Hello,
Just read over your project application. My name is Shelingholmes, I am Wordpress Developer, 4 years experience in wp especially when it's come to themes and plugin development ..
I can build the plugins as your requested, that will be work in sync a woocommerce order with Google calendar ( booking system ), accounting and marketing integration ..
I have read Woocommerce documentation about Google Calendar in woocommerce website, and I'm sure i can do this integration with my own custom module/plugins ... My experience in Wordpress including Rules how to code a good wordpress tools, which very useful when coding a Plugin that optimized, and ensure me to build one that avoid bug as much as possible
For Marketing itself, I recommend to using automation feature by Mailchimp ( email sent by Mandrill ), we can send series email based whenever user ordered a place. Both is good combination since placed in 1 company . . . I have lot experience as well in Mailchimp, as you might see in my profile, mailchimp and email marketing is one of my specialty in Freelancer, Surely, I'll able to do whether using mailchimp, custom api, etc :)
For Xero, honestly, i don't have any experience with it, but with my current programming skills, I'm sure it's not hard to learn since Xero is a Big Company with Great documentation provided
Please let me know if you're interested, if possible, i would like to discuss further details related the project
Thank you ^_^ and
Regards,
Shelingholmes