I am currently looking for a job as a junior UI web developer in another country, and I am trying to build an extremely simple portfolio (actually made of links to my apps), which includes a ToDo list, and eventually this application.
When I was employed in my previous company I was asked to create a management application that was used by the agents to control their appointments with the clients, but after a while I've turned it into a whole management application for almost all the internals of the company.
Now I want to edit the app in order to make it more simple, using different tecnologies inside it (like switching from Jquery to AngularJs) to display the skills I have written in my CV and uploading it on my GitHub, but I am not sure if this is correct under an ethical point of view or I should avoid it (maybe because other companies could not like this behaviour).
I might be doing a new app, but I have no time to develop something this complex but at the same time I have nothing to demonstrate that I can do more then a ToDoList app.