I have experience with Unreal (c++ and blueprint) and Unity, but it's been a while since I've touched Unity, but I don't think I'd have difficulty getting back into it. I've worked on 2D and 3D projects, currently working on a FPS so 3D is what's freshest in my head. I also have experience in 3D modelling and animation, mostly in making low-poly art.
Also, this will be my first game jam!
My discord is dirtydan314