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[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

Multi-Threaded Parentheses Validator

Subhahu JainSubhahu Jain
Sep 20, 20253 min read

Problem: Parallel Parentheses Validator Description You are given a string s of length N consisting only of the characters '(' and ')'. A parentheses...

Multi-Threaded Parentheses Validator

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

🧩 Jigsaw Puzzle Builder (Parallel Parts) Concurrency Problem

Subhahu JainSubhahu Jain
Aug 9, 20251 min read

🧩 The Problem We’re building a digital jigsaw puzzle game (or simulation) where: The puzzle has many pieces (hundreds or thousands). Each piece can...

🧩 Jigsaw Puzzle Builder (Parallel Parts) Concurrency Problem

Design (LLD) Internet Download Manager like IDM - Machine Coding Interview

Subhahu JainSubhahu Jain
Jan 14, 20251 min read

Feature Requirements Download File: The system should support downloading a file from a given URL using HTTP/HTTPS protocols. Segmented Downloading:...

Design (LLD) Internet Download Manager like IDM - Machine Coding Interview