I think that the best way to deal with it is to discuss the problem with your team lead and introduce a mandatory code review process in your team. I mean usin

I think that the best way to deal with it is to discuss the problem with your team lead and introduce a mandatory code review process in your team. I mean using of Crucible, Github pull requests or something like it and reviewing all commits by one of senior developers. Then commits that don't follow coding standards of you team will be rejected in the issues will be fixed. However you also have to establish coding guidelines for your team to use them as a reason to reject some commits. It will not only help your team with following coding style guidelines, but also improve the code quality in general.