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LLDCoding - Master LLD and Concurrency

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📘 Why Indexes Are Not Free

Subhahu JainSubhahu Jain
Jan 18, 20263 min read

The Silent Cost Behind Fast Reads Indexes don’t make systems faster —they shift cost from reads to writes, memory, and latency tails. 🧠 The...

📘 Why Indexes Are Not Free

Design (LLD) NGROK Tool - Machine Coding

Subhahu JainSubhahu Jain
Aug 11, 20248 min read

Features Required: Port Forwarding: Allows exposing a local server behind a NAT or firewall to the internet. Supports both HTTP and TCP...

Design (LLD) NGROK Tool - Machine Coding

Design Google Calendar - Database Model

Subhahu JainSubhahu Jain
May 18, 20245 min read

Features Included User Authentication: Secure login and registration. Event Management: Creating, updating, and deleting events. Recurring Events:...

Design Google Calendar - Database Model

Design (LLD) Google Authenticator - Machine Coding

Subhahu JainSubhahu Jain
Jan 5, 20247 min read

Features Required: QR Code Generation: Ability to generate QR codes for two-factor authentication. Token Generation: Generate time-based tokens for...

Design (LLD) Google Authenticator - Machine Coding

Design (LLD) Alexa - Machine Coding

Subhahu JainSubhahu Jain
Jan 4, 20248 min read

Features Required: Voice Recognition: Alexa should be able to recognize and interpret voice commands. Natural Language Processing...

Design (LLD) Alexa - Machine Coding

Design (LLD) Chess - Machine Coding Interview

Subhahu JainSubhahu Jain
May 13, 20226 min read

Chess Chess is a two-player strategy board game played on a chessboard, which is a checkered gameboard with 64 squares arranged in an 8×8 grid. There...

Design (LLD) Chess - Machine Coding Interview