Ensure a better acceptance of your tools and process by integrating them smartly into your existing environment.
"The client doesn't care about the code." ...
Be wary, if you have one person doing it all. You may not get what's best for you.
It can be tempting to just give some requirements to a developer, let him disappear for some time to build and only show up when a product is ready. Don't! The risk and costs related far outweigh the benefits.
Issues will happen, problem will come up, expectedly or not, visibly or invisibly. The worst that can happen is you not knowing and reacting mindfully to a situation.