Deloitte .NET Interview Experience | Large File Upload System Design

Explore a large file upload system design question from my Deloitte .NET client-round interview experience. We break down how to approach 5GB+ file uploads, massive CSV ingestion, and thousands of concurrent users in an ASP.NET Core application. For .NET developers preparing for senior backend and system design interviews, this walkthrough explains how to move beyond basic controller logic and reason through memory usage, concurrency, and infrastructure protection. In this video, we cover: • Defining “large” by file size, record count, and workload • Streaming vs buffering and their impact on memory usage • Handling large CSV files and massive record sets • Understanding thread pool exhaustion and concurrency bottlenecks • Protecting your service under heavy upload traffic • Explaining architecture decisions and trade-offs in an interview Chapters: 0:00 The Hidden Complexity of File Uploads 1:17 Defining What Large Actually Means 2:58 Handling Massive Record Sets 6:00 Streaming vs Buffering: A Deep Dive 19:21 Strategies for High Concurrency 27:32 Infrastructure Protection and Scaling Continue your interview preparation with this playlist:    • .NET Interview Questions & Real Experience...   What would become the first bottleneck in your application if thousands of users uploaded large files simultaneously? Share your approach in the comments. Subscribe to DotNet Decode for .NET interview experiences, ASP.NET Core explanations, and practical system design discussions. #DotNetInterview #DeloitteInterview #SystemDesign