3-5 Years
Real interview questions with expert answers, plain-English explanations, and practical examples. (26 questions)
Netflix
Backend Developer
Caching
When would you use different caching strategies like write-through or write-back, and how do you handle cache invalidation?
ServiceNow
Cloud Engineer
Cloud Architecture
How do you design a highly available and fault-tolerant cloud application?
Microsoft
Backend Developer
API Design
How do you design an idempotent API endpoint, and why does it matter for payment retries?
Flipkart
Frontend Developer
React
How does React’s reconciliation (virtual DOM diffing) actually decide what to re-render?
Adobe
Backend Developer
Concurrency
Explain a race condition and how a mutex actually prevents it, with a concrete example.
Salesforce
Cloud Engineer
Containers & Kubernetes
How do containers differ from virtual machines, and when would you choose Kubernetes for orchestration?
Tech Mahindra
Mobile Developer
Performance Optimization
How do you optimize a mobile app for performance and battery life?
Infosys
AI Engineer
Machine Learning
How would you handle class imbalance in a fraud detection model?
Google
Data Engineer
Databases
What’s the difference between OLTP and OLAP, and how does that affect schema design?
Amazon
SRE
Networking