
Software EngineerDesign a streaming video platform MVP (Netflix-like)
System Design
7
0
September 6, 2025
OpenAI
Hard
Machine Learning EngineerDesign enterprise RAG search system
ML System Design
7
0
August 4, 2025
J.P. Morgan
Easy
Software EngineerDesign a URL shortener
System Design
13
0
March 10, 2026
Lyft
Hard
Software EngineerDesign a scalable real-time chat system
System Design
9
0
September 6, 2025
Common mistakes with load balancing
- Forgetting that the load balancer itself can be a bottleneck
- Using sticky sessions when stateless design is possible
- Not considering health check latency and false positives
- Ignoring the difference between L4 and L7 load balancing
How load balancing questions are evaluated
Demonstrate understanding of trade-offs between different algorithms.
Explain how the system handles server failures gracefully.
Consider the load balancer in the context of the overall system architecture.