Experience Level
3-5 Years
Real interview questions with expert answers, plain-English explanations, and practical examples. (200 questions)
Google
Backend Developer
Databases
Explain database transactions, ACID properties, and how they ensure data integrity in a concurrent application.
LTIMindtree
Cloud Engineer
Cloud Architecture
How do you choose between IaaS, PaaS, and SaaS, and what are the key considerations for a hybrid cloud strategy?
Microsoft
Backend Developer
Concurrency
How do you ensure thread safety in a multi-threaded application, and what mechanisms are available beyond basic locks?
VMware
Network Engineer
Security
How do you choose between various VPN protocols (IPsec, SSL/TLS, WireGuard), and what are the key design considerations for a highly secure and performant VPN solution?
LinkedIn
Backend Developer
Authentication & Authorization
When would you choose OAuth 2.0 over API Keys for third-party access, and what are the key flows involved?
Mphasis
Data Engineer
Message Queues
How do message queues facilitate real-time data processing and what are their common use cases in a data pipeline?
Airbnb
Full Stack Developer
API Design
How do you design a robust API error handling strategy, and what information should an error response actually include?
Zomato
Backend Developer
Data Structures & Algorithms
How would you implement a least recently used (LRU) cache, and what are its core components?
Intuit
Full Stack Developer
Data Structures & Algorithms
When would you choose a hash map over a balanced binary search tree, and what are their fundamental performance tradeoffs?
Atlassian
DevOps Engineer
Linux