Strategic Systems International | 65,886 followers on LinkedIn. An advanced analytics and software engineering firm that builds data-driven applications for tech companies | Strategic Systems International (SSI) is Chicago-headquartered Advanced Analytics and Software Engineering firm that builds data-driven applications for Tech Companies and Enterprises. We are a team of data scientists, software engineers, architects, MBAs, business analysts and infrastructure management professionals. Founded in 1991 in an incubator in Evanston, IL by alumni of University of Chicago and Northwestern University, we now have offices in Europe, Asia and Latin America.