Staff Frontend Engineer
Confirmed on the employer's own hiring board on Nov 1, 2026. First seen by Alion on Oct 29, 2026.
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 currently looking for an experienced Staff Frontend Engineer to provide technical leadership in the design and development of modern web applications for mission-critical systems. The successful candidate will play a key role in defining front-end architecture and engineering standards, solving complex technical challenges, and guiding teams in delivering scalable, high-performance, and maintainable solutions.
Key Responsibilities
- Define and drive the technical direction and architecture of large-scale front-end applications using React
- Design scalable, reusable, and maintainable front-end architectures, component libraries, and shared frameworks
- Lead architectural decisions and provide technical guidance across front-end initiatives
- Translate complex UI/UX requirements into high-quality, accessible, and reliable user interfaces
- Define best practices for integration with RESTful APIs and back-end services
- Drive performance, scalability, reliability, security, and maintainability across front-end applications
- Establish and promote engineering standards for code quality, testing, documentation, and development practices
- Define automated testing strategies, standards, and coverage goals
- Lead technical reviews and contribute to the resolution of complex engineering challenges
- Collaborate closely with back-end engineers, UX/UI designers, system engineers, and other stakeholders to define robust technical solutions
- Mentor senior and less experienced engineers and support their technical development
- Identify opportunities to improve engineering practices, development processes, tooling, and front-end technologies
Requirements
- 10+ years of experience in Front-End Development, with demonstrated experience in technical leadership and architectural decision-making
- BSc degree in Computer Science, Electrical/Electronics Engineering, or a related field
- Deep expertise in React and its ecosystem
- Advanced proficiency in JavaScript (ES6+), TypeScript, HTML5, and CSS3
- Strong experience with state management solutions such as Redux, Zustand, or React Query
- Proven experience designing and evolving scalable, complex, and maintainable front-end architectures
- Strong hands-on experience with automated testing frameworks such as Jest, React Testing Library, Cypress, or Playwright
- Strong understanding of REST APIs, asynchronous programming, and client-side integrations
- Strong knowledge of front-end performance optimization, secure coding practices, accessibility, and design patterns
- Experience defining technical standards and driving engineering best practices across development teams
- Strong understanding of CI/CD workflows and modern software development practices
- Demonstrated ability to provide technical mentorship and influence engineering decisions across teams
- Excellent communication, collaboration, and problem-solving skills
- Fluency in English