🚀 Code Day 10 – Graph Basics (DFS & BFS Mastery)
Welcome to Day 10 of your coding interview journey. So far, you’ve built strong fundamentals: Today, we…
🚦 Rate Limiting Explained: How Real Systems Protect Their APIs
In modern backend systems, exposing APIs to the internet comes with a serious challenge: 👉 How do…
API Gateway vs Load Balancer vs Reverse Proxy: What’s the Real Difference?
If you’ve worked with modern backend systems, you’ve probably seen these three terms used almost interchangeably: 👉…
🚀 Code Day 9 – Binary Search Trees (BST Mastery)
Welcome to Day 9 of your coding interview journey. Yesterday, we introduced Binary Trees.Today, we take it…
Pub/Sub Architecture Explained with Real Backend Examples
Modern backend systems are no longer simple, linear pipelines. As applications scale, the need for loose coupling,…
⚡ Event-Driven Architecture: The Most Important Concept in Modern Backend Development
If you look at how modern systems are built today, there’s a clear shift: 👉 From request-driven…
🚀 Code Day 8 – Trees (Understanding Hierarchical Data)
Welcome to Day 8 of your coding interview journey. So far, you’ve covered: Today, we step into…
⚙️ Microservices Explained from a Senior Engineer Perspective
Microservices are one of the most overused and misunderstood concepts in software engineering. You’ve probably heard: “We…
🚀 Code Day 7 – Heaps (Top K Problems Made Easy)
Welcome to Day 7 of your coding interview journey. You’ve already built a strong foundation: Today, we…
⚖️ SQL vs NoSQL: How Engineers Actually Choose
One of the most common questions in system design is: “Should we use SQL or NoSQL?” But…