Systems architect

In systems engineering, the systems architect is the high-level designer of a system to be implemented. 

The systems architect establishes the basic structure of the system, defining the essential core design features and elements that provide the framework for all that follows, and are the hardest to change later. 

The systems architect provides the engineering view of the users' vision for what the system needs to be and do, and the paths along which it must be able to evolve, and strives to maintain the integrity of that vision as it evolves during detailed design and implementation.

ref:http://en.wikipedia.org/wiki/Systems_architect