I had a lot of success back in 2013/14 by having our outsourced graphic designer directly modify JSX files in our codebase. He picked up just enough javascript

I had a lot of success back in 2013/14 by having our outsourced graphic designer directly modify JSX files in our codebase. He picked up just enough javascript to figure it out. I just told him where the file was or set up a test harness and he delivered pull requests against our actual codebase.