Website Chatbot Web Application

I'm looking for a skilled professional to build an online chatbot application. The main purpose of this application would be to allow users to sign up to the platform, build their chatbots and implement it into their website using a small custom piece of javascript code which will be placed in their header.

Key Functionalities:
- Lead Qualification: The chatbot should be able to ask qualifying questions to potential leads to determine their fit for customers products or services and lead them to that product or service.
- Lead Capture: It should have the capability to collect contact details from interested leads.
- Lead Nurturing: The chatbot must be able to engage with leads in a manner that nurtures the relationship and keeps them interested in customers offerings.

I'm looking for a freelancer with experience in software development, particularly on website platforms. A good understanding of lead generation strategies, customer behavior, and conversational AI will be a bonus.