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đ Struggling with Big Tech interview prep? Book a 1-on-1 mentorship session to master mobile system design, coding, and behavioral rounds, with realistic mock interviews and actionable feedback from an ex-Meta engineer. đ https://andrey-tech.com Learn how to design a File Downloader library for iOS and Android. We cover resumable downloads, background support, download progress callbacks, concurrent file downloads, and memory-efficient streaming. Perfect for mobile engineers preparing for system design interviews. Chapters: 0:00 Intro 0:25 Functional Requirements 1:44 How to Design a Library? 2:17 Non-Functional Requirements 3:32 High-Level Architecture Overview 12:12 How Resumable Downloads Work 14:27 Step-by-Step Download Flow 16:45 Handling Background Downloads
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