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LLDCoding - Master LLD and Concurrency

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Designing a Like / Reaction System (Facebook / LinkedIn) - Database Modelling

Subhahu JainSubhahu Jain
Jan 19, 20264 min read

Modern platforms (Reddit, LinkedIn, YouTube) support multiple reaction types per entity. Core Requirements ✅ One user → one reaction per entity ✅...

Designing a Like / Reaction System (Facebook / LinkedIn) - Database Modelling

📘 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

🎤 Live Podcast with Guests — Concurrency Problem

Subhahu JainSubhahu Jain
Jan 17, 20264 min read

🧠 Real-World Scenario You’re building a live podcast platform where: A host starts a live podcast session. Multiple guests are invited to...

🎤 Live Podcast with Guests — Concurrency Problem

[Uber] Design 🏢(LLD) Meeting Scheduler - Machine Coding Interview

Subhahu JainSubhahu Jain
Nov 9, 20254 min read

We are designing a meeting scheduler with the following requirements: There are N rooms. We are given a stream of meeting requests (start time, end...

[Uber] Design 🏢(LLD) Meeting Scheduler - Machine Coding Interview

Design (LLD) Paytm/Phone Wallet System - Machine Coding

Subhahu JainSubhahu Jain
Sep 4, 20254 min read

Asked in Phonepe interview. Design and implement a Paytm/PhonePe Wallet System that supports multiple concurrent users performing transactions at the...

Design (LLD) Paytm/Phone Wallet System - Machine Coding

🚚 Delivery Truck Loading System Concurrency Problem

Subhahu JainSubhahu Jain
Aug 22, 20254 min read

📝 Problem Setup A logistics company has multiple loading docks where workers load packages into delivery trucks. Each truck has a weight/volume...

🚚 Delivery Truck Loading System Concurrency Problem