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Low Level Design (LLD) Coding

Low Level Design (LLD) Coding

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

Subhahu Jain

Sep 4, 2025 4 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 Jain

Aug 22, 2025 4 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

🎮 Online Matchmaking (Real-Time Queue Handling) Concurrency Problem

Subhahu Jain

Jul 24, 2025 2 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...

🎮 Online Matchmaking (Real-Time Queue Handling) Concurrency Problem

📞 Call Center Queue Concurrency Problem

Subhahu Jain

Jul 19, 2025 2 min read

🎯 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...

📞 Call Center Queue Concurrency Problem

🏦 Bank Transaction Concurrency Problem

Subhahu Jain

Jul 8, 2025 2 min read

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

🏦 Bank Transaction Concurrency Problem

Design (LLD) Coupon System For Zepto - Machine Coding Interview

Subhahu Jain

Dec 18, 2024 3 min read

Asked in LLD Interview for SDE-2 Problem Statement: Design a Coupon Recommendation System for Zepto that fulfills the following requirements: Key...

Design (LLD) Coupon System For Zepto - Machine Coding Interview