This is a great opportunity to pair program with this person. You have the advantage of knowing the codebase and the company style/nuances. Sit down and show h

This is a great opportunity to pair program with this person. You have the advantage of knowing the codebase and the company style/nuances. Sit down and show him. Don't point the things that are wrong. Make a list if all the functionality required and then read line by line or chunk by chunk. Write code and tests as you move along. Let him write it but you take lead on how. Ultimately, step on his shoes. It's the worst feeling in the world when someone says you wrote shit code. Don't make him feel shitty. Make him feel like he is part of a growing team.