Developer Diary

If you want to learn SOLID Principles and Design Patterns to crack your interviews, you must first have a strong understanding of OOP concepts.

I’ve explained OOP in simple language using PHP to make it easy to understand, especially for beginners and intermediate developers.

I highly recommend going through this article at least once and taking some time to properly understand the fundamentals.



Sharing the link below 👇

PHP OOP Concepts Explained with Simple Examples Object-Oriented Programming (OOP) is a powerful paradigm that helps developers write clean, reusable, and maintainable code. PHP supports…

If you are preparing for technical interviews, SOLID Principles are something you must know.

👉 SOLID principles are asked in almost every interview
👉 They are critical for LLD (Low Level Design) and HLD (High Level Design) interview rounds

Understanding SOLID shows interviewers that you can design maintainable systems, not just write working code.

SOLID Principles in Software Development (With Node.js Examples) If you are preparing for technical interviews, SOLID Principles are something you must know.

🚀 Built a Production-Ready URL Shortener (LLD) using Node.js

This project demonstrates Low-Level Design (LLD) with real-world engineering practices — not just theory.

🔹 Layered Architecture (Routes → Controller → Service → Repository)
🔹 Strategy Pattern for flexible short-code generation
🔹 Redis caching for high-performance redirects
🔹 MongoDB for persistence & analytics
🔹 SOLID principles applied in real code

If you’re preparing for backend / system design interviews or want to understand how clean architecture works in practice, this is for you.

📖 Read the full Medium post 👇
👉 https://devdiaryacademy.medium.com/building-a-production-ready-url-shortener-with-node-js-fc0ed5aac54f

☕ If this helped you, support my work:
👉 https://bit.ly/3MnzqlH

Building a Production-Ready URL Shortener with Node.js Low-Level Design (LLD) using SOLID Principles & Design Patterns

Writing code: "Bhai, main toh genius hoon! Ek baar mein code chalega." 😎🚀 Debugging: "Ye semicolon kahan reh gaya? Kyun meri zindagi barbad ho rahi hai?!" 😭💻

Coding start karte waqt lagta hai ki hum hi Bhagwan hain, par 5 minute baad wahi errors 'Error 404' ki tarah dimaag ghumate hain. Tag karo us dost ko jo 10 minute coding karta hai aur 10 ghante debugging! 👇

Let's be real, this is the true backbone of the tech industry. All hail the copy-paste gods! 🙏😂

My code isn't broken, your environment is just "different." 🤷‍♂️☕️

The developer's struggle is real.

Pickling vs Unpickling in Python 🐍
Understanding how Python stores and retrieves objects is essential for file handling, data storage, and networking.
This table clearly explains the difference between serialization (Pickling) and deserialization (Unpickling) in a simple way.

Save this for quick revision 💡

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