10 Real-World Case Studies for Senior iOS Engineers + 2 Freebies

Series: iOS at Scale

Most iOS books teach you what MVVM is.

This one teaches you how Instagram's feed doesn't jank at 10M scrolls a day, how offline-first chat survives two devices editing the same message, and how a login flow avoids the token-refresh race condition that silently logs real users out.

WHO THIS IS FOR

• You're prepping for a senior/staff iOS interview and keep freezing on "design X" questions
• Your team's codebase has outgrown its original architecture
• You know the patterns (MVVM, DI, Combine, async/await) but not when or why to reach for each
• You're tired of resources that define terms instead of building judgment

iOS at Scale is 10 system design case studies, each written exactly the way a senior or staff-level interview actually goes — not as topic summaries.

Every case study follows the same structure:

• The Problem — a real scenario, framed the way an interviewer would ask it
• Requirements & Constraints — what scale and reliability actually mean here
• Options on the Table — real trade-offs, no false "one right answer"
• The Chosen Design — production-grade Swift, explained where it matters
• What Breaks in Production — a real failure story, not a generic warning
• The Follow-Up Question — what a staff interviewer asks next, and how to answer it

What's inside — 10 case studies & 2 Free Take aways!

1. Design an infinite, jank-free feed
2. Design an offline-first chat app
3. Design a real-time price/status ticker
4. Design a modular app for a 50-engineer team
5. Design a background location pipeline
6. Design a secure login & session system
7. Design a resilient media upload pipeline
8. Design a push notification system that doesn't duplicate
9. Design for a sub-400ms cold start
10. Design an architecture that will outlive its authors

2 FREE Take Aways:

1. Instagram Posts - System Design
2. iOS Release Engineering

What's included in the bundle:

• 📖 10 Full books — PDF's
• ✅ Interview prep checklist
• 🧠 Included Follow-up question bank — the exact staff-level questions from each chapter, for self-testing
• 🔄 Free lifetime updates as new case studies are added
• 📖 2 Free take away PDF's

Future Books in the iOS at Scale Series

📘 System Design (Available Now)

📙 Performance Engineering (Coming Soon)

📕 Swift Concurrency (Coming Soon)

📗 Release Engineering (Coming Soon)

📒 Camera & AVFoundation (Coming Soon)

📓 Architecture Patterns (Coming Soon)

Buy once, and start building your iOS architecture library.