Career & Technical Mastery

Technical Interview Prep Hub

50+ curated interview questions, system design walkthroughs, and DSA patterns with clean explanations.

How to Crack Technical Interviews (2026 Guide)

Welcome to my comprehensive technical interview prep hub. After sitting on both sides of the interviewing table for over a decade, I've compiled this living document to help you master the core concepts that actually matter. This isn't just a list of questions to memorize—it's a framework for understanding.

1. The "Why" Behind the Code (System Design)

Modern software engineering interviews, especially for Mid-to-Senior roles, heavily index on system design. It's not enough to know how to write a for loop; you must understand trade-offs. When should you use a NoSQL database over a relational database? Why would you choose a monolithic architecture over microservices for a startup? The questions below on System Design and Database Architecture are curated to build your intuition around these trade-offs.

2. Data Structures & Algorithms (The Fundamentals)

While many developers groan at LeetCode-style questions, DSA remains the universal language of technical interviews. My approach is to focus on patterns rather than rote memorization. Master the Sliding Window, Two Pointers, and Breadth-First Search. If you recognize the pattern, the specific question becomes trivial.

3. Language Specifics & Gotchas

Whether you're interviewing for a PHP, JavaScript, or Python role, interviewers love probing the edges of the language. Do you understand JS closures and the Event Loop? Can you explain PHP's new JIT compiler or match expressions? Use the topic filters below to dive deep into language-specific intricacies.

💡 Pro Tip from Santosh: Don't just read these answers. Use the "Copy Answer" button, paste it into the Web IDE, and break the code. Learning happens when you debug your own mistakes.
3 Questions
Active Recall 3 Flashcards

Interview Flashcards & Mock Mode

Practice with 3D flip cards, voice reader, and timed interview simulations.

Code Screenshots Free Tool

CodeShot.in — Beautiful Snippets

Turn your code snippets into retina-sharp images with analog film aesthetics and syntax auto-detection.

What is JWT (JSON Web Token) and how does it work?
Security Intermediate

JWT is a compact, self-contained token used for authentication and authorization. It contains encoded user data and is signed to prevent tampering. It's like a stamped ID badge—the guard checks the stamp without calling HR every time.

Security Authentication Backend
What are the three parts of a JWT?
Security Intermediate

A JWT has three parts: Header (algorithm info), Payload (user claims/data), and Signature (verification). They are base64-encoded and separated by dots.

Security Authentication
What is the difference between authentication and authorization?
Security Intermediate

Authentication verifies who you are (logging in). Authorization determines what you're allowed to do (access control). A hotel key card authenticates you; the floor it opens authorizes your access.

Security Authentication