Programm embedded Mailchimp Signup Form for Weebly

I need somebody skilled in Mailchimp API. Who is programming for me some signup / update forms for Mailchimp, so i can add them as embedded code within Weebly / Wix. The signup form is simple: E-Mail Firstname Groups (as checkboxes) --> add to groups in Mailchimp, 1 Group is "checked" as default Redirect Thank you page (as hidden field) Javascript for check the fields not beeing empty and that E-Mail Address is correct. After sumitting the form, the user should be added to my Mailchimp list as singe Opt-in and then beeing redirect to a thank you page (passed to the php file with some hidden field "redirect" If a user is already registered in the list, the fields are beeing updated (including groups). If cooperation is working nice, more forms are coming.