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).
STHENOS AI is the AI developer of EFA Group, building intelligent, mission-ready solutions for defense and aerospace. With deep expertise in Command-and-Control (C2), cyber defense, computer vision, and autonomous systems, we design and deploy secure, field-proven AI that enhances operational efficiency and situational awareness. As part of a leading European defense ecosystem, we bring scalable innovation where it matters most - in the theater of operations. Internally, we are building a unified operations platform: a single system through which the entire company will run its daily work, with AI woven through every workflow. We have validated the concept with a working prototype and are now assembling a small senior team to build the production platform properly, from the ground up.
The Role
STHENOS AI is looking for an Autonomous Systems Engineer, who will be part of the engineering team and will contribute actively to the development of intelligent and autonomous software systems. You will work on the implementation, integration, and optimization of software components across the stack of autonomous systems while collaborating closely with senior engineers, AI specialists, and platform teams.
Key Responsibilities
- Contribute to the design and implementation of software components for autonomous and AI-driven systems
- Develop and maintain software applications primarily in C++ and Python
- Implement and support modules related to perception, localization, planning, sensor integration, and system orchestration
- Collaborate with senior engineers on software architecture, technical solutions, and continuous improvements
- Integrate, test, and validate autonomous frameworks and middleware solutions
- Contribute to simulation environments, validation activities, and debugging efforts for autonomous applications
- Write clean, maintainable, and well-tested code in line with engineering best practices
- Participate in peer reviews and support initiatives that improve code quality and engineering standards
- Contribute to CI/CD pipelines, software deployment processes, and development workflows
- Support troubleshooting, performance optimization, and issue resolution across development and production environments
- Help ensure quality, reliability, safety, and cybersecurity requirements throughout the software lifecycle
- Collaborate effectively within cross-functional engineering teams and contribute to a positive, high-performing engineering culture
Requirements
- 1+ years of professional experience in Software Engineering, Robotics, or Autonomous Systems with good expertise in C++ and Python
- Understanding of core autonomous systems concepts such as perception, localization, sensor fusion, planning, or control
- Strong software engineering fundamentals including algorithms, data structures, object-oriented design, and Linux-based development
- Experience with Git, collaborative development workflows, debugging, and writing maintainable, testable code
- Familiarity with APIs, multithreading, containerization, and modern software development practices
Nice to Have
- Experience with autonomous frameworks, robotics middleware, or ROS/ROS2 ecosystems
- Familiarity with simulation and validation environments for autonomous systems
- Experience with Docker, CI/CD pipelines, cloud-native environments, or edge computing
- Exposure to AI/ML integration within robotics or autonomous platforms
- Experience working with sensors such as LiDAR, cameras, GNSS, IMUs, or radar
Your Competencies
- Strong analytical and problem-solving skills
- Ability to work independently while also collaborating effectively within a team
- Passion for autonomous systems, robotics, and AI-driven technologies
- Structured and detail-oriented way of working
- Willingness to learn and grow in a fast-paced engineering environment
- Openness to feedback and continuous improvement
- Good communication skills and ability to discuss technical concepts clearly
- Fluent in English, both written and spoken