Desarrollar software

We are looking to develop a very complete cloud web app similar to the ZOHO suite the following features: - with invoice (very much like zoho invoice) (with international CC payments and paypal) - mail - Inner chat (Slack like) - CRM - Campaigns - Forms - Project Manager (similar to basecamp or meistertask) We are open to technology proposals, don't have a programming specific requirement. Proposal must include server recommendation, wireframe/flowchart, design reviews and testing stages.