Full-Stack AI Developer – Personalised Children’s Book MVP

I’m looking for a developer to build a working MVP for an AI personalised children’s book website.
Customer flow:

Choose from 10 stories → select boy/girl → enter name + age → upload child photo → AI creates their character → generate personalised storybook pages → interactive preview → Stripe payment → full book generated → print-ready PDF.

Ideally something like https://imagitime.com/

Main requirements:
OpenAI image API integration
Keep the same child recognisable across 24–30 different scenes
10 pre-written story templates
Boy/girl personalisation
Photo upload
Character approval/regenerate option
5–7 page preview before payment
Full book generation after payment
Interactive page-turn preview
Stripe checkout
Automatic print-ready PDF
Simple admin area
Secure storage of children's photos

Mobile-friendly premium website
Preferred stack: Next.js/React + OpenAI API + Supabase + Stripe, but I'm open to recommendations.

The most important thing is the AI character consistency — please explain how you would keep the uploaded child looking like the same person throughout the entire book.