Model-Based Systems Engineers use formal models to represent system requirements, architecture, behavior, and interfaces. Their work replaces document-heavy approaches with integrated digital models that improve consistency, traceability, and early validation. They develop system models, run simulations, and support trade studies using modeling languages and tools. MBSE Engineers collaborate with systems, software, and hardware teams to guide design decisions and manage complexity. They work in aerospace, defense, transportation, energy, and advanced manufacturing sectors. Globally, demand is increasing as organizations adopt digital engineering and seek more efficient, accurate methods for designing and managing complex systems.