Top 73 System Design Interview Questions & Answers (2026)
About System Design
Top 100 System Design interview questions covering scalability, load balancing, caching, databases, microservices, distributed systems, and designing real-world systems. Companies hiring for System Design roles test this knowledge at every stage — from first-round screens that check the basics to final-round conversations about real-world trade-offs.
What to Expect in a System Design Interview
Expect a mix of conceptual and practical System Design questions: clear definitions and core-concept checks for junior roles, hands-on scenario questions for mid-level roles, and architecture or trade-off discussions for senior roles. Interviewers usually move from foundational topics toward the kind of problems you'd actually face on the job.
How to Use This Guide
Work through the System Design questions in order — Beginner, then Intermediate, then Advanced — so each concept builds on the last. Every question has its own page; bookmark the ones that trip you up and revisit them the day before your interview.
Curated by Tech Baithak Editorial Team · Last updated: May 2026
Core concepts every System Design developer must know.
Practical knowledge for developers with hands-on experience.
Deep expertise questions for senior and lead roles.