Nextdoor
Hard
Software EngineerDescribe CAP, distributed systems, multithreading experience
System Design
4
0
September 6, 2025
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.
395Questions
100Companies
Easy 17 • Medium 133 • Hard 242Difficulty 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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DoorDash
Hard
Software EngineerDesign an async donation payment platform
System Design
5
0
September 6, 2025
OpenAI
Hard
Machine Learning EngineerDesign an ML search system
ML System Design
3
0
September 6, 2025
DoorDash
Hard
Software EngineerDesign limited-time donation platform
System Design
5
0
August 9, 2025
Crowdstrike
Medium
Software EngineerDesign scalable worker pool for template jobs
System Design
2
0
October 5, 2025
Snowflake
Hard
Software EngineerDesign under vague distributed requirements
System Design
2
0
September 6, 2025
Coinbase
Hard
Software EngineerDesign account opening workflow
System Design
2
0
September 6, 2025
Google
Hard
Software EngineerDesign deduplicated file storage on filesystem
System Design
4
0
September 6, 2025
OpenAI
Hard
Software EngineerDesign ChatGPT homepage with streaming choices
ML System Design
3
0
July 27, 2025
LinkedIn
Hard
Machine Learning EngineerDesign a distributed key-value store
System Design
3
0
July 16, 2025
Meta
Medium
Software EngineerDesign an online chess game with undo and leaderboard
System Design
5
0
November 22, 2025
Pinterest
Hard
Software EngineerDesign a Google Photos–like service
System Design
3
0
September 6, 2025
Snowflake
Hard
Software EngineerDesign cache for DAG-based query views
System Design
4
0
September 6, 2025
HubSpot
Hard
Software EngineerDesign weather API with freshness guarantees
System Design
4
0
August 14, 2025
Amazon
Hard
Software EngineerDesign a URL shortening platform
System Design
3
0
September 6, 2025
Box
Hard
Software EngineerExplain and diagram your past system architecture
System Design
2
0
August 1, 2025
Meta
Hard
Software EngineerDesign coding platform leaderboard system
System Design
13
0
July 29, 2025
Amazon
Hard
Software EngineerDesign real-time top-K products service
System Design
3
0
September 6, 2025
Meta
Hard
Software EngineerDesign an online auction platform
System Design
4
0
September 6, 2025
Nordstrom
Hard
Software EngineerDesign and evolve a reservation system
System Design
3
0
July 17, 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.