Build an Online Store

Social Media Auto-Scheduler (initially Twitter) Scope: I am wanting to create a Social Media auto-scheduler product/service similar to BufferApp starting with Twitter Scheduling. 1. Looking for a developer to use [login to view URL] open source ([login to view URL]) to create this service. 2. Looking for and direction on how service can be secure for individual authentication/authorization and payments. What platform is secure and scalable? Initial Requirements: 1. Ability to use Circular UI and full Circular functionality/feature-set. 2. Ability to have Chrome Extension (similar to the current Circular Chrome extension). 3. Capability to expand to add additional social media channels 4. Capability to expand to accommodate 2 schedulers for each social media channel. 5. Capability to expand to accept bulk download of post to individual and multiple social media channels. 6. Closely replicate Buffer UI and functionality. a. Online UI/UX and Chrome extension. 7. Ability to have secure individual customer account authorization, authentication and billing. a. Flexibility on billing customer on a monthly and annual basis. b. Secure https website for application 8. Ability to tie into PayPal. 9. Ability to host application outside of GitHub. a. What is the best scalable option for hosting application (and website)? 10. Ability to brand new application. Future Functionality: 1. Ability to add images to Social Media channels posts. 2. Ability to have 2 schedulers for each Social Media channel. 3. Ability to add additional Social Media channels (Facebook, Instagram, LinkedIn, Google+) 4. Ability to Bulk Upload to individual and multiple social media channels. a. [login to view URL] 5. Ability to add Hashtags from a Hashtag library (Online & Chrome extension). 6. Ability to create a 'Categories' library to save posts. Be able to post in bulk from 'Categories'. 7. Ability to have API for functionality sharing with other applications/vendors. Skills: PHP, MySQL, SQL, HTML% Twitter Dev, Twitter API Chrome Extension