Medium-level research interview questions covering advanced methodologies and analysis techniques. Q1: Explain different experimental designs and when to use each. Answer: Between-Subjects Design Pros: No learning effects, simpler analysis Cons: Need more participants, individual differences Within-Subjects Design …

Easy-level scalability interview questions covering fundamental scaling concepts. Q1: What is scalability and why does it matter? Answer: Definition: System's ability to handle increased load by adding resources. Why It Matters: Handle growth without rewriting Maintain performance under load Cost-effective resource …

Hard-level scalability interview questions covering extreme scale, global distribution, and advanced optimization. Q1: Design a globally distributed database with strong consistency. Answer: Challenge: CAP theorem - can't have all three (Consistency, Availability, Partition tolerance). Two-Phase Commit (2PC): …

Medium-level scalability interview questions covering advanced scaling techniques and optimization. Q1: Explain database partitioning strategies. Answer: Horizontal Partitioning (Sharding) Range Partitioning: Hash Partitioning: Vertical Partitioning Q2: How do you handle database hotspots? Answer: Problem: Uneven data …

Easy-level system design interview questions covering fundamental system design concepts and simple applications. Q1: Design a URL shortener (like bit.ly). Answer: Requirements Shorten long URLs to short codes Redirect short URLs to original Track click statistics High availability High-Level Design Database Schema URL …

Hard-level system design interview questions covering globally distributed, highly scalable systems. Q1: Design WhatsApp/Telegram (Global Messaging). Answer: Requirements 2B users globally Real-time messaging End-to-end encryption Group chats (256 members) Media sharing 99.99% uptime <100ms latency Global …

Medium-level system design interview questions covering complex distributed systems. Q1: Design Twitter/X. Answer: Requirements Post tweets (280 chars) Follow/unfollow users Timeline (home feed) Search tweets Trending topics 500M users, 100M DAU Architecture Tweet Flow Timeline Generation Fanout Strategies: Database …

Easy-level technical due diligence interview questions covering fundamental assessment areas. Q1: What is technical due diligence and why is it important? Answer: Definition: Systematic evaluation of a company's technology assets, infrastructure, and capabilities. Why Important: Identify technical risks Validate claims …

Hard-level technical due diligence interview questions covering strategic and complex assessments. Q1: How do you assess technical debt and create a remediation roadmap? Answer: Debt Quantification Framework Prioritization Matrix Remediation Roadmap: Assessment Deliverables: Debt inventory with cost estimates Risk …

Medium-level technical due diligence interview questions covering deeper assessment methodologies. Q1: How do you conduct a comprehensive architecture review? Answer: Multi-Layer Assessment Key Questions: Is the architecture documented? Are concerns properly separated? How are services communicating? What are the …