How to avoid bad code from contractors

If you work with large projects, there is often a situation where you need additional resources and the company does not have them. It would seem that you can hire an external contractor, but since the project is complex and large, it is risky.

The solution is an established project teamlid, which allocates 10-30% per day for code review and review of what the contractor sends before adding it to the new release branch. And of course the regulations describing your tracker, version control system, code design and individual components.