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This paper is one of several in a special session on Dyreqt, a framework built up over the past ten years at NASA Marshall Space Flight Center (MSFC) for the multidisciplinary design, analysis, and optimization (MDAO) of space system architectures. Mission engineering is a nascent, holistic, digitally-native approach to engineering future missions. To realize such an undertaking for space exploration, we identify some challenges: configuration management of fractal-like, recursive structures of the system-of-systems (SoS) definition --- especially in the early-phases of architecting activities of space SoS --- presents significant challenges. We address these challenges by infusing advances from software engineering and modern digital technologies, adopting composable architectures and a supporting digital infrastructure that equip architects with modern, scalable tools. This paper presents a subset of the digital engineering ecosystem developed at NASA MSFC's Advanced Concepts Office and its role in the broader mission engineering environment. The ecosystem delivers software-as-a-service (SaaS) solutions centered around the Dyreqt modelling framework, realizing reproducibility, configuration management, consistent use of version-controlled model libraries, and many advances from software engineering. We also describe our approach of reusable, composable model libraries and we introduce a web-based SaaS application to improve early-phase concurrent engineering activities that allows architects to interact with a graphical domain-specific language (DSL), including automatically transforming it into Dyreqt's DSL for execution. Together, these technologies advance key digital engineering tenets: authoritative sources of truth, model consistency, and enhanced interdisciplinary communication. This new ecosystem has supported numerous studies, demonstrating its effectiveness in accelerating conceptual design and supporting broader mission engineering capabilities.
DOI: 10.2514/6.2026-1366