Hi Leandro, *Leandro Zanotto <leandro.zanotto@gmail.com> [15/08/31]:

How  can I send the bugs I found?

Can I request new improvements / features?

If I change something locally can I show to dev team  what I did and share my code?

We are always happy to accept code contributions! You basically have two options to share code with us. Either create a patch / a set of patches and send it via this mailing list. Or fork the DOMjudge repository on github, implement the bug fix (or feature) in your fork and create a pull request. This mailing list is also perfect for discussions on bugs or feature requests. Tobi