It's time to use full potential of your journey builder app
You purchased your Journey Builder app and have a use case where you like to use Custom Activity.
It could be either making web service call to your internal system to retrieve additional information for the the contact or it could be about making a web service to just pass on the contact information.
Or, you might have a different case. None of this is possible using activities available out of the box.
We can build that custom activity specific for your need so that you don't have to learn and do it yourself.
We use NodeJS to build custom activity. The custom activity can be hosted in your environment of choice. Usually clients use Heroku but you could install in BlueMix or other environment of your choice as long as it meets Marketing cloud's criteria.