@mehradsadeghi

Mehrad

@mehradsadeghiJoined September 2026

Here is the place where I share my knowledge and experiences in technologies, life and etc.

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MehradSadeghimehradsadeghi.hashnode.dev5 posts

Automated Testing in Backend Development: A Complete Guide from Unit Tests to Fuzz Testing

If you had to change one of your critical services right now, how confident are you that the change wouldn't silently break something else in your codebase ? And harder still — if the only way to be s

Sep 27 · 28 min readmehradsadeghi.hashnode.dev

The Outbox Pattern Explained: A Complete Guide to Reliable Messaging in Distributed Systems

What happens if your database successfully commits a transaction, but your Message Broker becomes unavailable at exactly the same moment ? Imagine a user places an order in an online store, and the or

Sep 22 · 20 min readmehradsadeghi.hashnode.dev

Circuit Breaker Pattern Explained: How to Prevent Cascading Failures in Distributed Systems

What happens when one service fails, but your entire system keeps calling it anyway ? Imagine your payment service is down. Normally, every purchase request follows a path like this: User ↓ Order Ser

Sep 16 · 19 min readmehradsadeghi.hashnode.dev

MySQL Overselling: Why SELECT Isn't Enough and How SELECT ... FOR UPDATE Solves It

Imagine you’re running an online store, there’s exactly one item left in stock. Two customers click Buy at almost exactly the same time. Both requests reach your application. Both transactions ask the

Sep 13 · 8 min readmehradsadeghi.hashnode.dev

Two Transactions, One Row: What Does MySQL Actually Let You See ?

Can one transaction see another transaction’s uncommitted changes ? Can the same query return different results inside a single transaction ? And why does SELECT sometimes give you a snapshot, while S

Sep 13 · 8 min readmehradsadeghi.hashnode.dev

Mehrad

About

Available for

Mehrad's blogs

Automated Testing in Backend Development: A Complete Guide from Unit Tests to Fuzz Testing

The Outbox Pattern Explained: A Complete Guide to Reliable Messaging in Distributed Systems

Circuit Breaker Pattern Explained: How to Prevent Cascading Failures in Distributed Systems

MySQL Overselling: Why SELECT Isn't Enough and How SELECT ... FOR UPDATE Solves It

Two Transactions, One Row: What Does MySQL Actually Let You See ?

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Mehrad

About

Available for

Mehrad's blogs

Automated Testing in Backend Development: A Complete Guide from Unit Tests to Fuzz Testing

The Outbox Pattern Explained: A Complete Guide to Reliable Messaging in Distributed Systems

Circuit Breaker Pattern Explained: How to Prevent Cascading Failures in Distributed Systems

MySQL Overselling: Why SELECT Isn't Enough and How SELECT ... FOR UPDATE Solves It

Two Transactions, One Row: What Does MySQL Actually Let You See ?