The Deloitte Client Round System Design Question Most Developers Fail

The Deloitte Client Round system design question about large file uploads is one that most developers answer completely wrong. In this video, we break down how to design a scalable Large File Upload System — the way interviewers expect during a system design interview. Most developers immediately jump into ASP.NET controller code like: • IFormFile • Increasing request size • Uploading to blob storage But that’s NOT what the interviewer is testing. The real challenge is system design thinking. In this video we cover: • Streaming vs buffering architecture • Handling 5GB+ uploads • CSV ingestion with 1M+ records • Preventing thread pool exhaustion • High concurrency upload strategies • Message queue based processing • Scalable cloud storage patterns • Production-grade upload pipeline design This is the type of architecture discussion expected in a Deloitte client round system design interview. ⏱ TIMESTAMPS 00:00 Interview Question: Large File Upload in Web API 00:40 Why Interviewers Ask This Question 02:10 What “Large” Really Means 03:20 Handling 5GB Uploads 07:30 Streaming vs Buffering Explained 15:00 Handling CSV Files with 1M+ Rows 23:00 Async Processing with Message Queue 27:00 Thread Pool Starvation Explained 30:20 Rate Limiting & Infrastructure Protection 32:20 End-to-End Architecture 🚀 What You'll Learn ✔ Streaming vs buffering in ASP.NET Core ✔ Designing scalable upload pipelines ✔ Handling massive CSV ingestion ✔ Preventing thread pool exhaustion ✔ Rate limiting strategies ✔ Production-scale architecture patterns If you're preparing for backend system design interviews or Deloitte client rounds, this video shows the thinking interviewers expect. Subscribe for advanced .NET backend interview preparation.