Dear employer,
I have already developed a 2D spring model in Java two weeks ago (as a private project) and would be happy to extend it to your needs (and 3D).
With over 5 years of experience in Java and a great interest in mathematics and physics (I will start studying these subjects this semester) I hope to be the right freelancer for you project.
I can send you the mentioned project and other examples of my work. Also please have a look at my profile to see a list of my past projects on freelancer.com.
Thank you for considering my bid,
Sid Maibach