Built for engineers who know the answers but struggle to say them clearly under interview pressure.
What is ACID in databases?
What is agile development?
What is the difference between authentication and authorization?
What is the CAP theorem?
What is the difference between concurrency and parallelism?
What is the difference between hashing and encryption?
What is the difference between horizontal and vertical scaling?
How does the Node.js event loop work?
What is idempotency in APIs?
What are the pros and cons of JWT?
How do you make Docker containers lightweight?
What is the event loop in Node.js?
How many types of streams are there in Node.js?
What is the Global Interpreter Lock (GIL) in Python?
What are best practices for building REST APIs?
What are common security best practices in backend systems?
What is a database transaction?
What is a closure in JavaScript?