â Clearance: Active TS/SCI and Full Scope Polygraph Clearance Required (Expired within 18 Months is also acceptable) Description: The Software Engineer develops, maintains, and enhances complex and diverse software systems (e.g., processing-intensive analytics, novel algorithm development, manipulation of extremely large data sets, real time systems, and business management information systems) based upon documented requirements. Works individually or as part of a team. Reviews and tests softwa…