What do you mean "cloud based"? There are hosting services providers that offers you the choice to be hosted "in the cloud", transparently for the hosted web site.
Another issue is how much Accounting? What type of system?
Considering reasonable requests I recommend myself (and the team if necessary).
I have solid experience in web design and web coding as I built complete online solutions for different project.
I have strong knowledge of HTML, HTML5, CSS, CSS3, PHP, MySQL, Javascript, Ajax. I do not use any third party software or environment for developing so no license, no update, and no third party ties for you in the future.
I use to work only with pure language, no dev environment in order to control the scalability, integration and bug propagation.
I am sure I can build for you perfectly.
Thank you.