I wish I had a cheat sheet like this when I was prepping for System Design Interviews

Trust me, it would’ve saved me so much time. But now, I’m sharing it with you.

https://www.linkedin.com/posts/rajatgajbhiye_system-design-cheatsheet-activity-7346171909996216320-I-v7

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System Design used to scare me.

I remember preparing for my first few interviews — reading random blogs, watching hours of YouTube videos, and still feeling lost when someone asked me about CAP or caching strategies. 😓

That’s when I realized…

System design isn’t about knowing everything. It’s about understanding the right things deeply.

Over time, I figured out that 80% of system design interview questions come from just 20% of concepts.

So, I created this guide:
Focused. Structured. Real-world backed.

Here’s what’s inside👇

✅ 4-Step Roadmap (esp. if your interview is in 15 days)
✅ 15+ core concepts broken down in simple terms
✅ Basics → Advanced (CAP, Queues, Microservices, Caching, DBs, etc.)
✅ 50 System Design Q&A (with diagrams + examples)
✅ Ultimate Cheat Sheet for quick revisions

Use the coupon code SDE10 to get a 10% discount (limited slots only)

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

One important note to all SDE1/ SDE2

While working for your company, don't forget to revise DSA, System Design, and OS/CN.

To help you out, here are some useful resources:

https://www.linkedin.com/posts/rajatgajbhiye_one-important-note-to-all-sde1-sde2-while-activity-7346533980671729664-tenY

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DSA a day can keep interview rejection away.

https://www.linkedin.com/posts/rajatgajbhiye_dsa-a-day-can-keep-interview-rejection-away-activity-7346767575122436097-3lt0

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I screwed up 2 interviews because I didn’t solve my Low-Level Design (LLD) problems properly.

Here is a complete roadmap for learning Low-Level Design (LLD):

https://www.linkedin.com/posts/rajatgajbhiye_i-screwed-up-2-interviews-because-i-didn-activity-7346898981722935296-5Frd

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Everything works fine… until that one broken pipeline shows up.😅
And guess who everyone’s looking at? 𝗧𝗵𝗲 𝗗𝗮𝘁𝗮 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿!

https://www.linkedin.com/posts/rajatgajbhiye_dataengineering-careerswitch-kafka-activity-7347101362733641728-XHum

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Atlassian Interview Experience
Compensation: 54L + 9
Position: Senior Software Engineer
Application Method: Direct Application

https://www.linkedin.com/posts/rajatgajbhiye_atlassian-interview-experience-compensation-activity-7347255496329814017-l09E

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These 22 System Design patterns cover 90% of the interviews you’ll ever face 👇

https://www.linkedin.com/posts/rajatgajbhiye_these-22-system-design-patterns-cover-90-activity-7347474388402778112-VYgG

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If anybody is saying System Design is overrated in software engineering, ask them to give few interviews, be it for SDE/SDE2/SDE3 role.

They quickly realize that mastery of DSA alone won’t land the job at top PBCs.

https://www.linkedin.com/posts/rajatgajbhiye_if-anybody-is-saying-system-design-is-overrated-activity-7347888224213565440-8xpE

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System Design isn't just knowing the CAP theorem.
System Design isn't just drawing boxes and arrows.
System Design isn't just about caching and load balancers.
System Design isn't just scaling with microservices.
System Design isn't just selecting the right DB.
System Design isn't even about having all the right answers.

It's about asking the right questions when everything feels arguable.
It's about balancing business goals with engineering constraints.
It's about defending decisions that might break under real-world traffic.
It's about simplifying the complex, not just scaling it.

And yes, it’s one of the toughest rounds to crack in top tech interviews.

𝗧𝗵𝗮𝘁’𝘀 𝘄𝗵𝘆 𝗜’𝘃𝗲 𝗰𝗼𝗺𝗽𝗶𝗹𝗲𝗱 𝗲𝘃𝗲𝗿𝘆𝘁𝗵𝗶𝗻𝗴 𝗶𝗻𝘁𝗼 𝗮 𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗞𝗜𝗧 𝘁𝗼 𝗺𝗮𝗸𝗲 𝗽𝗿𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻 𝗲𝗮𝘀𝗶𝗲𝗿

𝗚𝗲𝘁 𝗶𝘁 𝗵𝗲𝗿𝗲: https://lnkd.in/dte69Z5N

Stay Hungry, Stay FoolisH!

No matter if you have 1, 2, or 10 years of experience.

Truth is:

If you are giving an interview at any good product-based company, 3-5 rounds are just:

- DSA, Development (2 to 3 rounds), and
- System Design (1 to 2 rounds)

No matter what others say, that's my experience: we have to excel in these three areas (DSA, Development, and System Design, including LLD and HLD) to clear any interview; there are no shortcuts.

The below playlist will help you in your preparation:

https://www.linkedin.com/posts/rajatgajbhiye_no-matter-if-you-have-1-2-or-10-years-of-activity-7348250165037666305-z8yP

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Don’t go for interviews until you do THIS.

https://www.linkedin.com/posts/rajatgajbhiye_dont-go-for-interviews-until-you-do-this-activity-7348342618415595520-vL46

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Save the post, you’ll need this during interviews 👍🏼👍🏼

I am getting 10+ calls weekly (in 2025) directly from recruiters after using these two tricks.

https://www.linkedin.com/posts/rajatgajbhiye_i-am-getting-10-calls-weekly-in-2025-directly-activity-7348574270349836288-z5XS

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You’re not building Instagram in 45 minutes

Most of us freak out when we hear the interview question

https://www.linkedin.com/posts/rajatgajbhiye_youre-not-building-instagram-in-45-minutes-activity-7348705141077782528-xWoP

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You’re not building Instagram in 45 minutes

Most of us freak out when we hear the interview question.

- Design Instagram
- Design Zomato
- Design a scalable chat app.

But guess what?
- They're not expecting you to architect the real thing in 45 minutes.
- They're not judging your drawing skills or how you draw your boxes.

They’re looking at how you approach the problem:
- How you break down a vague problem into components?
- What questions you ask before you jump in?
- What trade-offs you make?
- How you handle scale and complexity?

𝗧𝗵𝗮𝘁’𝘀 𝘄𝗵𝘆 𝗜’𝘃𝗲 𝗰𝗼𝗺𝗽𝗶𝗹𝗲𝗱 𝗲𝘃𝗲𝗿𝘆𝘁𝗵𝗶𝗻𝗴 𝗶𝗻𝘁𝗼 𝗮 𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗞𝗜𝗧 𝘁𝗼 𝗺𝗮𝗸𝗲 𝗽𝗿𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻 𝗲𝗮𝘀𝗶𝗲𝗿

𝗚𝗲𝘁 𝗶𝘁 𝗵𝗲𝗿𝗲: https://topmate.io/rajat_gajbhiye/1446625

Stay Hungry, Stay FoolisH!

Give me 2 minutes, and I will tell you

7 ways to get your next job in 3 months.

https://www.linkedin.com/posts/rajatgajbhiye_give-me-2-minutes-and-i-will-tell-you-7-activity-7348926874091151360-76p1

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System Design round gaya haath se

Mujhe laga CAP theorem bata diya, toh baat ban jayegi.

Boxes and arrows draw kiye, scale bola, cache bola, but…

Interviewer ne kaha
"What if traffic spikes by 10x suddenly?"

I was blank.

That day I understood…
System Design isn’t about right answers.

It’s about:
- Asking the right questions
- Thinking in trade-offs
- Communicating like a leader

Baaki sab toh sab kar lete hai, real prep yeh hai.

Isi mindset ke sath maine banaya System Design Guide.

2000+ engineers ne use kiya.
- TCS, Infosys, Wipro, Capgemini
- Transitioned to Product Companies

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

Stay Hungry, Stay FoolisH!

If you apply to Zomato for an SDE role,
you’ll face a System Design round.

If you apply to Razorpay or Atlassian,
you’ll face a System Design round.

https://www.linkedin.com/posts/rajatgajbhiye_if-you-apply-to-zomato-for-an-sde-role-you-activity-7349288269559267328-pMfT

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One day or Day one. You decide.

Software Engineering edition.

𝗢𝗻𝗲 𝗗𝗮𝘆: I will start learning System Design.
𝗗𝗮𝘆 𝗢𝗻𝗲: Read about scalability and load balancing.

𝗢𝗻𝗲 𝗗𝗮𝘆: I will understand database sharding.
𝗗𝗮𝘆 𝗢𝗻𝗲: Watch a video on sharding vs. replication and take notes.

𝗢𝗻𝗲 𝗗𝗮𝘆: I will learn about caching.
𝗗𝗮𝘆 𝗢𝗻𝗲: Set up Redis and experiment with caching strategies.

https://www.linkedin.com/posts/rajatgajbhiye_one-day-or-day-one-you-decide-software-activity-7349436503292350465-FOwH

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