Those things can sometimes be learned quickly, but it takes time. If your company can't have, or doesn't want, productive developers to be spending a lot of tim

Those things can sometimes be learned quickly, but it takes time. If your company can't have, or doesn't want, productive developers to be spending a lot of time mentoring, then it can be worth it to hire people trained in your working language, possibly even familiar with your style of program or library ecosystem (if you have one of those).