Aider is one of my favorite AI agents, especially because it can work with existing codebases. We've seen a lot of good results from folks who used it with Wasp (https://github.com/wasp-lang/wasp) - a full-stack web framework I'm working on.
A "marketingy" demo video: https://www.youtube.com/watch?v=DXunbNBpgZg&ab_channel=Wasp