Need expert on open source document management system e.g. logicaldoc alfresco nuxeo

i want to build a saas application for report generation and now considering which open source document management system that i need to start with, the focus of my application need: 1) different client customer will have different login and database; 2) better to have task and project management; 3) database repository if possible; 4) apply java script easily on front-end; 5) the main focus will be on storage of document and drag and drop with desktop is important; 6) can allow to apply integration with libreoffice online (want to have capability of online editing); 7) i need also to apply html editor on editing documents; I need expert who have experience on the above system and assist me to install the relevant system; If qualify enough, then expert can assist me in next phase to continue to build my application to set up a report generator system.