AI-Driven Presentation SaaS Platform Creation

I need to build a full AI-powered presentation generator SaaS platform inspired by Gamma.app’s presentation service.

The platform should include:

AI presentation generation from prompt
Paste text to presentation
Create from template
Import file or URL
AI slide editing
Card/slide-based editor
Themes, fonts, colors, brand kits
Arabic and English support with RTL
PDF export
PPTX export
PNG export
Shareable web link
Dashboard
Admin panel
Subscription and credit system
Collaboration and workspace features

This is not a basic website. I need an experienced AI SaaS development team with proven experience in LLMs, editors, file import/export, Arabic RTL, and scalable web applications.

Please share relevant examples, recommended tech stack, timeline, cost, and how you will handle PPTX/PDF export quality.