ADevGuide Archives
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Showing 72 posts
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Authentication vs Authorization: What's the Difference?
Series: API and Backend Basics Series
Learn authentication vs authorization with clear API examples, 401 vs 403, sessions, JWTs, and role checks in modern backends.
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What Is Google AI Studio? How to Use It Effectively
Series: AI Engineering & Machine Learning Series
Learn what Google AI Studio is, how it differs from Gemini, and how to use prompts, tools, Build mode, and API keys effectively.
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What Is Google Stitch? How to Use Google's AI UI Tool
Series: AI Engineering & Machine Learning Series
Learn what Google Stitch is, how it turns prompts into UI designs and front-end code, and how to use it effectively for faster prototyping.
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What Is JSON? Why It's Used in APIs
Series: API and Backend Basics Series
Learn what JSON is, how its syntax works, and why APIs use it for fast, language-independent data exchange.
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HTTP Status Codes Explained (200, 404, 500 and More)
Series: API and Backend Basics Series
Learn HTTP status codes with real API examples of 200, 201, 301, 304, 400, 401, 403, 404, 429, 500, and 503.
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Git Cheat Sheet for Developers: Common Commands with Real Examples
Series: DevOps & Developer Tooling Series
Use this Git cheat sheet to learn the most useful Git commands for setup, commits, branches, remotes, undoing mistakes, and daily workflows.
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HTTP Methods Explained: GET vs POST vs PUT vs DELETE
Series: API and Backend Basics Series
Learn HTTP methods with real examples of GET, POST, PUT, PATCH, and DELETE, plus safety, idempotency, caching, and API design rules.
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What Is NemoClaw? How to Use NVIDIA's Secure OpenClaw Stack
Series: AI Engineering & Machine Learning Series
Learn what NVIDIA NemoClaw is, how it secures OpenClaw with OpenShell, and how to install, onboard, monitor, and run a sandboxed AI agent.
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Cursor Skills vs Rules vs Subagents: Complete Guide for AI Development
Series: AI Development Tools
Master Cursor's Skills, Rules, and Subagents. Learn what they are, when to use each, and how they compare for AI-powered coding workflows.
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What Are AI Agent Skills? Claude and Modern Agent Systems
Series: AI Engineering & Machine Learning Series
Learn what AI agent skills are in Claude and modern agent frameworks, how reusable skills work, and how to design secure, production-ready capabilities.
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What Is REST API? Beginner's Guide with Examples
Series: API and Backend Basics Series
Understand what a REST API is, how resources, methods, status codes, and stateless requests work, with practical backend examples.
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How APIs Work: A Simple Guide for Beginners
Series: Internet and Web Foundations Series
Learn how APIs work end to end: requests, responses, authentication, status codes, versioning, and practical backend patterns for beginners.
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What is MCP (Model Context Protocol)? Understanding the Differences
Series: AI Engineering & Machine Learning Series
A comprehensive guide to understanding Model Context Protocol (MCP), how it differs from LLMs, AI agents, APIs, and other similar concepts in the AI ecosystem.
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What is OpenClaw? The Complete Personal AI Assistant Platform Guide
Series: AI Engineering & Machine Learning Series
Learn about OpenClaw, the open-source local-first AI assistant connecting Claude, GPT, and LLMs to WhatsApp, Telegram, Slack, Discord, and more channels.
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Perforce MCP Server: AI-Powered Version Control for AI Agents
Series: DevOps & Developer Tooling Series
Learn how to integrate Perforce with VS Code, Claude, and AI assistants using the MCP Perforce Server. A complete guide to AI-powered version control workflows.
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An Easy Step-By-Step Guide to Changing Server Port in a Spring Boot Application [4 Ways]
Series: Spring Boot Mastery Series
Learn 4 ways to change server port in Spring Boot: application properties, YAML config, command-line arguments, and programmatic setup with code examples.
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Monolith vs Microservices: Pros, Cons, and When to Choose
Series: Internet and Web Foundations Series
Understand monolith vs microservices architecture. Learn pros, cons, real-world examples from Netflix and Amazon, and when to use each approach.
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What Is Sub-Agent in Claude Code? Complete Developer Guide
Series: AI Engineering & Machine Learning Series
Learn what a Claude Code sub agent is, how delegation works, and how to configure tools, model, memory, and permissions for faster coding workflows.
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Application Server vs Web Server: Key Differences Explained
Series: Internet and Web Foundations Series
Understand application server vs web server with clear architecture patterns, Java and .NET examples, and when to use each in production.
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What Is a Web Server? How Nginx and Apache Work
Series: Internet and Web Foundations Series
Learn what a web server is and how Nginx and Apache handle HTTP requests, static files, reverse proxying, and production traffic.
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What Is Client-Server Architecture? Beginner Guide
Series: Internet and Web Foundations Series
Learn client-server architecture with clear request-response flow, tiers, scaling patterns, and practical backend design examples for beginners.
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How the Internet Works: Simple Explanation for Developers
Series: Internet and Web Foundations Series
Learn how the internet works end to end: packets, ISPs, routers, DNS, TCP/TLS, and CDNs, with practical debugging insights for developers.
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What Happens When You Type a URL? Step-by-Step Explained
Series: Internet and Web Foundations Series
Understand what happens when you type a URL: browser parsing, DNS lookup, TCP/TLS handshakes, HTTP flow, rendering, and debugging tips.
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TCP vs UDP Explained Clearly with Real Examples
Series: Internet and Web Foundations Series
Learn TCP vs UDP with real examples, packet flow, reliability trade-offs, and a practical decision framework for backend systems.
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How DNS Works: Complete Beginner Explanation
Series: Internet and Web Foundations Series
Learn how DNS works from browser query to authoritative answer, including records, caching, TTL, and practical troubleshooting steps.
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HTTP vs HTTPS: What's the Difference? (Beginner's Guide)
Series: Internet and Web Foundations Series
Learn HTTP vs HTTPS with clear examples: encryption, TLS certificates, integrity, authentication, SEO impact, performance, and migration best practices.
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What Is Hashing? Why It Matters in Modern Software Architecture
Series: Database Scalability Series
Learn hashing in software architecture: data distribution, cache keys, security, consistency, and performance trade-offs used in real production systems.
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System Design Interview: Notification System CheatSheet
Series: CheatSheets
Use this notification system design interview cheat sheet to remember queue patterns, retries, channel routing, and performance trade-offs.
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System Design Interview: Rate Limiter CheatSheet
Series: CheatSheets
Use this rate limiter system design interview cheat sheet to recall algorithms, Redis patterns, edge cases, and scaling math in minutes.
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System Design Interview: Twitter News Feed CheatSheet
Series: CheatSheets
Prepare faster with a Twitter news feed system design interview cheat sheet covering fan-out choices, feed ranking, caching, and trade-offs.
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System Design Interview: URL Shortener CheatSheet
Series: CheatSheets
Crack the URL shortener system design interview with this cheat sheet on APIs, Base62 keys, storage estimates, caching, and follow-up answers.
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System Design Interview: Ultimate Cheatsheet to Crack Any Round
Series: CheatSheets
Master your next system design interview with this practical cheatsheet covering requirements, architecture, scaling math, trade-offs, security, and follow-ups.
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What is Database Sharding? A Complete Guide with Real-World Examples
Series: Database Scalability Series
Learn what database sharding is, how it scales applications like Instagram, and explore key strategies like horizontal partitioning with real-world examples.
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System Design Interview: Distributed Cache Like Redis/Memcached
Series: System Design Interview Series
Master the distributed cache system design interview. Learn consistent hashing, eviction policies (LRU/LFU), and how to scale like Redis and Memcached.
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System Design Interview: Design a Rate Limiter
Series: System Design Interview Series
Master the rate limiter system design interview. Explore token bucket, leaky bucket algorithms, distributed rate limiting with Redis, and race conditions.
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System Design Interview: Design WhatsApp Chat System
Series: System Design Interview Series
Learn to design a scalable chat system like WhatsApp. Covers real-time messaging, WebSocket, last seen details, and end-to-end encryption.
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System Design Interview: Design Twitter News Feed
Series: System Design Interview Series
Master the Twitter system design interview. Learn fanout patterns, timeline generation, hybrid approach, and scaling for 300M active users.
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System Design Interview: Design a URL Shortener
Series: System Design Interview Series
Master the URL Shortener system design interview. Learn about Base62 encoding, Key Generation Service (KGS), data scale, and handling billions of clicks.
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System Design Interview: Design Instagram Feed
Series: System Design Interview Series
Master the Instagram Feed system design interview. Learn feed generation, fan-out service, pull vs push models, and scaling for millions of users.
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System Design Interview: Basic Notification System (Email & Push)
Series: System Design Interview Series
Master the notification system design interview. Learn how to build scalable email and push notification delivery, handle retries, and optimize for reliability.
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System Design Interview: Collaborative Document Editor Like Google Docs
Series: System Design Interview Series
Master the collaborative document editor system design interview. Learn operational transformation, CRDTs, conflict resolution, and scalability patterns.
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API Rate Limiting: Complete Guide with Spring Boot Implementation
Series: Spring Boot Mastery Series
Learn API rate limiting strategies, algorithms, and implementation using Spring Boot. Discover how companies like Twitter and GitHub protect their APIs.
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XGBoost (eXtreme Gradient Boosting): A Complete Guide for Beginners
Series: AI Engineering & Machine Learning Series
Learn XGBoost, the machine learning algorithm dominating Kaggle competitions. Real-world examples from Netflix, Airbnb, and fraud detection systems.
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Retrieval-Augmented Generation (RAG) for Beginners: A Complete Guide
Series: AI Engineering & Machine Learning Series
Learn what Retrieval-Augmented Generation (RAG) is, how it works, and why it's revolutionizing AI applications in enterprise search and customer support.
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All Spring Annotations ASAP Cheat Sheet [Core+Boot][2023]
Series: CheatSheets
Spring annotation cheat sheet Nowadays, there are so many spring annotations that it could become overwhelming. Spring Framework started out with…
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Demystifying Java Interfaces: A Comprehensive Guide to Code to Interface [2 Examples]
Series: Java Interview & Problem Solving Series
Today we will discuss an important Java concept; Code To Interface. In the vast realm of Java programming, the concept of interfaces stands as a powerful and ve
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Mastering Object-Oriented Design with SOLID Principles in Java
Series: Java Design Patterns Series
Explore the power of SOLID principles in Java for robust and maintainable code. Dive into Single Responsibility, Open/Closed, Liskov Substitution, Interface Seg
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Vertical and Horizontal Database Sharding: A Comprehensive Comparison With Easy Analogy
Series: Database Scalability Series
Today we will discuss “Vertical and Horizontal Database Sharding”. In the realm of database management, scalability and performance are often of par
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Spring Boot @Valid vs @Validated: An Easy In-Depth Comparison
Series: Spring Boot Mastery Series
Today we will be talking about “Spring Boot @Valid vs @Validated”. When it comes to building web applications, it’s essential to handle input
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Abstract Factory Design Pattern Java Real World Example
Series: Java Design Patterns Series
Abstract Factory Design Pattern Abstract Factory Design Pattern is one of the Creational pattern and almost similar to Factory Method Pattern except because it’
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16 Java String Wrapper Class Quiz Important Questions [MCQ]
Series: Java Interview & Problem Solving Series
16 Java String Wrapper Class Quiz Important Questions Multiple Choice Hello learners, we have created a Java String Wrapper Class Quiz MCQ to help you…
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20 Java Regular Expressions Quiz Regex Important Questions [MCQ]
Series: Java Interview & Problem Solving Series
Java Regular Expressions Quiz Regex Questions We have brought some Java Regular Expressions Quiz Regex Questions to test your Regex Knowledge. If you need to
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Robot Return to Origin – LeetCode Simple Java Solution
Series: Java Interview & Problem Solving Series
Today we will be solving the Leetcode question “Robot Return to Origin” from the easy category. Problem Statement There is a robot starting at position…
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Reverse Words in a String III - LeetCode Java 8 Solution
Series: Java Interview & Problem Solving Series
Today we will be solving the Leetcode question “Reverse Words in a String III” from the easy category. Problem Statement Given a string s, reverse the…
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Merge Strings Alternately - Leetcode Java Solution
Series: Java Interview & Problem Solving Series
Today we will be solving the Leetcode question “Merge Strings Alternately” from the easy category. Problem Statement You are given two strings word1 and word2.
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Kids With the Greatest Number of Candies - Leetcode Java Solution
Series: Java Interview & Problem Solving Series
Today we will be solving the Leetcode question “Kids With the Greatest Number of Candies” from the easy category. Problem Statement Given the array
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Tomcat vs JBoss - Ultimate Comparison of Java App Servers [2021]
Series: Java Interview & Problem Solving Series
Tomcat vs JBoss – Ultimate Comparison Tomcat, as well as JBoss, seem to be two of the world’s most successful applications or web servers. They̷
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13 Most Basic Docker Commands Every Developer Should Know
Series: DevOps & Developer Tooling Series
In 2020, every developer is expected to know at least some of the Most Basic Docker Commands. Developers should know how to write a dockerfile and must be able
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Simple Guide To Dockerize Java Application Maven With Dockerfile [2020]
Series: DevOps & Developer Tooling Series
How To Dockerize Java Application Maven with Dockerfile Dockerize Java Application Maven: In this tutorial, we will dockerize a basic Java maven(quickstart) app
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Most Important Spring Boot Interview Questions [2020]
Series: Spring Boot Mastery Series
Spring Boot Interview Questions: Spring has become undoubtedly the most famous framework among Java developers. Spring comes with a lot of configurations and to
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Reverse An Integer In Java 8 - Simple Code Example
Series: Java Interview & Problem Solving Series
Reverse An Integer In Java Reverse an Integer in Java is a part of our Java code examples series. This is a very common question…
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Builder Design Pattern Java Real World Example
Series: Java Design Patterns Series
Builder Design Pattern The Builder Design Pattern is a classic Gang of Four creational design pattern. Unlike Pattern Design pattern, the Builder Design Pattern
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21 Basic Linux Commands Every Developer Must Know [2019]
Series: DevOps & Developer Tooling Series
Most Useful Linux Commands For Developer Cheat Sheet Included Basic Linux Commands: In 2019, it doesn’t matter which language you choose for development,
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Composite Design Pattern Java Code Case Study
Series: Java Design Patterns Series
Composite Design Pattern Composite Design Pattern is a Structural Design Pattern that comes in the picture when we have a part-whole relationship. Part-whole re
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Singleton Creational Design Pattern Java Explained [6 Code Example]
Series: Java Design Patterns Series
Singleton Creational Design Pattern Singleton Creational Design Pattern is a part of the classic Gang Of Four Creational Design Patterns. These deal with the cr
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How is Java Pass by Value and Not by Reference [4 Examples]
Series: Java Interview & Problem Solving Series
Java Pass by Value and Not by Reference There is a common confusion in Java Developers especially who have worked with C/C++, whether Java is…
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All About Java Regular Expressions Regex 2019
Series: Java Interview & Problem Solving Series
Regular Expression i.e Regex is common in every predominant programming language, let it be JavaScript, Python or PHP. A regular expression, regex or regexp is&
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Top 40 Agile Scrum Popular Interview Questions
Series: Agile & Software Engineering Career Series
Agile Scrum Interview Questions Agile Scrum is the best methodology to meet today’s demand for accurate projects. Agile is used in almost the majority of…
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Adapter Design Pattern Java Real World Example [2 Implementations]
Series: Java Design Patterns Series
Adapter Design Pattern Adapter design pattern is one of the classic Gang of Four structural design patterns. As the name suggests, we use Adapter Design pattern
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Factory Method Design Pattern Java Simple Detailed Examples
Series: Java Design Patterns Series
Factory Method Design Pattern Java Factory Method design pattern also known as “Virtual Constructor” is a part of Gang of Four Creational Design Pat
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Factory Design Pattern Java Simplified [Simple Real World Example]
Series: Java Design Patterns Series
Factory Design Pattern Java Factory Design Pattern is one of the most used design pattern in Modern System Development. In Factory Design Pattern, Whenever clie
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Prototype Design Pattern Java Real World Example
Series: Java Design Patterns Series
Prototype Design Pattern Prototype Design Pattern is one of the classic Gang of Four Creational Design pattern. Prototype Design pattern is used when the Object