Thank you for the context. Sadly, (on this occasion) it doesn't really give any specific clues about the exact nature of the expression, but it obviously means someone who is an experienced and successful operator: in this particular context, someone who is used to running a large and thriving enterprise, with a history of attracting outside funding. In a gambling context, he might be called a "high roller". Perhaps the "revvie" element refers to "revenue", as in someone who attracts a heavy (ie high) amount of revenue. Alternatively, to take an example from motor-sport, "heavy revvie" might equate to a "high revving" individual: someone who operates at the peak of performance. Take your pick....
PS. Better to say What does "heavy revvie" mean?