I can provide front-end and back-end development services for Single-page applications (SPA's), Multi-page applications (MPA's), and cross-platform/native mobile applications. These applications could be bespoke tools that require a subscription from prospective clients, i.e., a RESTful application for a mobile-like experience, or a template-driven e-commerce application, optimised for Search Engine Optimisation (SEO). 

I would utilise Stripe or a similar payment API's to allow your application to process payments, as well as implement an administrator dashboard, where you could interact with the database via a GUI. Applications could be hosted on a variety of platforms, such as DigitalOcean, Heroku, or a cloud services provider such as AWS, Azure or GCP, depending on whether the application would be containerised via Docker.

Furthermore, I can create bespoke landing pages/blogs for your business, if you wish to maintain an online presence via a Content Delivery Network (CDN) such as Netlify or Vercel.