That depends on your supervisor. Before deciding to write your thesis in an enterprise, you should first think about the topic of your thesis and consider which docent would thematically be interested and willing to supervise your thesis.
The topic of your choice should meet the university requirements, which means that the task is supposed to demonstrate the absolvent’s skills not only on a technical but also on a conceptional level.
If you have found an appropriate topic, write a short text of about 1-2 pages including the content of your topic (What is it about?) and the suitability (How does it meet the university requirements?) and go to the office hours of the docent.