Hello,
We can create a web system for you with languages (php, html, js) for project management and approval of tasks by the clients who will have the workspaces. Regarding the integration of Trello or asana this is quite possible and we would like to work on this project. We have been in web and mobile development for over 5 years and we have had to carry out several web application or software design projects. We will therefore be delighted to collaborate with you for a job well done and in a timely manner. Please contact.