Backend Development for Multi-Popup Platform

I'm seeking a skilled backend developer, proficient in either NEXT.js or PHP Laravel, to create a robust platform for embedding various types of popups through HTML snippets. Here’s a list of the popups: Informational, Coupon, Live Counter, Email Collector, Conversions, Conversions Counter, Video, Social Share, Reviews, Emoji Feedback, Cookie Notification, Score Feedback, Request Collector, Countdown Collector, Custom HTML.

Ideal Skills:
- Extensive experience with NEXT.js or PHP Laravel
- Proficiency in backend development
- Familiarity with Stripe integration
- Ability to handle diverse HTML snippet types
- Experience with developing interactive platforms
- SaaS Experienced

Key Requirements:
- Development of a backend-only platform capable of supporting diverse popups
- Integration of Stripe for real-time notifications, payment processing, subscription management, and refund handling
- Implementation of social share popups, reviews, emoji feedback, cookie notifications, score collectors, feedback request collectors, countdown collectors, and custom HTML popups
- Support for embedding different types of HTML snippets: static content, dynamic content with API calls, and interactive elements like forms

The project needs to be completed within a 15-day timeline. Please provide examples of relevant past projects in your bid.