No, it is not a requirement. In answering the pre-assignment included in the application process, you can utilize your previous jobs or possible plans of your own business.
Studies are possible to conduct while you are unemployed, on study leave or on another leave. Thesis is a development project, which is usually done for the student’s own organization but is can be done for another organization or for your own business. In addition, Haaga-Helia offers possibilities to do thesis within RDI projects.