Location: Tubize, Belgium Key Responsibilities Define and maintain the overall system architecture for the Joint Common Operational Picture solution. Translate operational needs and stakeholder requirements into technical architecture and system design. Ensure interoperability across multi-domain command and control, sensor, communication, and information systems. Specify architecture principles, design rules, interfaces, and integration patterns. Support the development of data models, information exchange mechanisms, and service-oriented architectures. Contribute to requirements engineering, functional analysis, and system decomposition. Ensure compliance with applicable defence, security, and interoperability standards. Guide technical trade-off studies and architectural decisions covering performance, security, resilience, and scalability. Work closely with software, integration, cybersecurity, IVVQ, and operational teams throughout the lifecycle. Support solution integration across land, air, naval, cyber, space (but not limited to) and joint operational environments. Participate in customer workshops, technical reviews, design authorities, and architecture boards. Contribute to technical risk management and mitigation planning. Produce and maintain architectural documentation, interface control documents, and design baselines. Required Qualifications and Experience Degree in Systems Engineering, Computer Science, Software Engineering, Electronics, Telecommunications, or a related field. Proven experience as a System Architect, Solution Architect, or Lead Systems Engineer in complex defence, security, or mission-critical environments. Strong knowledge of command and control systems, operational information systems, or situational awareness platforms. Experience in architecting systems-of-systems and integrating distributed, heterogeneous solutions. Good understanding of: Systems engineering lifecycle Operational and technical architecture frameworks Interface definition and integration Real-time or near-real-time data processing Secure and resilient system design Familiarity with interoperability standards and protocols used in defence environments. Experience working in multi-stakeholder environments involving customers, partners, and subcontractors. Strong analytical, communication, and technical leadership skills. Ability to work under tight deadlines as well as in a very changeable environment and context Ability to obtain or hold relevant security clearance. Desirable Skills Experience with JCOP/COP, C4ISR, Battle Management Systems, or joint operational environments. Operational experience (direct or closely related) Knowledge of defence architecture frameworks such as NAF, MODAF, DODAF, or TOGAF. Familiarity with military interoperability standards such as: NATO standards Tactical data links Message exchange standards Geospatial and track management standards Understanding of cloud, edge, and hybrid deployment architectures in secure environments. Knowledge of cybersecurity-by-design principles. Experience with modelling tools such as Capella, Enterprise Architect, or similar. Experience in Agile and hybrid delivery environments. Key Competencies Systems thinking Technical leadership Stakeholder management Problem solving Structured communication Decision making Customer focus Collaboration in complex international environments Critical Thinking Able to “think outside of the box” YOUR CAREER AT THALES Future opportunities will allow you to discover other domains or sites. You will be able to evolve and grow your Competencies in different areas: Room and attention to personal development Build your talents in another domain of Thales Group, discovering new products, new customers, new country or go to a more complex Solution Choose between a technical expertise or a leadership path Build an international career within a leading Engineering Group