Uber
Hard
Software EngineerDesign Uber Eats-style search function
System Design
24
0
November 11, 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
Medium
Software EngineerDesign API that aggregates three downstream APIs
System Design
18
0
November 4, 2025
Airbnb
Hard
Software EngineerDesign a real-time chat system with hot groups
System Design
35
0
January 22, 2026
Anthropic
Hard
Software EngineerDesign production-ready dedup service
System Design
15
0
September 6, 2025
Rippling
Hard
Software EngineerDesign a user behavior tracking system
System Design
34
0
February 11, 2026
OpenAI
Hard
Software EngineerDesign a crossword puzzle solver system
System Design
31
0
February 11, 2026
Databricks
Hard
Software EngineerDesign a KV store with QPS API
System Design
13
0
February 4, 2026
Roblox
Hard
Software EngineerDesign sliding-window rate limiter with multi-keys
System Design
24
0
July 16, 2025
Coinbase
Hard
Software EngineerDesign a bank account ledger
System Design
24
0
September 6, 2025
OpenAI
Hard
Software EngineerDesign an online ads serving system
System Design
23
0
September 6, 2025
Axon
Hard
Software EngineerDesign an airline booking system
System Design
22
0
August 7, 2025
OpenAI
Medium
Software EngineerDesign webhook, POI, chat, CI/CD, payments
System Design
13
0
July 4, 2025
Plaid
Easy
Software EngineerDesign a ChatGPT-like conversational assistant
System Design
23
0
February 4, 2026
Datadog
Hard
Software EngineerDesign log-query stream processor
System Design
37
0
July 29, 2025
Plaid
Easy
Software EngineerDesign a geo-distributed rate limiter
System Design
19
0
February 4, 2026
Anthropic
Hard
Software EngineerDesign a scalable network I/O service
System Design
16
0
September 6, 2025
Fanatics
Hard
Software EngineerDesign a retail trading platform
System Design
19
0
September 6, 2025
Databricks
Hard
Software EngineerDesign a Visa-like payment processing system
System Design
11
0
February 12, 2026
Roblox
Medium
Software EngineerDesign a rate limiter
System Design
14
0
January 22, 2026
Anthropic
Hard
Machine Learning EngineerDesign an inference routing and scheduling layer
ML System Design
18
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.