Process Designer 

Process Designer: a person in this role works with business managers and staff to define and validate the future‐state operational design of processes. The Process Designer is thus the catalyst to the future‐state design and its continuous evolution. These people understand the mechanisms of the business and know how to develop a solution that meets performance targets, is scalable, and can be easily maintained. The Process Architect views the process from the perspective of how it interacts with the bigger picture (outside in).

Source: Guide to the Business Process Management Body of Knowledge – ABPMP BPM CBOK V3.0.

See also Optimizing an organizational process structure.