Unsourced material may be challenged and removed. (September 2015). A systems integrator is a person or company that specializes in bringing together component subsystems into a whole and ensuring that those subsystems function together, a practice known as system integration.n entertainment and architectural installations, systems integrators function as a designer/engineer, bringing together a wide array of components from various manufacturers to accomplish the goal of creating a unified, functioning system that meets the needs of the client.