Then perhaps you could define a component in the project. With components, you can make the main developer the component lead, and then make the component lead the default assignee.
It's not possible to use Jelly Scripts in OnDemand, but you could add a post transition action to your workflow transition (the transition to Open, which you can access by clicking on the Open step and then the transition in the upper right on the edit workflow screen) which sets the assignee. You should make sure you have a unique workflow on that project, however, so you don't do this for every issue in your system.
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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