Objective The objective of this module is to design and implement a scalable Role-Based Access Control (RBAC) system for enterprise web applications. The architecture enables administrators to define roles, assign permissions, and enforce secure authorization across both frontend and backend services while maintaining flexibility for future role expansion. Requirements Functional… Continue Reading Architecting a Role-Based Access Control System for Enterprise Web Applications

Objective The objective of this module is to design and implement an interactive 3D Avatar Companion viewer within a mobile application. The engine provides users with a fluid interface to discover, download, cache, and interact with live-rendered 3D models (.glb files) while executing structural animations directly on the client view.… Continue Reading Architecting Interactive 3D Companion Avatars: Cache-First UI Implementation and Firebase Storage Integration in Flutter

Introduction Great UI design rarely comes from a single clever idea — it comes from mastering a handful of fundamentals and applying them consistently. Visual hierarchy, color, typography, and white space aren’t separate skills; they work together to guide the user’s eye, communicate meaning, and create interfaces that feel effortless… Continue Reading The Foundations of Good UI Design: Hierarchy, Color, Typography, and Space

Introduction Multi-Factor Authentication (MFA) provides an additional layer of security for your AWS account by requiring both a password and a time-based authentication code during login. Even if an attacker obtains your password, they cannot access your account without the MFA device. Prerequisites Before you begin, ensure you have: Implementation… Continue Reading How to Enable Multi-Factor Authentication (MFA) for an AWS IAM User

Introduction Real-time notification systems have become a key feature of modern web applications, enabling users to receive instant updates without refreshing the page. Whether it’s a new message, task assignment, order status update, or system alert, real-time notifications help improve user engagement, streamline communication, and enhance the overall user experience.… Continue Reading Building a Real-Time Notification System with Node.js, Socket.IO, and React

Introduction When an application running on a Linux server needs to connect to an external service, the system must identify the correct destination and network path before sending the traffic. For example, when a process tries to connect to a domain such as example.com, the domain name is first resolved… Continue Reading How the Linux Kernel Handles Network Connections Using DNS and Routing

Introduction Metabase is a popular open-source business intelligence platform that allows users to connect various databases and create dashboards and reports. While databases are typically added through the Metabase web interface, administrators can automate the process using the Metabase REST API and command-line tools such as curl. This article explains… Continue Reading How to Add a Database to Metabase via CLI Using the REST API

Introduction While setting up Container1 inside an OpenVZ container, I encountered the following error: ls: cannot access /dev/net/tun: No such file or directory This occurs when the TUN/TAP device is not enabled for the container. Since many networking applications rely on /dev/net/tun to create virtual network interfaces, its absence can… Continue Reading Fixing the /dev/net/tun Error in an OpenVZ Container

Introduction In environments where application servers and database servers communicate over a private network, configuring MySQL to listen on a private IP address improves security and reduces exposure to public networks. This approach ensures that database connections are restricted to trusted internal systems while maintaining application connectivity. This guide outlines… Continue Reading Configuring MySQL to Listen on a Private IP Address