Contact person: Business Client

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Location: Lahore, Pakistan

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"Need a Flutter Developer (mobile-first).
Must have experience with 3rd party API integrations + JSON data handling.

Bonus: Worked with Fitbit/Oura/Garmin APIs.

Platform Overview

A mobile-only, web-based health analytics app (no native iOS/Android apps) that converts lab results and wearable data into a personalized Health Score with trend tracking and AI-generated insights.

Patients will:
• Upload their lab reports.
• Connect wearables via the Terra aggregator.
• See a daily-updated Health Score (including sleep).
• Receive AI-generated summaries and 90-day health plans.
• View progress by day, week, month, and year.

Core Functional Features

Mobile-Only Access
• Detect desktop browsers → show QR code prompt to open on mobile.
• Mobile web flow for all steps: registration, payment, device linking, viewing results.
• Responsive vertical layout; no horizontal scroll.

Lab Upload & Extraction
• Users upload PDF lab reports directly from mobile.
• OCR engine (Google Document AI or Textract) extracts lab values into JSON.
• Parse key metrics:
• A1c, Glucose, LDL, HDL, Triglycerides, Vitamin D, hs-CRP, TSH, Hematocrit.
• Store values in structured form (lab_sets table).

Health Score Engine
• Calculates a composite score (0–100) with 5 sub-scores:
• Metabolic (30%)
• Cardiovascular (30%)
• Inflammation (10%)
• Hormone/Micronutrients (10%)
• Lifestyle (20%)
• Scoring thresholds editable via JSON config.
• Sleep metrics from Terra are mandatory in Lifestyle sub-score.
• Includes optional Styku adjustment (±5 points based on BF% trend).
• Updates daily at 5 AM local time (cron job).

Lifestyle Data Integration (via Terra)
• Terra is the only aggregator.
• Supports Fitbit, Oura, Garmin, Withings, Polar, and others via single mobile web connect.
• User completes Terra’s hosted web flow to authorize.
• Daily webhooks or scheduled pulls fetch:
• Steps
• Active minutes
• Resting heart rate
• HRV (RMSSD or similar)
• Sleep duration and efficiency
• Calories burned
• Weight and body fat %
• Store raw data → resample to daily/weekly/monthly aggregates.
• Pull data every 24h automatically (cron/scheduler).

Trends & Visualizations
• Daily, weekly, monthly, and yearly trend charts for:
• Steps, HR, HRV, Sleep, Calories, Weight, Body Fat %, Labs.
• Charts show absolute values + 7-day moving averages.
• Comparative arrows (↑/↓ vs last period).
• Sleep and HRV data visually emphasized in daily dashboard.

AI Summary & 90-Day Plan
• Use OpenAI GPT-4o to generate:
• Easy-to-read summary of lab + lifestyle results.
• Personalized 90-day plan (nutrition + exercise + lifestyle).
• AI prompt includes metrics only (no PHI).
• Plan respects user preferences (exercise or food restrictions).

Preferences & Customization
• User-selectable limitations:
• Exercise: e.g., “No running,” “Low time,” “Knee pain.”
• Food: e.g., “No dairy,” “Low-FODMAP,” “Gluten-free.”
• Stored in preferences table; filters AI recommendations.
• Toggle to “Include Styku in Health Score.”

Payments & Access
• Stripe Checkout for:
• Subscription (monthly).
• One-time purchase (per lab upload).
• Magic-link or SMS code for login (no passwords).
• Stripe customer ID tied to anonymous user ID.

Reports & Downloads
• Generate 1-page PDF report (score, sub-scores, key trends, AI summary).
• PDF view optimized for mobile and printable format." (client-provided description)