Senior System Engineer

EFA GROUP comprises companies in Aerospace, Security, Defense, and Industrial Cooperation with a solid international presence. EFA GROUP currently employs more than 400 people, the majority of whom are engineers and scientists. Headquartered in Greece, the Group maintains a strong international presence across Europe (Cyprus, Belgium, Switzerland, Estonia, and Germany), Asia (Singapore, Indonesia, and South Korea), the Middle East (UAE), and the United States, serving customers in 34 countries worldwide.

The GROUP includes EFA VENTURES (Supply Chain Management and integrated services), AEROSPACE VENTURES (Industrial Participation and related services), SCYTALYS (Systems Integration and Software), ES SYSTEMS (MEMs & IoT Integration), EPICOS (Global Defense B2B Information Platform), UCANDRONE (Unmanned Systems), AETHER AERONAUTICS (Target Drones), STHENOS AI (Intelligence Solutions), THYREOS CYBER (cyber security) , SUPERIOR AIR (aviation services and specialized aerial missions), SSMART (defense hardware - software production and services).

SCYTALYS is a leading defense software development and systems integration company, founded in Greece in 1993. Serving customers in the Aerospace, Defense, and Security sectors, the company delivers advanced software solutions focused on interoperability, situational awareness, and mission effectiveness. Its expertise spans Tactical Data Links, Command & Control (C2/C4I) Systems, Training, Testing & Simulation, and Surveillance & Reconnaissance solutions.

The Role

SCYTALYS is looking for a skilled and motivated Senior System Engineer to lead the design, integration, and lifecycle management of complex systems and systems-of-systems.

Key Responsibilities

• Analyze stakeholder needs and operational requirements to define system and subsystem requirements
• Develop and maintain system architectures, including functional, logical, and physical views
• Apply MBSE principles and manage system models, requirements, interfaces, and lifecycle traceability
• Define and manage system interfaces and interface control documentation
• Plan and support integration, verification, validation, and acceptance activities
• Review system designs and implementation artifacts to ensure compliance with requirements and architectural objectives
• Identify technical risks, trade-offs, and performance considerations, proposing mitigation strategies when required
• Support system deployment, installation, and customer acceptance activities
• Mentor and guide engineers in systems engineering methodologies, MBSE practices, and systems thinking
• Collaborate with multidisciplinary teams to ensure successful project execution and system delivery

Required Skills and Qualifications

• 5+ years of experience in Systems Engineering
• BSc in Computer Science, Electrical/Electronics Engineering, Systems Engineering, or a related field
• Experience across multiple systems engineering disciplines, including Requirements Engineering, System Architecture & Design, MBSE, Integration Planning, and Verification & Validation
• Proven experience defining technical specifications, decomposing requirements, and developing system architectures
• Advanced knowledge of systems engineering methodologies, frameworks, and architectural principles
• Experience applying MBSE practices and working with SysML or similar modeling tools
• Knowledge of system interfaces and structured data formats such as XML and JSON
• Understanding of relational and non-relational databases
• Familiarity with Windows and Linux environments from a system design and deployment perspective
• Advanced knowledge of computer networking concepts and architectures
• Willingness to travel to customer sites when required
• Fluency in English