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!

I’m super excited (and honestly a little nervous 😅) to share this, I just uploaded my first ever YouTube video!

https://www.linkedin.com/posts/rajatgajbhiye_im-super-excited-and-honestly-a-little-activity-7368615014133428225-yFkM

It would mean a lot if you give it a watch, drop your feedback, and subscribe ❤️

I cracked a 20L+ CTC job.

https://www.linkedin.com/posts/rajatgajbhiye_i-cracked-a-20l-ctc-job-i-was-happy-activity-7368855741576687616-7l7l

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I’m super excited (and honestly a little nervous 😅) to share this, I just uploaded my first ever YouTube video!

Complete Dsa Roadmap:
- https://m.youtube.com/watch?v=WRA5OfeUP9I

It would mean a lot if you give it a watch, drop your feedback, and subscribe ❤️

Isliye karo DSA

https://www.linkedin.com/posts/rajatgajbhiye_isliye-karo-dsa-watch-full-dsa-roadmap-activity-7369001702512902147-9smB

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Meta – 85% rounds are (DSA + System Design)
Google – 80% (DSA + System Design)
Amazon – 70% (DSA + System Design)
Microsoft – 75% (DSA + System Design)

https://www.linkedin.com/posts/rajatgajbhiye_meta-85-rounds-are-dsa-system-design-activity-7369217626817982464-RNpl

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Atlassian pays around 50-70LPA for SDE-1 and 60-90LPA for SDE-2

This is the classic question they generally ask

https://www.linkedin.com/posts/rajatgajbhiye_atlassian-pays-around-50-70lpa-for-sde-1-activity-7369368850582241283-IUhV

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From Zero to 𝟯𝟬 𝗟𝗣𝗔 in Software Engineering,
Here’s the Roadmap I’d Use...

https://www.linkedin.com/posts/rajatgajbhiye_from-zero-to-%F0%9D%9F%AF%F0%9D%9F%AC-%F0%9D%97%9F%F0%9D%97%A3%F0%9D%97%94-in-software-engineering-activity-7369598300636819456-wwTS

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

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

3 months of job hunting → 26 LPA package.
Here’s what really worked for me:

https://www.linkedin.com/posts/rajatgajbhiye_3-months-of-job-hunting-26-lpa-package-activity-7369727978114560007-ElTO

Do read 👍🏼❤️

Flipkart interviewer: Your backend service works fine in staging, but crashes in production. Users can’t log in. Too many requests. You have 30 minutes to find the issue. Go

https://www.linkedin.com/posts/rajatgajbhiye_flipkart-interviewer-your-backend-service-activity-7369943475552686080-bn_5

Do read ❤️ Comment your views 👍🏼

70, 65, 60, 59, 93, 94. These were my diploma percentage.
Everyone was shocked, but no one knew what had changed.

https://www.linkedin.com/posts/rajatgajbhiye_70-65-60-59-93-94-these-were-my-diploma-activity-7370075095081496576-jhZy

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