Design (LLD) Paytm/Phone Wallet System - Machine CodingSubhahu JainΒ·Sep 4, 2025Β·4 min readTable of contentsβ Features RequiredSolution approachesπ Design Patterns to Useπ₯ Concurrency Challenges to Handleβ‘ Concurrency Choicesβ‘ Algorithms InvolvedCodeProgramming BlogsJavainterviewLLDinterview questionsC++