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UNLOCKED CODING

@Unlocked_Coding is a dedicated channel for Coding & Pemrograman with regular updates in Coding & Pemrograman

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UNLOCKED CODING

12 Mei 2026, 00.29

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💾 AWS S3: Store, Secure, and Scale Your Data
AWS S3 (Simple Storage Service) lets you store and retrieve any amount of data from anywhere on the web.
Think of it as your infinite, reliable hard drive in the cloud.
🛠 Basic S3 Workflow
1️⃣ Create a bucket in the AWS console
2️⃣ Upload your files or website build
3️⃣ Set permissions (public/private)
4️⃣ Access via the file’s object URL or API
🌍 Where AWS S3 Shines
Static website hosting
Data backups and archiving
App file storage (images, videos, logs)
Integration with CloudFront for CDN delivery.

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UNLOCKED CODING

12 Mei 2026, 00.29

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⚡ 1. SSR (Server-Side Rendering)
How it works: Page is generated on every request at the server.
Best for: Dynamic data that changes frequently.
✅ SEO-friendly
❌ Slower than static because server work happens on each request
📦 2. SSG (Static Site Generation)
How it works: Page is built once at build time and reused for all visitors.
Best for: Blogs, docs.
✅ Fastest load (CDN cached)
❌ Needs a rebuild to update data
🔄 3. ISR (Incremental Static Regeneration)
How it works: Pages are statically generated but can be revalidated in the background after a set time.
Best for: News, product catalogs, content that updates occasionally.
✅ Static + fresh content
❌ Delay before updated data appears
💻 4. CSR (Client-Side Rendering)
How it works: Page loads first, then fetches data in the browser using hooks like useEffect.
Best for: User dashboards, data only needed after page load.
✅ Dynamic, no server rebuild needed
❌ Not SEO-friendly (data loads after page render)

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UNLOCKED CODING

12 Mei 2026, 00.29

Docker is a platform that allows developers to build, run, and ship applications inside containers.
Think of containers as lightweight, portable boxes that contain everything your app needs—code, libraries, system tools, and settings.
🔑 Why Docker?
⚡ Consistency → Runs the same everywhere (dev, test, production).
📦 Lightweight → Containers share the host OS kernel (faster than VMs).
🔄 Portability → Deploy apps across different machines/clouds without issues.
🔐 Isolation → Each container runs independently, avoiding conflicts.
🚀 Scalability → Spin up/down containers quickly for microservices & scaling.
🛠 Basic Docker Workflow
1. Write your app code.
2. Create a Dockerfile (instructions for your app image).
3. Build an image → docker build
4. Run a container → docker run
🌍 Where Docker is Used?
Microservices architecture
DevOps & CI/CD pipelines
Cloud deployments (AWS, GCP, Azure)
Local development environments
Learn Docker - https://youtu.be/3c-iBn73dDE

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UNLOCKED CODING

12 Mei 2026, 00.29

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🚢 Kubernetes: The Container Orchestrator

Kubernetes (K8s) is like the captain of a ship, managing all your containers (apps) so they run smoothly.

✨ Why use it?
⚙️ Automated Deployment → No need to start apps manually
🔄 Self-Healing → If a container crashes, K8s restarts it
📦 Scaling Made Easy → Add/remove containers when traffic changes
🌍 Runs Anywhere → Cloud, on-premises, or hybrid setups
🔒 Load Balancing & Security → Distributes traffic safely

💡 With Kubernetes, you focus on building apps, while it takes care of running them at scale.

LEARN FROM - https://youtube.com/playlist?list=PLy7NrYWoggjziYQIDorlXjTvvwweTYoNC

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UNLOCKED CODING

12 Mei 2026, 00.29

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🔧 What is DNS?
DNS (Domain Name System) translates website names (like http://youtube.com/) into IP addresses so your browser can load them.
🚫 How AdGuard DNS Blocks Ads
When you set your device or router to use AdGuard DNS, here's what happens behind the scenes:
1. You visit a website → e.g., a news site.
2. The site tries to load ads from domains like http://ads.doubleclick.net/.
3. Your device sends a DNS request to resolve the ad domain.
4. AdGuard DNS intercepts this request and checks it against its blocklist.
5. If the domain is an ad/tracker/malware → ❌ Blocked (returns a blank or fake IP).
6. The ad never loads → ✔️ Ad removed before it even starts loading.
AdGuard DNS blocks ads system-wide — including in Hotstar, MX Player, TeraBox, games, etc. ✅
But for link shorteners or some websites, you may need to temporarily turn it off to avoid issues loading the page. ⚠️
dns.adguard.com

UNLOCKED CODING

12 Mei 2026, 00.29

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⚙️ Multi-Tenant Architecture
A single codebase serves multiple clients (tenants) with data isolation 🔒
🧱 Tenant Models:
1. Shared DB + Shared Schema (tenant_id)
2. Shared DB + Separate Schemas
3. Separate DB per tenant.
🏢 CRM SaaS App →
Company A & B use the same app, different users/data, same infra
📦 Key Modules to Build:
🔹 Tenant onboarding & schema isolation
🔹 Role-based auth (RBAC)
🔹 Per-tenant configs & theming
🔹 Tenant billing & usage tracking
🔹 Superadmin dashboard
🔹 Secure API access
🔹 DevOps: CI/CD + Docker + DB migration
🎯 Used in: LMS, HRMS, CRM, CMS, internal tools, etc.

103,000

UNLOCKED CODING

12 Mei 2026, 00.29

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TOP JAVA PROJECTS WITH CODE 🐺
1. Online Survey System
✍️ GitHub: https://github.com/kodekracker/Online-Survey-System
2. Online Resume Builder
🫰 GitHub: https://github.com/meetakbari/CV-Resume-Builder
3. Snake Game using Java
🐍 GitHub: https://github.com/janbodnar/Java-Snake-Game
4. Data Visualization Software
🏝 GitHub: https://github.com/gavalian/groot
5. Electricity Billing System
⚡️ GitHub: https://github.com/Adarsh9616/Electricity_Billing_System
6. Web Medical Management System
👁 GitHub: https://github.com/mokarrom/medical-center
7. Supply Chain Management System
☀️ GitHub: https://github.com/sonnyhcl/Backend
8. Exam Seating Arrangement System
👻 GitHub: https://github.com/chabedalam11/Exam-Seating-Arrangement-System-Using-JSP-Servlet
Core Java Projects with Source Code❗️
9. Consumer Relationship Management System (CRM)
👥 GitHub: https://github.com/machowina/CRM
10. bFit: Cognitive & Memory Testing Game
🧠 GitHub: https://github.com/Dk35840/bFit-A-Cognitive-Game
11. Network Packet Sniffer & Analyzer
🖥 GitHub: https://github.com/HassanAdamm/packet-sniffer
12. Internet Service Provider Automation System
🌎 GitHub: https://github.com/nitishr7/ISP-Java
13. Criminal Face Detection System
💀GitHub: https://github.com/prasadus92/Face-Recognition
JAVA PROJECTS 😉

UNLOCKED CODING

12 Mei 2026, 00.29

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Future-Proof Roles in Tech:
1. AI & Machine Learning Engineer
Builds models for analytics, automation, and decision-making.
Skills: Python, TensorFlow, PyTorch, machine learning.
2. Cloud Architect & Engineer
Designs scalable, secure cloud environments.
Skills: AWS, Azure, GCP, Docker, Kubernetes.
3. Cybersecurity Specialist
Protects digital assets from cyber threats.
Skills: Network security, ethical hacking, encryption.
4. Data Scientist & Engineer
Analyzes datasets; builds data infrastructure.
Skills: SQL, Python, big data (Hadoop, Spark).
5. DevOps Engineer
Automates deployments and scaling.
Skills: CI/CD, Docker, cloud platforms.
6. Full-Stack Developer
Builds frontend and backend applications.
Skills: JavaScript, Node.js, React/Next.js, databases.
7. Blockchain Developer
Builds dApps and smart contracts.
Skills: Solidity, Ethereum, cryptography.
IMP NOTE :
PROOF OF WORK + LIVE PROJECTS + USE AI + GRIND HARDER 💪🏼

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UNLOCKED CODING

12 Mei 2026, 00.29

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MOST LAYOFF IN TECH FIELD JOBS LIST
Frontend Developers: Reduced due to rise of full-stack roles and low/no-code platforms.
Backend Developers: Traditional roles consolidated with DevOps, cloud-native, serverless, and microservices.
QA Engineers: Impacted by CI/CD pipelines, automated testing, and shift-left testing practices.
Legacy Tech Stack Engineers: Layoffs as companies modernize from PHP, . NET, COBOL, etc.
IMP NOTE :-
JUST DOING REACTJS OR NODEJS WON'T GIVE U A JOB.
DSA IS STILL REVENANT IN HIRRING
INTERSHIP & OPEN SOURCE CONTRIBUTION IS IMPORTANT PART

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UNLOCKED CODING

12 Mei 2026, 00.29

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DSA SHEETS (Ranked)
---------
1. https://takeuforward.org/strivers-a2z-dsa-course/strivers-a2z-dsa-course-sheet-2/
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2. https://drive.google.com/file/d/1FMdN_OCfOI0iAeDlqswCiC2DZzD4nPsb/view
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3. https://neetcode.io/practice
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4. https://docs.google.com/spreadsheets/u/0/d/1-wKcV99KtO91dXdPkwmXGTdtyxAfk1mbPXQg81R9sFE/htmlview
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5. https://docs.google.com/spreadsheets/u/0/d/1hXserPuxVoWMG9Hs7y8wVdRCJTcj3xMBAEYUOXQ5Xag/htmlview
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UNLOCKED CODING

30 Mar 2026, 10.09

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Authentication (No Backend Needed)
Firebase Auth – Simple authentication.
Clerk – Modern auth for React & Next.js.
Auth0 – Secure JWT & OAuth authentication.
Serverless Backend (API & Functions)
Vercel Functions – Deploy API routes without a backend.
Netlify Functions – Serverless API with Node.js.
Cloudflare Workers – Ultra-fast serverless functions.
AWS Lambda (via SST) – Scalable serverless APIs.

Database Hosting (MongoDB, PostgreSQL, MySQL, etc.)
1. MongoDB Atlas – Free NoSQL database for small projects.
2. Neon – Free PostgreSQL hosting with autoscaling.
3. Supabase – Open-source Firebase alternative (PostgreSQL-based)

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UNLOCKED CODING

30 Mar 2026, 10.09

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HOSTING
Frontend Hosting (React, Vue, HTML/CSS, etc.)
Vercel – Ideal for React & Next.js apps, free custom domain.
Netlify – Best for static sites & frontend frameworks like React, Vue, and Angular.
GitHub Pages – Perfect for static websites, but no backend support.
Cloudflare Pages – Similar to Netlify, offers a fast global CDN
Backend Hosting (Node.js, Express, Django, Flask, etc.)
Railway – Free-tier with generous limits, great for Node.js/Express apps.
Render – Free hosting for backend services (Node.js, Python, etc.), supports databases.
http://Fly.io/ – Good for small-scale Docker-based deployments.
Replit – Cloud-based coding and hosting environment.

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