Yes, If you wish to share access to your account, You can invite him with desired permissions to your account. Please note: This feature is available for Premium, Premium+ and Enterprise plans. Compare plans here.
Sendinblue account owners can delegate access to their account to multiple additional users.
Whether you are a marketing agency managing multiple clients, an enterprise with small/large teams, or a business owner requiring separate access for developers working on integration, you can collaborate with your team by inviting them to access your account without sharing your account credentials.
Invited users will not be able to edit your plan selection, manage access for other users, or see your billing and payment information.