Our newsfeed was taking 4 seconds to load a feed. We added a cache. Now it takes 40 milliseconds.Here's what happened.The ProblemWe ran a load test with just 50

This thread is about auto Generating Semantic role based access control middleware  using Metaprogramming.Metaprogramming is code that writes or manipulate

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

Let me walk you through the different variations of the LCA problem and how to solve each one with slight modifications to the core algorithm.1. Basic LCA Probl

Greedy algorithms:The class of algorithms that make locally optimal choices at each step with the hope that these choices will lead to a globally optimal soluti

1. What Are We Talking About?The 132 pattern is a problem where we need to find a subsequence of three numbers in an array (nums[i], nums[j],&nbs

Situation:You are given a sorted array of integers where every element appears exactly twice, except for one element that appears only once.

In the world of computer science and mathematics, some problems are deceptively simple to describe but incredibly challenging to solve.One such problem is the&n

Greedy algorithm only applies to the optimization problem.Greedy algorithm makes the decision at every point choosing the local minimum or maximum depending on

Imagine this: You’re in a coding interview at your dream company. The interviewer slides you a problem about scheduling meetings or merging overlapping interval

If you stack several restricted Boltzmann machine on the top of each other then we form a deep belief networkInput layers -> suplied to 1st RBM -> inputs

In this thread we will see how a single dynamic programming (DP) approach can be adapted to solve multiple seemingly different problems. By understand

A Singleton is a design pattern that ensures a class has only one instance (object) throughout the entire application and provides a global point to access it.L

Bayes' Rule:A fundamental concept in probability theory. It allows us to update our belief about an event based on new evidence.probability of an event A, given

Imagine you're building an app that needs to check if a number exists in a dataset of a million numbers. You have two options:1. 📝 Simple Array Search: &n

Let's first understand why is this question and it's solution significant to us:The Why??Algorithmic Pattern RecognitionIt's a gateway to understanding Dijkstra

Imagine you're building a social network, and you need to create a test environment that perfectly mirrors your production network - every user, every connectio

Here's a standard Boltzmann Machines:image credit:In theory it's a great problem, where reach node is connected to every other node.As we increase the number of

let's say we have a graph:How do we represent this Graph in data structure?Adjacency List:Represent this graph as anarray [ ] This array is going to have the eq

Binary tree, Binary search tree, full and complete binary tree we can combine these ideas together so that we can learn a new assistant data structure which is

Every components starts simple enough, a few fields. Some basic state, clean, straightforward and manageable.But then reality hits.More fields. More validation.

Why Trie Data Structure?Whenever you start typing in modern applications - whether it's a search bar, messaging app, or navigation system, there's likely a Tri

Whenever we are updating the iteration by only 1 count regardless we use for.If we want to update out iteration based certain count depending on the condition.

As a visitor to a Unisala user's signature page, I want to interact with an AI assistant that can intelligently answer questions about the user's professional b

What GPT-3 Means: GPT means generative pre-trained transformer, 3 means 3rd generation.Generative: Means bot that can generate new text.Pre-trained: Pre-trained

This thread revolves around evaluating the technicality of current data storgae methods used in Unisala's platform, specially how drafts are managed. What kind

Over the past few days, I’ve been brainstorming features that combine curiosity with thoughtful questions about how we learn and grow. These questions sparked s

For the longest time, Unisala operated without proper project management tools like jira. This was not only area where we faltered. It was just one of many spin

Lessons from Analytics and Performance ChallengesFor a long period of time analytics was overlooked. This is where we were doomed. I once asked a senior, who is

A type environment (T) maps variables names to theirs types. For example:+ is mapped to the type , Int -> Int -> Int y is mapped to the type Int Lambda E

In type theory, sub typing denoted by (<:) is a relation that describes when one type can be used in place of another type. It's more like flexible version o

Solve each of the following constraints. Let's first understand the tools to solve it:Constraint Solving in type inference involves finding a way to make d

How to solve it?Let's learn.A type environment (T) maps variables names to theirs types. For example:+ is mapped to the type , Int -> Int -> Int y is map

To explain the concepts of soundness and completeness, particularly in the context of type checking and type inference, we can use analogies to make them easier

The Evolution of Unisala: A 4 year journey:The first chapter of the Unisala story began 4 years ago (2020-2021). I was in my senior year of undergraduate, the f

What is Rust?Rust is a system programming language that focuses on speed, memory safety, and parallelism. It was developed by Mozilla and has been gaining popul

Let's look at how memory is managed in multiple languages first.Imagine you're renting bikes from a shop:C/C++: Manual Memory ManagementYou have to manually pi

DNS is internet directory, which translates human readable domain names such as unisala.com to a machine readable ip address. This is the reason why when you ty

What are some real world usage of this tree comparison algorithm?1. Facebook: React's Virtual DOM:In React (built by Facebook), the UI is represented as a tree.

this lecture is from CSCE-550, Nov 12, 2024.The Why?Why understand the lecture on Programming language theory (Subtyping) is important to study ? Today's lectur

How We See Things: The Brain's Pattern Recognition Game?Have you ever looked at clouds and seen shapes in them? Or perhaps you've encountered those fascinating

Why Should You Care About CNNs?Have you ever wondered how your phone recognizes faces in photos? Or how self-driving cars can tell the difference between a pede

The Context Irony:Ever tried finding that beach photo on your phone? You type beach in your photo gallery search.shows Nothing.You try "ocean."Still nothing.Fru

As users generate thousands of images, the real challenge becomes storing, understanding, and retrieving these assets effectively. The goal is to build a "smart

Power of (Python + Keras) modern deep Learning tools:This guide walks through the process of building and training an Artificial Neural Network (ANN) using Tens

Eigenvectors and Eigenvalues:we have :Now, let's say we apply linear transformation:It moves the original vector i^ to the coordinates [3, 0] & j^ to [1, 3]

Focusing on the mathematical foundations of neural network activation functions. We'll start with simple rules Transformations on functions, then explore odd, e

Tensors:Definition:A tensor is a mathematical object that describes linear relations between vectors, scalars & other tensors.They can be thought of multidi

Linear Transformation:A function that takes a vector as input and produces another vector as an output, while preserving vector addition & scalar multiplica

What's a real world application of linear algebra?Almost all of us, have used image resizing.When you resize an image on your phone, you're actually using linea

A user takes a notes on this senior computer science class.When the note is complete and is ready to be published.User enters following topicDefined already in

hey guys, let’s meet up this Sunday, and catch up.we will touch base and have a social session together.Let’s mee this Sunday @8 pm, 👋 greetings 👋 Prashant B

Ways to handle image in application:Directly upload files/images to the server (Naive way)Use external buckets like S3 to put your images/files.To create a scal

Why is this note important?Unsecure Warning: When your site is accessible via http://yourdomain.com without SSL, browsers will display a "Not Secure" warning, w

It's been sometime i have not posted any notes on blind 75 question.

When arriving in the United States, one of the first things you'll want to do is get a local SIM card for your phone. So that you don't get lost 😉If you want t

Reverse bits of a given 32 bits unsigned integer.Note:Note that in some languages, such as Java, there is no unsigned integer type. In this case, both input and

A Quick Guide for International Students Flying to the USA for this Fall. Congratulation for securing spot in a U.S. university! Semester is approaching so many

How we optimised our software loading time by 5x?Unisala was initially written in ionic react. The reason? Ionic is one stop cross platform development framewor

Housing Guide for International Students at Southeastern Louisiana UniversityAs an international student preparing to study at Southeastern Louisiana University

How to renew driving license in Louisiana as an international students on F1.It's a simple process.You will need documents to showValid I20Valid PassportSSNProo

#7 Find Minimum in Rotated Sorted ArrayBlind 75. Array Suppose an array of length n sorted in ascending order is rotated between 1&nbs

In this space of Data science and Algorithm, i will post how we can solve popular blind 75 questions.Mainly why we need to solve this question and the applicati

We've seen how single perceptron behaves, now let's expand on this concept to understand the idea of a neural network.Let's see how to connect many perceptrons

Semantics & Sentiment Analysis:Word2vec:Two layer neural net that processes textInput is a text corpus, & ouput is a set of vectors:feature vectors for

Key Performance Index:What is it? Characteristics of good KPI?KPI is not a goal but it's a measurement of how you achieve your goal.It's used in business all th