I've been working with Salesforce Marketing Cloud in some capacity since 2007.
My specializations are: SFMC API (especially SOAP), Server Side Javascript, AMPScript, Triggers, Automations, Data Extensions, Script Activities, Administration.
I recently also took over a customized Sales Cloud instance that feeds offers to our Marketing Cloud and have quickly ramped up on Apex, Apex Triggers, and some other more technical features of Sales/Service Cloud.
Interested in working more with Heroku.