Emon Ideas

12/09/2026

Backend Note ⚙️

Transactions prevent partial updates.
They don’t automatically prevent race conditions.

If two requests read the same balance at the same time,
both will pass validation and try to deduct stock.

Never validate and modify shared state in application memory.
Push atomic constraints directly to the database.

Check-then-act is a bug waiting to happen.

02/09/2026

02/09/2026

Backend Note ⚙️

When one operation changes multiple pieces of data,
a partial update can leave your system in an inconsistent state.

Use a database transaction when those changes must succeed or fail together.

All or nothing.

31/08/2026

Database Note 🗄️

If you only need a few columns,
there’s no reason to fetch everything.

SELECT * is convenient,
but being explicit about what you need
can make your queries more efficient.

Small decisions matter in backend engineering.

24/12/2025

Engineering Note 🧠

Before optimizing code,
make sure you understand the problem.

Many performance issues are solved
by better thinking, not faster code.

21/12/2025

DSA Note 🧠

DSA is not about memorizing algorithms.
It’s about learning how to think.

When you understand patterns,
you can solve problems you’ve never seen before.

That’s the real value of DSA.

20/12/2025

API Note 🔗

GET requests should never change data.

If fetching data modifies state,
your API design is broken.

Predictability is a feature,
not a limitation.

20/12/2025

Career Note 🎯

Learning tools is easy.
Learning how to think is hard.

Frameworks change.
Fundamentals stay.

Focus on understanding problems,
not just mastering tools.

19/12/2025

Backend Note ⚙️

If a query feels slow,
don’t assume the database is the problem.

Check first:
• Data size
• Indexes
• Query pattern

Most performance issues are design issues.

18/12/2025

Debugging Note 🐛

When something breaks,
don’t change random code.

First, understand:
• What changed?
• When did it start?
• What assumptions might be wrong?

Debugging is thinking, not guessing.