For large companies with large marketing budgets, top consulting firms such as Accenture and Deloitte now provide marketing technology services that range from strategy to implementation and management. These firms are smartly leveraging their IT expertise and experience to deliver a suite of complementary marketing services. 

With a stack framework in place, category/functional specialists and agencies can deliver exceptional value once you know what type of technology you need.  You can find experts in virtually every technology category. Agencies that are category/functional experts (e.g. SEO, Digital Advertising) will in many instances source and then deploy and manage technology on their client’s behalf. This is particularly helpful in resource- or expertise-constrained environments and virtually mandatory in a startup environment.