Wow! I'm studying development and want to participate in different hackathons, too. I'm just at the beginning of my path, but I think I can become a brilliant developer. I can advise you to use online logo creator. I don't think that for one logo you need to bother with installing graphic design software. This creator is enough to make a team logo. Lots of brands use this service. It takes a little time and the task can be done by anyone, even someone who does not know what design is.