We have worked on Wordpress and have developed so many wordpress websites. We can develop a child theme as described by you. We have a team of professional web designers & developers based in Noida, Delhi NCR, India.
We have worked on PHP, Wordpress, Shopping Cart, Opencart, ecommerce, Expert Wordpress Woocomerce, User registration/ Login, API integration, Display product with details, Share videos/ Images/ music, payment integration and so on.
I am very much confident enough that our web designers and Wordpress developer will create a child theme for you and will perform the task as assign in given time frame.
References are available if asked.
Please provide us more details regarding project so that we can move further.
waiting for your positive response.
Thanks
Vijay