Instagram System Design Explained (HLD + LLD) | 7-Step Framework

Описание: Ever wondered how Instagram handles billions of photos? In this video, I use my 7-step framework to design Instagram from scratch, covering both HLD and LLD for SDE-1/2 interviews.

"Design Instagram"—it’s a classic interview question, but most candidates fail because they dive straight into the newsfeed. In this video, I show you the exact system design framework I use to ensure I never go blank in an interview.

We’ll move beyond the basics and look at how a production-level system actually works, including hybrid feed strategies and database sharding.

🚀 What you will learn:
✅ Requirements: Clarifying functional vs. non-functional needs.
✅ Capacity Estimation: Calculating DAU, storage, and throughput.
✅ API Design: Creating RESTful endpoints for posts and follows.
✅ Data Modeling: Choosing between SQL, NoSQL, and Object Storage.
✅ HLD: Building the high-level architecture (Load Balancers, Caching, CDNs).
✅ LLD (The Deep Dive): Fan-out on Write vs. Fan-out on Read for Feed Generation.

Interview Tips: The "Gold Standard" closing line to show confidence.

Timestamps:
0:00 - The Mistake 90% of People Make
0:28 - Step 1: Requirement Clarification
1:24 - Step 2: Metrics & Numbers
2:01 - Step 3: API Design
2:46 - Step 4: Data Model & DB Choices
3:58 - Step 5: High-Level Design (HLD)
6:49 - Step 6: Low-Level Design (LLD)
8:57 - Step 7: Final Review & Summary

#SystemDesign #Instagram #SoftwareEngineering #SDEInterviews #TechInterview #CodingLife #HLD #LLD #NitManTalks

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Nitin Mangotra | Nitman Talks