Customer journey mapping, especially at an enterprise level, can quickly grow to be very complex. That's why this undertaking is sometimes outsourced to a specialized user experience company that manages customer journey mapping on your behalf. Here are a few examples of customer journey mapping service providers:
Customer Experience Group - 4 cooperative agencies covering all major aspects of CX
McorpCX - Customer research and journey mapping paired with CX learning modules
Appnovation - Devise bespoke touch point strategies and optimize content messaging
Vertic - Customer experience agency with marketing-as-a-service (MaaS) products
TCXA - Strategy, brand, technology, and marketing tools with a main focus on CX
PH1 - Audits, journey mapping, persona development, and Design Thinking workshops