Research: Phase 1 complete - Executive summary

- Backend: Axum selected (18% faster, 25% less memory)
- Mobile: React Native selected (70-80% code sharing)
- Web: React selected (code sharing, best charts)
- Platform strategy: Mobile-first with web companion
- Implementation timeline: 22-32 weeks (5.5-8 months)
- Next: State management research (Redux vs Zustand)

thoughts/research/PHASE-1-RESEARCH-COMPLETE.md

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+# Research Phase 1 Complete - Executive Summary
+
+**Date**: 2026-02-14
+**Status**: Phase 1 Complete - Ready for Phase 2
+
+---
+
+## Technology Stack Decisions
+
+### Backend Framework: **Axum 0.7.x** (Rust)
+
+**Key Metrics**:
+- **18% faster** for large encrypted data (9,500 vs 8,000 RPS)
+- **25% less memory** for concurrent connections (1.5KB vs 2KB)
+- **Better streaming** for 10MB+ encrypted responses
+- **Tower ecosystem** for encryption middleware
+
+### Mobile Framework: **React Native 0.73+** (iOS + Android)
+
+**Key Metrics**:
+- **70-80% code sharing** between mobile and web
+- **Excellent health sensor** integration (HealthKit, Health Connect)
+- **Single language** (TypeScript) reduces development cost
+- **QR scanning**, encryption, and background sync
+
+### Web Framework: **React 18+** (Companion)
+
+**Key Metrics**:
+- **70-80% code sharing** with React Native
+- **Best chart ecosystem** (Recharts)
+- **Single language** (TypeScript)
+
+---
+
+## Platform Strategy
+
+### Primary: Mobile Apps (iOS + Android)
+- Daily health tracking and data entry
+- Health sensor integration
+- QR code scanning (lab results)
+- Push notifications (reminders)
+- Background sync
+
+### Secondary: Web Browser
+- Complex data visualization and charts
+- Historical trend analysis
+- Profile and family management
+- Extensive reporting
+
+---
+
+## Implementation Timeline
+
+- **Phase 1: Mobile MVP** (8-12 weeks)
+- **Phase 2: Backend API** (6-8 weeks)
+- **Phase 3: Web Companion** (4-6 weeks)
+- **Phase 4: Polish & Launch** (4-6 weeks)
+
+**Total**: 22-32 weeks (5.5-8 months)
+
+---
+
+## Next Steps
+
+1. **State Management Research** (Redux vs Zustand)
+2. **Authentication Design** (JWT with recovery phrases)
+3. **Database Schema Design** (MongoDB collections)
+4. **Proof-of-Concept** (Health sensor integration)
+
+---
+
+## Research Files
+
+- [Backend Performance Comparison](./2026-02-14-performance-findings.md)
+- [Frontend Mobile Research](./2026-02-14-frontend-mobile-research.md)
+- [Complete Research Summary](./2026-02-14-research-complete-summary.md)
+- [Tech Stack Decisions](./2026-02-14-tech-stack-decision.md)