Use Case #31: Full-Stack Feature

"We need appointment reminders. Email 24 hours before, SMS 2 hours before. Track if they confirmed."

That's a full-stack feature: database, backend, workers, notifications, and UI.

The Scope

Database - Tables for reminder schedules, delivery status, user preferences.

Backend - API endpoints for scheduling, preferences, and status.

Workers - Background jobs that run on schedule, check for upcoming appointments, send notifications.

Notifications - Email and SMS delivery, templates, tracking.

UI - Preference settings, reminder history, confirmation actions.

The Session

I described the feature in plain English. Claude built it layer by layer.

Hour 1: Data Layer - Schema design, migrations, seed data for testing. RLS policies for multi-tenant safety.

Hour 2: Backend - API routes, service layer, background job definitions. Integration with SendGrid for email, Twilio for SMS.

Hour 3: Frontend - Settings page, history component, confirmation flow. Connected to backend APIs.

What Made This Possible

Supabase ecosystem. Database, auth, storage, edge functions - all in one platform. No integration overhead.

Existing patterns. The codebase had established patterns for each layer. Claude followed them.

End-to-end thinking. Not "build the backend then build the frontend." Build them together, ensuring they fit.

The Result

Feature deployed same day. First reminder sent that evening. Confirmation rate: 73% (up from 0% - we didn't have reminders before).

The Compound Effect

This feature took 3 hours. Traditional estimate: 2-3 days.

Not because the code is simpler. Because there's no context switching, no waiting for dependencies, no integration surprises.

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Appointment reminders built for EDF-Pro, December 2025.