The secret architecture behind "username already taken"

When you try to sign up on a platform like Instagram and type in your username, the system almost instantly tells you whether it’s available or not. If…

Oct 1 • 

Ashish Pratap Singh

244

15

September 2025

How Indexing Works in Distributed Databases

In a single-node database, indexing is relatively simple.

Sep 28 • 

Ashish Pratap Singh

113

4

Clean Code Tips I Learned from Senior Engineers

Being good at coding and writing good code are two different skills.

Sep 17 • 

Ashish Pratap Singh

133

4

How DNS Actually Works

When you type a website address into your browser, something almost magical happens.

Sep 11 • 

Ashish Pratap Singh

145

10

What are Server-Sent Events (SSE)?

Imagine you’re watching a stock market dashboard. Prices keep changing every second, sometimes multiple times in a second.

Sep 7 • 

Ashish Pratap Singh

61

4

Client-Server Architecture Explained

Every time you're browsing your favorite website, streaming a show, or sending an email, you’re interacting with a system designed around the…

Sep 3 • 

Ashish Pratap Singh

108

August 2025

The 10 BIG Questions of System Design

System design is often misunderstood as a simple exercise of sketching boxes and arrows on a whiteboard.

Aug 31 • 

Ashish Pratap Singh

83

1

From Zero to 30+ Open Source Contributions

A Guide to Jumpstart Your Journey

Aug 26 • 

Ashish Pratap Singh

 and 

Ritankar Saha

75

1

I Created the most Comprehensive LLD Interview Resource

I’m excited to launch my premium Low-Level Design interview resource, which I’ve been working on for the past 4 months.

Aug 21 • 

Ashish Pratap Singh

40

1

July 2025

What is GeoHashing?

Imagine you’re building a system like Uber, Google Maps, or a nearby restaurant finder.

Jul 30 • 

Ashish Pratap Singh

123

6

Load Balancer vs Reverse Proxy vs API Gateway

In modern backend architecture, the terms Load Balancer, API Gateway, and Reverse Proxy often come into play.

Jul 18 • 

Ashish Pratap Singh

189

7

File Storage vs Object Storage vs Block Storage

When it comes to storing large unstructured data like images, documents, videos, there are three popular storage solutions:

Jul 9 • 

Ashish Pratap Singh

130

4