Powerpoint Plugin and Adding developer

Hello, I am looking for someone who can help us develop Powerpoint Plugins on ongoing basis for adding specialised functionalities & features to PPT. We have a list of several plugins like 1) Slide time recorder 2) Template and Infographic maker (Linked with an external database like [login to view URL]) 3) and more. The hired team or person will be actively engaged on making new plugins and eventually, all of these plugins have to be linked to an online SaaS so that people can activate and deactivate the service they need and accordingly their subscription fee will keep on changing. The assignment also involves the development of the Online Application from where the plugins subscription can be controlled. To give an example, we have about 50 plugins available with each at 1 USD. So, if a User wants 2 plugins, he can activate a new subscription at $2/month and can login into his Powerpoint Plugin to use that feature. If the person stops using it, he/she will no longer be able to access the premium features. Team with prior experience of developing such plugins will be preferred. Thanks Aayush