Kforce's client, a pioneering global technology firm in Marlborough, MA, is seeking a Principal Systems Engineer (Model-Based Systems Engineering - MBSE) to support mission-critical projects involving Information Assurance (IA) and secure system design. This is a high-impact role within a collaborative, cross-functional engineering team. Key Responsibilities: * Lead and support systems engineering activities focused on Information Assurance (IA), including the analysis of security architectures and conducting vulnerability assessments * Collaborate with interdisciplinary teams to address complex security challenges and implement robust, scalable solutions * Analyze system requirements and contribute to multiple product release cycles using tools such as DOORS * Define and allocate security requirements, assess vulnerabilities, and support certification and compliance initiatives * Develop and maintain security-related documentation in a team-oriented development environment