Senior Frontend 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 currently looking for a skilled Senior Frontend Engineer to design, develop, and maintain modern web applications for mission-critical systems. The successful candidate will be responsible for building scalable and high-performance user interfaces, driving front-end architecture decisions, and collaborating with cross-functional teams to deliver reliable and intuitive solutions. Key Responsibilities Design, develop, and maintain responsive web applications using ReactBuild reusable and scalable components to support long-term maintainabilityTranslate UI/UX designs into high-quality, accessible user interfacesIntegrate front-end applications with RESTful APIs and back-end servicesOptimize application performance, reliability, and user experience across browsers and devicesCollaborate with cross-functional teams to deliver robust technical solutionsParticipate in code reviews and promote best practices, code quality, and maintainabilityDesign and evolve scalable front-end architectures, component libraries, and shared frameworksDefine testing strategies and contribute to automated testing standards and coverage goalsMentor team members and contribute to the continuous improvement of engineering practicesRequirements 5+ years of experience in Front-End DevelopmentBSc degree in Computer Science, Electrical/Electronics Engineering, or a related fieldStrong expertise in React and its ecosystemProficiency in JavaScript (ES6+), TypeScript, HTML5, and CSS3Experience with state management solutions such as Redux, Zustand, or React QueryExperience designing scalable and maintainable front-end architecturesHands-on experience with automated testing frameworks such as Jest, React Testing Library, Cypress, or PlaywrightStrong understanding of REST APIs, asynchronous programming, and client-side integrationsExperience with performance optimization, secure coding practices, and front-end design patternsFamiliarity with CI/CD workflows, code reviews, and modern development practicesExcellent communication and collaboration skillsFluency in English What we offer Competitive remuneration packagePrivate Medical Insurance packageContinuous learning in new technologiesOpportunity to work in large-scale projects with talented people