The newbie programer effect is part of the lacking Integration of Zoning in a Codebase. Thus its a IDE problem.

You cant go and declare some basic tool classes only editable by a expert/architect or a newb under "SignOff" Supervision. There is also no real metric on expertise, and a way to prevent non-experts to go banana on something beyond the scope of there fields. You do not want a assembler coder going first time OO and in reverse. What actually would help is a sort of guild - where one has to accomplish certain feats first, before beeing allowed to level up..