Sujal Kumar

ex-Software Engineer Intern @Samsung | NITJ'26 | Specialist @codeforces | Knight @Leetcode | Into cool stuff

[Sujal Kumar @sujal_here]

On a random friday

[Sujal Kumar @sujal_here]

@arlanr Do checkout switch personality mode on my website : https://t.co/dBmLkOyza6

[Sujal Kumar @sujal_here]

@arlanr Will plat work? Professional jett instlocker though

[Sujal Kumar @sujal_here]

@Muskanjain0401 https://t.co/dBmLkOyza6

[Sujal Kumar @sujal_here]

GE qualified for Masters London. Lessggoooo!!!!

#GEfighting #vct

[Sam Khawasé @samkhawase]

What if India built GitHub?

[Sujal Kumar @sujal_here]

@Yagami_dn_ #cfbr

[Sujal Kumar @sujal_here]

Nice one

[Sujal Kumar @sujal_here]

A lot of developers “learn” System Design by watching one YouTube video on:

“How to Design Instagram”

Then they draw:

Load Balancer → App Servers → Redis → Kafka → DB

…and think they understand architecture.

You don’t understand System Design until you can explain:

Why Redis is needed
What happens when cache misses spike
Why Kafka instead of direct writes
How DB replication affects consistency
What fails first at 100x traffic

System Design is not diagram drawing.

It’s reasoning under constraints.

[Sujal Kumar @sujal_here]

@SaumyaYadav817 Okayish, i think

[Sujal Kumar @sujal_here]

@atharvuntwale20 @ramxcodes Nice one, but make it mobile resposive too, reduce the text sizes and all and it would be much better

[Sujal Kumar @sujal_here]

Hey guys, i am at #33 at product hunt today, can you guys upvote and checkout my product https://t.co/39axUFFADy

[Sujal Kumar @sujal_here]

@Kiriakosydf Sure, lets try

[Sujal Kumar @sujal_here]

Codentis: Run intelligent workflows directly in your terminal https://t.co/QXPbCOq72U by @sujal_here

[Sujal Kumar @sujal_here]

Shipped Codentis, a CLI-based AI agent with real-time streaming, persistent context, and 10+ developer commands. Designed it end-to-end with modular agent loops and async reliability. It’s already being used by devs. Also have experience at Samsung R&D working on ML pipelines. Would love to contribute.

Link: https://t.co/qvLzhCYY8J

[Sujal Kumar @sujal_here]

I used to think Auth was simple.

“Login karo, token do, ho gaya.”

Then I tried building it properly:
– Secure password storage
– JWT lifecycle
– Middleware chaining
– Role-based access
– Handling edge cases

That’s when I realized:
> Authentication ≠ Authorization
> And most tutorials oversimplify it

So I wrote the guide I wish I had:
A practical breakdown with real backend flows (Node.js + JWT + MongoDB)

If you’re a developer, this will save you hours of confusion.

Read 👇
https://t.co/FQ2MJIFwyZ

You can also find this blog on blogs page in my portfolio website: https://t.co/tn0nFTv0sx

[Sujal Kumar @sujal_here]

@mscode07 https://t.co/aTNndWVIvQ

Gonna launch it soon on product hunt

[Sujal Kumar @sujal_here]

Just gave my portfolio a fresh update 🚀

Built, shipped, and refined projects I’m genuinely proud of especially in AI and full-stack systems.

Would love for you to check it out and share feedback: https://t.co/dBmLkOyza6

Always building. Always improving.

[Sujal Kumar @sujal_here]

Ahh!