Interview Notes &
Study Guides 2026
Curated interview preparation notes for JavaScript, NodeJS, SQL, React, Python, DSA and System Design. Used by 10,000+ developers to crack top tech interviews.
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JavaScript Interview Questions
Top 50 JavaScript questions covering closures, promises, async/await, prototypes, and ES6+ features.
NodeJS Interview Questions
Complete NodeJS guide — event loop, streams, Express, REST APIs, authentication, and performance.
SQL Interview Questions
SQL queries, joins, indexes, normalization, transactions and database design patterns.
React Interview Questions
React hooks, state management, performance optimization, and component patterns.
Python Interview Questions
Python fundamentals, OOP, decorators, generators, and data structures.
DSA Interview Questions
Arrays, linked lists, trees, graphs, dynamic programming and common coding patterns.
System Design Guide
Design scalable systems — load balancers, databases, caching, microservices and real-world examples.
HR & Behavioral Questions
Common HR questions, STAR method answers, salary negotiation, and interview etiquette.
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