So you're not a computer science engineer yet, you're still learning/studying. Do you have any references? Previous projects you've done or a Github repository with own code you can show? If not, maybe you should get voluntarily involved in one of the many projects here and show what you can do.
Hello, I'm a CS engineer even if I didn't finish my studying (by the way, I did finish, I'm doing my last internship which is part of the scholar but just a formality). About the learning, you never stop learning even if you become a CS engineer (get the diploma, as you say).
Yes, I have a GitHub with projects, just waiting to find the right person with the right project to show it to them. I don't get why people expect someone to work for free (voluntarily) to show what they can do.
even if someone is working for free they need to show their experience. Otherwise a terrorist could walk into a police station and freely offer his service.. by your logic, he shouldn't be background checked right?
volunteer or not, take your work seriously.