Auto Ad Poster on Gumtree

My company is looking for a reliable Freelancer to help us post ads on online listing sites such as Gumtree. Specifically, we would like to post ads in the 'For Sale' category and need them to be posted every 3 hours, with no more than 10 ads per day.
We are looking for a individual with some pre-existing experience in auto-ad posting and excellent communication skills.
Hi,

I require software to be created to automatically post gumtree ads on gumtree.com

1) There should be a template where I can add, save and edit ads that are to be posted.

2) The programme should be able to auto-select the pre-specified Category for the product item and auto-input all data from the ads template including Title, Images, Description and Contact Details.

4) I want the ads to be automatically, repeatedly posted on gumtree website with the specified time interval.

5) I would also like the option for the existing ads to be deleted on publishing the new ads.

My main category for posting ads will be under for sale category.

I look forward to hearing from you.