All My Interview Preparation Books and Bundles in One Place Over the years, I’ve created multiple interview preparation books and digital products on Topmate and Gumroad. I regularly receive DMs asking for purchase links, so I decided to put everything in one place. If you’re preparing for technical interviews in Java, Backend, Frontend, MERN, React.js, or React Native, bookmark this post. You’ll find all the links below. Individual Books 1. Cracking the Java Interview With Sumit Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/qturr Hard Copy: store.pothi.com/book/sumit-m… 2. Cracking the Backend Interviews Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/fmepsw 3. Cracking the Frontend Interviews Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/jfsmf 4. Cracking the MERN Interviews Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/imzsr 5. Cracking the React.js Interviews Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/qqheh 6. Cracking the React Native Interviews Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/yakhkx Bundle Offers 1. All-in-One Bundle: Backend + Frontend + Java + React.js + MERN + React Native Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/ypbkul 2. Java Interview Preparation Bundle Includes the Java Book PDF + Java Interviews in 2026 Webinar Recording. Topmate: topmate.io/interviewswithsum… 3. Java + React.js + MERN Bundle Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/rikeb 4. React.js + MERN Bundle Gumroad: msumit.gumroad.com/l/rikeb 5. Java + MERN Bundle Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/psdfn 6. Java + React.js Bundle Topmate: topmate.io/interviewswithsum… Gumroad: msumit.gumroad.com/l/gvabt The goal is simple: help you understand the concepts that matter, prepare for the questions interviewers ask, and approach your next opportunity with more confidence. Thank you for your continued trust and support. It genuinely means a lot.

You have a Java application that performs a transaction across two different databases (DB1 and DB2). How would you ensure data consistency and reliability across both databases during the transaction?

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" Explain SOLID principles " is one of the most asked interview questions. I see candidates usually steuggling to explain Liskov's Substitution Principle. Covered it in the book to explain it perfectly :

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WHAT ??

Commonly asked SQL Query Interview Question : You have a table Users with the following columns: user_id (INT) email (VARCHAR) signup_date (DATE) Write a query to find users who signed up multiple times with the same email but on different days.

As a developer , Have you ever thought : What exactly is stored inside DB index ... Is it a full row, pointer, or something else?

SALARY SHOULD COVER BOTH TOO ?

Anyone still using console.log ?

Who is richer ?

As a developer, have you ever asked yourself : Why do we add SSH keys to Git in the first place? Is it just to avoid typing passwords… or is there something deeper happening during authentication?

Q4 REMINDER !! Minimum salaries as per experience in software development in India that you should aim for in 2026 : 2 years experience - 10 LPA 5 years experience - 22 LPA 7 years experience - 30 LPA 10 years experience - 42 LPA 12 years experience - 50 LPA 15 years experience - 70 LPA I think these are the minimum numbers that you should be looking at. If you are earning below this , you need to fix it.

Starting Java multithreading ? Start with : - How to Create/Join and interrupt a Thread - Threads Synchronization - Happens-before Relationship - Locks Granularity - Volatile Variables - Atomic Variables - Wait/Notify and the Producer-Consumer Pattern - ThreadLocal Variables

Material UI or Ant Design?

One backend concept that’s rarely discussed but crucial: Backpressure. Its how a system handles cases where the producer is faster than the consumer. Without it, queues can fill up, memory spikes, and services fail. Used in Kafka, WebFlux, gRPC, and RxJava , it's essential for resilient systems. Have you heard about it ?