Build me an app for android/iOS plus website for a new long term project

I need an expert in apps and website creation to build me a new app both for iOS and android for my new project, this is long term and I need someone with a team that can complete the entire project FAST and continue to work with me down the line.

It is for a service based app/website.

If you are interested, send me previous samples of your website/app work.