Hi,
As per my understanding you want to fix 3 tasks so you're looking for the skilled shopify developer. I have mentioned my understanding below, let me know we are on same track:
1. You want to redirect the orders directly on the Aliexpress once the customer placed orders on your site.
2. Add shipping options on cart page and calculate the shipping charges accordingly.
3. For the third one I need to check the app work flow and the code so that I can come-up with the proper solution.
I'm keen to get started with this project right away. I would be delighted to customization your Shopify site as per the desired customization. I have rich experience in all these skills, which you assigned to this project.
I am really interested to work with you and I strongly believe that we will manage to create the perfect work for you & we can produce aweosme work together.
To further assist you and provide you with solutions specifically designed as per your needs and desires, I would request you to kindly send me invite so we could connect online and discuss the project in depth.
Looking forward to hearing from you.
Thank you for your time and consideration.
Regards,
Saurav