Add Salesforce DX Users
Your developer users can use Salesforce DX with the Salesforce, and Salesforce Platform standard user license, or you can assign them the Developer license, or the Salesforce Limited Access - Free license instead.
If your org has Developer licenses, you can add users with the Developer profile and assign them the provided Developer permission set. Alternatively, you can add users with the Standard User or System Administrator profiles. For a standard user, you must create a permission set with the required Dev Hub permissions. We recommend that you avoid adding users as system administrators unless their work requires that level of authority and not just Dev Hub org access.