There doesn’t seem to be a way to easily find out which developer actually worked on a task. This is especially true because we use Asana for a Kanban process where the developer is usually not the person to mark the task as complete. Is there a feature available where you can flag a section or status so that you can pull a that answers the question: “who moved the cards to Ready for QA for this task and when” … essentially “who did the development” ?
I see a workaround to use a stagnant field for assigning tasks rather than the Asana Assigned field, but that is a lot of extra field management.