Industry-Specific Patterns
Generic Android best practices apply everywhere. Industry-specific patterns apply only when you're building a fintech / healthcare / e- commerce / gaming app — and they're load-bearing for those verticals. This section covers the architecture, compliance, and design considerations that separate a generic shopping app from a payment- processing app subject to PCI DSS, or a health app subject to HIPAA.
Fintech
Payment processing, PCI DSS, fraud detection, multi-factor auth, transaction integrity, regulatory reporting.
Healthcare
HIPAA compliance, Health Connect, EHR integration, telemedicine, patient privacy, FDA considerations.
E-commerce & Gaming
Cart abandonment, search, recommendations, real-time game state, anti-cheat, virtual goods, leaderboards.
Why industry knowledge matters
A shopping app that takes credit cards is subject to PCI DSS — even if you use Stripe. A fitness app that stores heart rate is subject to HIPAA in the US if marketed to clinicians. A game with in-app purchases crosses virtual-currency regulations in some jurisdictions.
Engineers who understand these constraints command higher salaries — you're not just an Android dev, you're a fintech / health / gaming engineer. And the patterns transfer: once you've worked through PCI, the patterns for GDPR / HIPAA / SOC 2 feel familiar.
How to read this section
Don't try to absorb all three. Pick the vertical that matches your work or interview goals. Each chapter is independent — you don't need the others.
Chapters
- Fintech Patterns — PCI DSS, payment SDK integration, fraud detection, transaction integrity, regulatory compliance
- Healthcare Patterns — HIPAA, Health Connect, EHR/FHIR, telemedicine, patient privacy, BAAs
- E-Commerce & Gaming Patterns — cart, search, recommendations, real-time multiplayer, anti-cheat, in-app purchases
- Real-World Case Studies — technical deep-dives on Cash App, Tinder, Duolingo, Reddit, Spotify, Tally, and Notion