It took me 4 months to build this guide. I’ve divided it into three parts:

Fifteen-Day Preparation Strategy: Get prepped with all the necessary concepts in just 15 days.

System Design Concepts: Everything you need to know about system design.

45 Solved Questions: Detailed answers with HLD diagrams, LLD code, and in-depth explanations.

Check out the Guide: https://topmate.io/rajat_gajbhiye/1446625

6 Rounds. 56LPA. The Google Interview Breakdown
Role: SDE-2 (L3)
Application Mode: Recruiter Outreach

https://www.linkedin.com/posts/rajatgajbhiye_6-rounds-56lpa-the-google-interview-breakdown-activity-7366099618071293954-2Be5

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I did not like DSA until

I found these 16 problem-solving patterns

https://www.linkedin.com/posts/rajatgajbhiye_i-did-not-like-dsa-until-i-found-these-16-activity-7366332360121888768-tI42

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4 years of experience. 40 LPA offer. These were the EXACT questions asked at Razorpay in 2025.

https://www.linkedin.com/posts/rajatgajbhiye_4-years-of-experience-40-lpa-offer-these-activity-7366472408918118402-kUuG

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DSA gets you shortlisted.

But it’s system design that gets you the offer, especially in 2025.

Here’s how you can start learning system design:

https://www.linkedin.com/posts/rajatgajbhiye_dsa-gets-you-shortlisted-but-its-system-activity-7366685342478794753-Am77

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A few years back, I asked a senior engineer what truly sets apart juniors from seniors.
He smiled and said:
“Juniors write code that works. Seniors design systems that last.”

That hit me hard.
Because coding can get you started,
but system design is what takes you to the next level.

That’s exactly why I created my System Design Course, to help you cross that bridge faster, and with confidence.

Get the Guide here:
- https://topmate.io/rajat_gajbhiye/1446625

Frequently Asked Interview Questions - SDE (Java/Spring Boot)
Compensation Bracket: ₹25–30 LPA

https://www.linkedin.com/posts/rajatgajbhiye_frequently-asked-interview-questions-sde-activity-7366827511353110531-gDp3

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50LPA ar Amazon

These were the EXACT questions asked in 2025

https://www.linkedin.com/posts/rajatgajbhiye_50lpa-ar-amazon-these-were-the-exact-questions-activity-7367055347301171202-uzK7

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I’ve seen people go from TCS (4 LPA) ⇾ Microsoft (35 LPA+)
I’ve seen people go from HCL (5.5 LPA) ⇾ Amazon (30 LPA)
I’ve seen people go from Wipro (4 LPA) ⇾ Dassault (20 LPA+)

https://www.linkedin.com/posts/rajatgajbhiye_ive-seen-people-go-from-tcs-4-lpa-microsoft-activity-7367191733387878400-SScX

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I wasn’t rejected for bad System Design...
(And that rejection cost me a ₹28 LPA opportunity.)

https://www.linkedin.com/posts/rajatgajbhiye_i-wasnt-rejected-for-bad-system-design-activity-7367410273466437633-pmHv

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Once you fall for System Design and Actual Software Engineering, you get bored learning or revising DSA.

Actually 80% of system design interview questions come from just 20% of topics? My guide will help you focus on what really matters.

𝗪𝗵𝗮𝘁’𝘀 𝗜𝗻𝘀𝗶𝗱𝗲?

𝗣𝗔𝗥𝗧 𝟭: 𝟰-𝗦𝘁𝗲𝗽 𝗥𝗼𝗮𝗱𝗺𝗮𝗽 (𝗜𝗳 𝗬𝗼𝘂𝗿 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝗜𝘀 𝗶𝗻 𝟭𝟱 𝗗𝗮𝘆𝘀)

1. How to Approach a System Design Interview
2. 15 Fundamental System Design Concepts
3. 3-Step Framework for System Design Interviews
4. Real-World System Design Examples

𝗣𝗔𝗥𝗧 𝟮: 𝗨𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱 𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗳𝗿𝗼𝗺 𝗕𝗮𝘀𝗶𝗰𝘀 𝘁𝗼 𝗔𝗱𝘃𝗮𝗻𝗰𝗲𝗱

𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗧𝗼𝗽𝗶𝗰𝘀 𝗖𝗼𝘃𝗲𝗿𝗲𝗱:
1. Introduction to System Design
2. Scalability and Performance
3. Latency and Throughput
4. Architectural Patterns
5. Availability and Availability Patterns
6. Replication
7. Consistency and Consistency Patterns
8. CAP Theorem
9. PACELC Theorem
10. Database and Storage
11. Relational Databases
12. Scaling Databases
13. Sharding and Partitioning
14. Non-Relational Databases
15. Choosing the Right Database
16. Caching
17. Asynchronous Processing
18. Message Queues (Kafka, RabbitMQ)
19. Monolithic vs. Microservices Architecture
20. Event-Driven Architecture
21. API Gateway and Backend for Frontend
22. REST, GraphQL, and gRPC
23. Long Polling, WebSockets, Server-Sent Events
24. Design Patterns
25. Resiliency
26. Designing for Resiliency
27. Load Balancers
28. Circuit Breakers
29. System Essentials
30. Consistent Hashing
31. Real-World Architectures & Engineering Blogs

𝗣𝗔𝗥𝗧 𝟯: 𝗨𝗹𝘁𝗶𝗺𝗮𝘁𝗲 𝗖𝗵𝗲𝗮𝘁 𝗦𝗵𝗲𝗲𝘁
This quick-reference cheat sheet covers the most important system design concepts, making it easy to review key points right before your interview.

𝗣𝗔𝗥𝗧 𝟰: 𝟱𝟬 𝗗𝗲𝘁𝗮𝗶𝗹𝗲𝗱 𝗤&𝗔 𝗳𝗼𝗿 𝗟𝗟𝗗 𝗮𝗻𝗱 𝗛𝗟𝗗
50 carefully selected interview questions, covering both Low-Level Design (LLD) and High-Level Design (HLD). Each question comes with:
- Clear explanations
- Diagrams for better understanding
- Real-world examples
- Practical insights to simplify complex topics

Do check out:
- https://topmate.io/rajat_gajbhiye/1446625

Use code SD10 for 10% off

PhonePe Software Engineer Interview Experience
Compensation: 40 LPA

https://www.linkedin.com/posts/rajatgajbhiye_phonepe-software-engineer-interview-experience-activity-7367557703876960258-Ltds

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System Design isn’t about memorizing 100 case studies. It’s about solving the 25 problems that actually get asked in interviews.

https://www.linkedin.com/posts/rajatgajbhiye_system-design-isnt-about-memorizing-100-activity-7367774163983302658-RvDJ

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JPMorganChase pays around 18-24LPA for SDE-2 and 25-34LPA for SDE-3

This is the classic question they generally ask

https://www.linkedin.com/posts/rajatgajbhiye_jpmorganchase-pays-around-18-24lpa-for-sde-activity-7367913700525105152-KRUW

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Give me 2 minutes,

I’ll tell you how to make resume ATS friendly

https://www.linkedin.com/posts/rajatgajbhiye_resume-resumetips-paidpartnership-activity-7368144145946800129-6zt0

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Many times, despite following all the tips and guidelines, resumes aren’t getting shortlisted.

𝗚𝗲𝘁 𝘆𝗼𝘂𝗿 𝗿𝗲𝘀𝘂𝗺𝗲 𝗿𝗲𝘃𝗶𝗲𝘄𝗲𝗱 𝗵𝗲𝗿𝗲:
- https://explore.preplaced.in/DmFfvI

Most engineers lose offers not because they can’t code… but because they can’t design systems at scale.

Interviews don’t just test if you can solve DSA, they test if you can think like an architect, handle trade-offs, and design for millions of users.

That’s exactly why I created the System Design Guide:
- Covers the most asked interview problems
- Breaks down concepts into human-friendly explanations
- Teaches you frameworks to approach ANY design question

Get the Guide here:
- https://topmate.io/rajat_gajbhiye/1446625

If I could give just 1 piece of advice to any SDE starting their backend prep today…

It would be → Master Java.

https://www.linkedin.com/posts/rajatgajbhiye_if-i-could-give-just-1-piece-of-advice-to-activity-7368512127277453314-Bkhg

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Big News

I’m dropping my first ever YouTube video this evening.

It’s not just another DSA video, It’s the only roadmap you’ll need for coding interviews in 2025.
No 100-day challenges. No random PDFs. No wasting months.

I’ve put in weeks of effort (and god-level editing) to make this super clear and beginner-friendly.

If you’re preparing for coding interviews, trust me. you don’t want to miss this.

Do me a favor: Subscribe to my channel right now so you get notified when it’s live
- https://youtube.com/@rajat_gajbhiye

Let’s make DSA prep smarter, not harder!