Hello dear client. I understand your request for a web application that integrates with mailchimp, getresponse and other email marketing tools. Do you have this web app already? What kind of web app is it-commercial or general?
Over the past five have worked with several api's and built several endpoints and automations in python and javascript and i can help you with this. I am experience with PSD, Html, Php, Js, node.js, UI/UX and several web automation frameworks such as selenium . I will also help you with response html templates that are accurate ad generated from AI. Message me to discuss further. Kindest regards.