A practical book for mobile engineers: from messy specs to reusable flows, clean architecture, and interview-ready thinking.
Used by devs at Facebook, NYT, and companies around the world.
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A deep, practical guide to mobile architecture—including flows, scaling up UI, DI, testing, and modular apps.
→ Learn MorePrepare for mobile system design interviews with checklists, reference sheets, and real-world mobile questions.
→ View Free GuideExplore topics like flows, scaling UI, design systems, and architectural decisions in mobile development.
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→ Go to SubstackThese quick videos explore practical ways to think through system design prompts.
→ Watch VideosCheck out the Quick Reference Cheat Sheet. Ideal for interviews and quick lookups.
Included with both the Full Book Bundle. Ideal for prepping and feeling confident during interviews.
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Tjeerd in ’t Veen is a mobile engineer who challenges the way we create mobile applications.
With over 25 years of experience developing features, including roles as a staff engineer at Twitter (now X) and as a mobile tech lead at ING international bank, he possesses expertise in developing mobile applications with scalability, adaptability, and robustness.
Tjeerd is the author of the highly-rated book Swift in Depth.
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