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Low Level Design (LLD) Coding

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[Uber] Design šŸ¢(LLD) Meeting Scheduler - Machine Coding Interview

Subhahu JainSubhahu Jain
Nov 9, 20251 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 šŸ¢(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

šŸšš Delivery Truck Loading System Concurrency Problem

Subhahu JainSubhahu Jain
Aug 22, 20254 min read

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

šŸšš Delivery Truck Loading System Concurrency Problem

šŸŽ® Online Matchmaking (Real-Time Queue Handling) Concurrency Problem

Subhahu JainSubhahu Jain
Jul 24, 20252 min read

Problem Simulate an online matchmaking system where: Players join a matchmaking queue in real-time. When enough players are available (say, 4 or...

šŸŽ® Online Matchmaking (Real-Time Queue Handling) Concurrency Problem

šŸ“ž Call Center Queue Concurrency Problem

Subhahu JainSubhahu Jain
Jul 19, 20252 min read

šŸŽÆ Objective: Simulate a call center where: There are a limited number of agents (say 3). Many customers (calls) are coming in at the same time. If...

šŸ“ž Call Center Queue Concurrency Problem

šŸ¦ Bank Transaction Concurrency Problem

Subhahu JainSubhahu Jain
Jul 8, 20252 min read

Problem Statement Multiple threads (ATM users, online banking) access shared bank...

šŸ¦ Bank Transaction Concurrency Problem