Category Archives: Uncategorized

Learn System Design for AI Agents: Build a Production-Ready Multi-Agent PR Reviewer

Building a basic AI demo with a single completion prompt and simple RAG pipeline is easy, but taking agentic systems into production requires robust system design, reliability engineering, and failure-mode tolerance. We just posted a comprehensive course on the freeCodeCamp.org YouTube channel that will walk you through designing and implementing a production-grade, multi-agent automated Pull […]

Learn Data Structures and Algorithms Visually

Learning Data Structures and Algorithms (DSA) often feels like facing an challenging wall of complex jargon, syntax, and heavy mathematics. But don’t worry because we just posted a course on the freeCodeCamp.org YouTube channel taught by Sumit Saha that covers foundational computer science concepts using relatable, real-world analogies. You will develop an intuitive mental model […]

How to Build a Browser-Based PDF to Grayscale Converter Using JavaScript

Many PDF documents contain colorful charts, presentations, marketing materials, scanned pages, or graphics that aren’t always ideal for printing or archiving. In some cases, converting a document to grayscale reduces distractions, creates printer-friendly versions, lowers printing costs, or prepares files for black-and-white publishing. A PDF to Grayscale Converter automates this process. Instead of editing every […]

How to Modernize a Legacy Application with AI Without Turning It Into a Rewrite

I have seen legacy migrations considered successful because the old framework disappeared from the repository. Six months later, the team was still dealing with the same coupling, the same unclear business rules, and almost the same deployment problems. The technology had changed but the system hadn’t changed very much as a whole. AI makes this […]

How to Create a Scalable KYC Onboarding Flow in React with Shadcn UI

Every B2B SaaS product with a compliance requirement (like banking, lending, payroll, or crypto) hits the same wall early on: before you can let a business use your platform, you need to verify who they are. That means collecting a business type, pulling in registration documents, and showing the user where their verification stands, all […]

How the Chrome Dino Game Works Under the Hood: A Tour of Chromium’s Source Code

You’ve seen it a hundred times: the Wi-Fi drops, Chrome shrugs, and a little pixelated T-Rex appears, ready to sprint through a desert the moment you hit the spacebar. That tiny game, hidden behind the “No Internet” error since 2014, is played roughly 270 million times every month. Its internal codename at Google was “Project […]

How to Build a Browser-Based PDF Color Inverter Tool Using JavaScript

Reading PDF documents for long periods can become tiring, especially when the document contains bright backgrounds or when you’re working in a low-light environment. In other situations, designers, developers, and print professionals may want to inspect how a document looks with inverted colors or prepare alternative versions for accessibility and review. A PDF Color Inverter […]

CSRF from Scratch: Browser Mechanics, Attacks, and Spring Security Implementation [Full Handbook]

If you’ve ever built a web application or configured Spring Security, you’ve almost certainly encountered Cross-Site Request Forgery (CSRF). In my previous guide, How OAuth 2.0 Works: A Practical Guide for Backend Developers, I briefly touched on the mysterious state parameter and noted that its core purpose is protecting authorization flows against CSRF attacks. At […]