Mailchimp Integration

We are looking for integration with Mailchimp on our web based CRM product. We have written our CRM in PHP 8.1 and Laravel 9.9 and frontend in tailwind CSS. We would require experience in these languages. We would like to make our web based product a marketing tool. We have built an SMS system within ours that allows you to create templates (image attached). It would be good if we could use our template system already written for SMS to be done also for templates for email templates that can be sent from Mailchimp. We need the facility for the following:- To create email templates and sync to Mailchimp or vice versa Mailchimp to ours, be able to preview and create Mailchimp campaigns within our system. To import our contacts and prospects from our system into Mailchimp. This needs to be selectable so you can choose all contacts or just leads/prospect contacts, we would also be able to create groups of contacts based on different filter options. The facility to send emails from Mailchimp and then the replies go into our system so we can add actions to them. Anything else that you think from experience that will make our product a powerful marketing tool. Our system allows us already to do leads/pipelines and has a sales system module to it. If we can get leads from Mailchimp to then fall into the sales system as a lead with details of the campaign it came from it would be more automated and efficient for ourselves and our clients. I would like a fixed price quote for this and estimated time scales. Happy to give you a demo of our system so you can see how we envision this integration to work.