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Design Mobile API: Mobile System Design Interview #systemdesign #apidesign

🚀 A significant part of a mobile system design interview is designing the API contract and the interaction between the mobile application and the server, since almost all modern apps rely on online connectivity.

📲 In this video, we cover everything you need to know to design mobile-friendly, scalable, and testable APIs:

✅ REST vs GraphQL vs WebSockets — when to use each
✅ Cursor-based pagination vs offset vs page number
✅ Delta updates: sync smarter, not harder
✅ Real-time updates via SSE or push
✅ Tight coupling, schema versioning, feature flags
✅ Tools: Retrofit, Apollo, SSE, FastAPI, gRPC
✅ Contract design patterns from messaging and feed apps

🧠 These are the core topics interviewers want to hear when you’re asked to design a news feed, messaging app, or any interactive mobile interface.

📦 Includes real JSON API contract examples, trade-offs, and best practices — so you can explain every design decision with clarity.

🎯 After watching this, you’ll be able to confidently speak about:

Which protocol to choose and why

How to structure your API

How to scale with delta sync and caching

How to impress interviewers with practical, scalable answers

⏱️ Time Stamps:
00:00 Intro
01:12 Designing the API
03:22 Why it’s important
04:10 Communication Protocols
09:08 Use Cases & Requirements
10:43 API Structure
17:37 Tooling and Frameworks
19:52 Versioning Your APIs
21:44 Pagination
24:01 Delta Updates
26:49 Common Mistakes
30:02 Messaging App API
34:14 News Feed or E-commerce App API
37:51 Push Notification Payload
40:36 Thank You

Видео Design Mobile API: Mobile System Design Interview #systemdesign #apidesign канала Alexey Glukharev: Software Engineering & IT Career
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