We are currently using Tweetily plugin for Twitter / Wordpress and this is exactly what we want to do except we want to do it for Tumblr.
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The major exception is we want the plugin to post WooCommerce Products to Tumblr, on an automated schedule (like tweetily does for twitter).
The plugin should post Product Image, Product Link, Shortlink, and rest of automation / schedule options you see in Tweetily.
We are paying minimal $40 for this simple plugin.
3 freelancers are bidding on average $97 for this job
I have a large experience in developing Wordpress plugins. I follow the MVC design pattern, keep the code light and transparent. Don't hesitate to contact me. Cheers!