Decagon
Medium
Software EngineerDesign an AI Gateway
System Design
17
0
February 17, 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.
419Questions
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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Lyft
Hard
Software EngineerDesign a distributed web crawler
System Design
11
0
September 6, 2025
Rippling
Medium
Software EngineerDesign an ad-click aggregation and enrichment pipeline
System Design
13
0
October 17, 2025
Roblox
Hard
Software EngineerDesign resource loader and ROS-like pub/sub
System Design
14
0
September 6, 2025
OpenAI
Hard
Software EngineerDesign a URL shortening service
System Design
15
0
December 8, 2025
Snowflake
Hard
Software EngineerDesign cache for DAG-based query views
System Design
12
0
September 6, 2025
Instacart
Medium
Software EngineerDesign Asset Storage System
System Design
9
0
May 30, 2026
TikTok
Hard
Software EngineerDesign a high-concurrency ticketing system
System Design
9
0
September 6, 2025
DoorDash
Hard
Software EngineerDesign consistent hashing for sharding
System Design
12
0
September 6, 2025
Anthropic
Hard
Machine Learning EngineerDesign a Production ML Serving System
ML System Design
10
0
January 12, 2026
Meta
Hard
Machine Learning EngineerArchitect an asynchronous RL post-training system
ML System Design
13
1
September 6, 2025
Airbnb
Hard
Software EngineerDesign a multi-channel notification system
System Design
6
0
September 6, 2025
Decagon
Medium
Software EngineerDesign a Single-Domain Chatbot
ML System Design
10
0
March 9, 2026
Lambda
Hard
Software EngineerDesign a cloud AI inference platform
ML System Design
7
0
September 6, 2025
LinkedIn
Hard
Software EngineerDesign Top K ranking system
System Design
14
0
July 29, 2025
Roblox
Hard
Machine Learning EngineerDesign a real-time game recommendation system
ML System Design
7
0
July 16, 2025
Snowflake
Hard
Software EngineerDesign under vague distributed requirements
System Design
7
0
September 6, 2025
Current
Hard
Software EngineerDesign a metrics monitoring system
System Design
15
0
July 31, 2025
Lyft
Hard
Software EngineerDesign web crawler for 1000 devices
System Design
17
0
August 4, 2025
Citadel
Hard
Software EngineerDesign a low-latency trading platform
System Design
12
0
January 26, 2026
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.