We cut our API latency by 67% and boosted throughput by 31%. We didn't change a single line of business logic. We didn't upgrade our servers. We fixed one stupi

When a project starts, life is simple. You know how things are wired, and adding a new feature feels effortless. But as the system grows, that mental model coll

First thing first what's difference between Design Principles vs Design Patterns?The Why?Design Principles are broad guidelines or philosophies for writing good

The Situation & Challenge:At Blueflite, drone operations platform serves multiple organizations with straightforward roles:Operators : Plan and execute ope

Many struggle with backtracking because they confuse two fundamental patterns i.e Sequential Decision Making and Choice Generation. The Conversion Funnel: From

🎯 The Real Question: How do I train my brain to see patterns?here's the actual thinking process that happens in senior developers' minds:📖 STEP 1: R

Publish-Subscribe is a messaging pattern where:Publishers send messages without knowing who receives them.Subscribers listen without kn

If you’ve ever built a search bar or input form that sends API calls, you’ve probably heard of debounce. Or maybe you’ve created a backend API then you've proba

A sort that return a specific order of the vertex of a given a graph as long as the graph satisfies certain condition. This is a simple algorithm to learn.First

All communication in distributed systems is based on explicit message exchange (sending and receiving messages).When process P wants to communicate with process

Arrays are where we start as devs. But what if I told you arrays secretly stack superpowers?Let's go beginner → expert: mastering arrays, stacks, monotonic stac

You are given an integer array nums of size n containing each element from 0 to n - 1 (inclusive). Each of the

🧠 Why Learn This?Matrix rotation isn't just a coding interview favorite It's used in AI, ML, and image processing to manipulate data efficiently.Think:Rotating

You are given an integer array nums. The range of a subarray of nums is the difference between the largest and smallest element in the

🔁 Problem Restatement (in simpler terms)You are given:A directed graph with n nodes.Each node i has a color, colors[i] ∈ {a-z}.Each path from one node to anoth

1️⃣ Understanding the ProblemThe Decode String problem asks us to decode a string like 3[a2[c]] into accaccaccFormat: k[encoded_st

The Problem:Given an integer array nums, you need to find one continuous subarray such that if you only sort this subarray in non-decreasing orde

🐇 What is RabbitMQ?In real world systems, services fail, crash, restart, or scale dynamically. You can't afford tight coupling between them. RabbitMQ ensures n

🌍 The Why?Event Timeline Visibility:Think of mountains as tasks, events, or ads that want to be seen. Only those not completely covered by others are visible.U

Chapter 1: The Mysterious SlowdownAlex, a junior engineer at a fast-paced AI startup, was proud of their latest code. It processed massive datasets for a new re

Once upon a time, in a village of coders, there lived a gardener named Prashant. He had two ways of planting flowers in his garden Greedy and Non

🧠 Why Are You Learning This?The minimum-weight arborescence (MWA) problem is a fundamental problem in graph theory with applications in:Network desig