Layers of Architecture
There are tons of architects out there today. It seems when you’ve spent enough time as a developer, you end up becoming an architect. Architecture is not just the next step in a developers career. There are whole new disciplines and methodologies applicable to architecture. That said here are the common levels of architecture.
Enterprise Architecture (planner)
Enterprise architecture is a high level field that concentrates on how the various domains or subject areas interact. This layer spends even more time focusing on how technology will be utilized in the future, and governing how it is used today. Enterprise architects work to create technology roadmaps and work with the business to plan for the implementation. Enterprise architects create technology projects. It is at this layer where frameworks like TOGAF and taxonomies like Zachman come into play. This layer view the enterprise as a holistic entity.
Solution Architecture (designer)
A solution is an answer to a question. The question in this case is typically an IT project. The solution architect’s primary objective is to design a solution that meets the projects requirements and also falls in line with the domain and enterprise architecture guidelines. The solution architect is responsible for coordinating with multiple domain architects to design the most appropriate solution. A solution architect may interact with domain architects in infrastructure, web services, data management, and so on. During the course of the project a solution architect will typically create many work products either for communicating the solution to a governance board, to explain the implantation to a developer and various other uses. These work products are eventually owned by the domain architect as codified knowledge of the system after the project implementation.
Domain Architecture (owner)
A domain is an area of focus. Domain architects are primarily focused on maintain a specific area of technology or a specific application. These architects are the owners and gatekeepers for a specific area. The work in this area is primarily concerned with the current state of the system. These architects are charged with managing the knowledge for their area. These architects are also responsible for keeping up to date on future projects related to the domain and guiding the designs to meet the overall objectives of the domain. A successful domain architect will know that a future project will require x functionality. When an active project is debating between two possible implementations, the domain architect will be able to guide solution toward the best of the two solutions that meet the future goals.
Application or System Architecture(builder)
The application or system architect is primarily focused on the implementation at hand. This is the most detailed level of architecture. An application architect, for instance, would be concerned with the most appropriate design pattern to use in a certain programming situations. These tend to evolve from the most advance developers and engineers. The primary focus here is to implement the best solution for a specific task. Work products that may be produced during this layer are primarily used to communicate to the developers or implementers. In many co-located environments a lead developer often fills this role and very few work products are actually produced. Instead the team may utilized whiteboards or code stubs to communicate the implementation. For larger more dispersed projects, or for outsourced solutions, the application or system architect has a more demanding role for providing detailed implantation instructions.
Conclusion
The various layers of architecture are not meant to be isolated entities. In most situations one architect will fill multiple roles at various levels. Each layer has a unique focus. Understanding the layers helps clarify responsibilities, activates and deliverables. From a career development standpoint individuals can use the layers as the basis for a personal gap analysis and learning plan.
I look forward to reading your thoughts and comments.
Best of luck in all your endeavors.
