Paramveer

@paramveer504

Learning, Applying, Developing

Joined December 2025

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Understanding WebDevunderstanding-web-dev.hashnode.dev53 posts

Understanding AppDevunderstanding-app-dev.hashnode.dev3 posts

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How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

May 31 · 7 min read · Sending a Message in Airplane Mode Imagine opening WhatsApp, typing a message and pressing send while your phone is in airplane mode. Surprisingly, the message immediately appears inside the conversat

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How Instagram Stores Reels, Photos, and Drafts Behind the Scenes

May 31 · 6 min read · From Recording a Reel to Watching It Again When you record a Reel on a social media application, a surprisingly large number of systems start working behind the scenes. To the user it feels simple: re

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Storing Uploaded Files and Serving Them in Express

May 10 · 5 min read · Once file uploads start working in an Express application the next important step is understanding where those uploaded files actually go and how users can access them later. Many developers initially

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Handling File Uploads in Express with Multer

May 10 · 4 min read · File uploads are extremely common in backend development because many applications need users to upload profile pictures PDFs documents videos or other media files. Initially file uploads feel slightl

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JWT Authentication in Node.js Explained Simply

May 10 · 6 min read · Authentication is one of the most important parts of backend development because servers need some way to identify users after login. Suppose a user logs into a website and then tries to open their da

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Paramveer

About

Available for

Paramveer's blogs

Recently published

How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

How Instagram Stores Reels, Photos, and Drafts Behind the Scenes

Storing Uploaded Files and Serving Them in Express

Handling File Uploads in Express with Multer

JWT Authentication in Node.js Explained Simply

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Paramveer

About

Available for

Paramveer's blogs

Recently published

How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

How Instagram Stores Reels, Photos, and Drafts Behind the Scenes

Storing Uploaded Files and Serving Them in Express

Handling File Uploads in Express with Multer

JWT Authentication in Node.js Explained Simply