Create a Shopify App (Not Mobile App)

General information for the website: Create Shopify App Development
Kind of development: Customization of existing website
Description of requirements/features: Looking for a Freelancer, who has experience in developing Shopify App which is already listed in App Store. I need someone who can take maintenance for this App and add new features to it.

I will share details about my project only to selected candidate. Need to finalize the candidate by Tomorrow.

Thanks for your time and applying to this job.

Note: All copy paste responses will be ignored, I only need to know have you developed any Shopify App? If your Answer is yes: than which App have you developed? Make sure, in your response you need to start with "Shopify App Developer".
Extra notes: I do not need any Mobile App Development. I am looking for Someone have experience in Shopify App and have experience in publishing Shopify App on Shopify Cloud Store.