Is it possible to an individual developer to invite another developer to manage apps on iTunes Connect?

I developed an application for my friend who has an individual developer registration, I have got a simple developer registration without individual enrollment.

Is it possible to invite me at the Apple App Store to manage this application? or we need a company registration?

Solution 1:

Only Company / Organization accounts can add additional developers to its team. As stated under the Enrollment Selection page, in the Individual account section:

Individual Development Only

You are the only one allowed access to program resources.

Solution 2:

Whilst @Thecafremo's answer is true for program resources, to manage apps as OP stated, you can add users to access iTunes Connect without needing a company account.

Simply go to iTunes Connect → Manage Users → iTunes Connect User → Add New User.