Online Course Platform Development

I'm seeking an experienced web developer to create a comprehensive online course website for my startup. The platform will focus on professional development courses and needs to seamlessly integrate with Razorpay for payment processing.

Key Requirements:
- Course Types: Professional development
- Essential Course Features: Video lectures, quizzes and assessments, downloadable resources
- Payment Gateway: Razorpay integration
- Integration with a certified institute

Ideal Skills and Experience:
- Proven experience in developing online learning platforms
- Strong expertise in payment gateway integration, particularly Razorpay
- Familiarity with professional development content and course structure
- Ability to integrate third-party institutes into the platform

Please provide samples of previous work and a detailed breakdown of your approach. Looking forward to your proposals!