Senior Front End Engineer- Mobile & Web

At Quento Technologies S.A., the ICT arm of the Qualco Group, we deliver comprehensive and innovative solutions across AI, Digital Engineering, Cloud, and Cybersecurity, helping businesses accelerate digital transformation. With a presence in Greece, Luxembourg, and Belgium, and backed by the expertise of the Qualco Group, we combine deep technical knowledge with strategic partnerships to support business growth.

At Quento Technologies S.A. we empower our people to innovate and lead in delivering transformative ICT solutions to our clients worldwide. Quento Technologies S.A. seeks a highly motivated and experienced Senior Frontend Engineer to build and maintain high-quality web and mobile applications. You will work across iOS, Android, and Web, contributing to production-grade applications and delivering seamless user experiences.

This role is ideal for someone experienced in modern frontend development, mobile deployment processes, and cross-platform debugging, with a strong focus on code quality and performance.

Your responsibilities will entail:

• Develop and maintain web applications using React
• Build and ship production-ready mobile applications using React Native
• Manage mobile app deployment for iOS and Android, including build, signing, and store submission
• Integrate applications with REST APIs
• Implement responsive design for multiple screen sizes and devices
• Handle push notifications, deep linking, and app permissions
• Participate in code reviews before every merge
• Debug issues across web, iOS, and Android platforms
• Collaborate with cross-functional teams including backend, product, and design
• Manage application state using appropriate state management solutions

• University degree in IT or related field;
• 4–5 years of professional frontend development experience
• Experience with React Native in production mobile apps
• Experience with React for web applications
• Experience with iOS build, signing, and App Store deployment using Xcode
• Experience with Android build, signing, and Google Play deployment using Android Studio
• Ability to write and debug basic native code in Java or Objective-C
• Strong knowledge of React concepts including components, hooks, and state management
• Experience integrating with REST APIs
• Solid understanding of responsive design
• Experience with Git workflows
• Proficiency with VS Code or similar IDE
• Strong debugging skills across platforms
• Experience working in an Agile environment
• Experience on the following is desirable:
• Experience with Redux, Zustand, or Context API for state management
• Familiarity with React Query or Axios
• Experience with Jest or Detox for testing
• Knowledge of TypeScript
• Experience with CI/CD pipelines such as Fastlane or GitHub Actions
• Familiarity with Jira/Azure DevOps

Your Life @ Qualco Group
On top of challenging work environment, we are offering:

💸 Competitive compensation, ticket restaurant card, and annual bonus programs
💻 Cutting-edge IT equipment, mobile and data plan
🏢 Modern facilities, free coffee and beverages, indoor parking, and company bus
👨‍⚕ Private health insurance, onsite occupational doctor, and workplace counselor
🏝️ Flexible working model, hybrid benefits & home equipment benefits
🤸‍♂️ Onsite gym, wellness facilities, and ping pong room
💡 Career and talent development tools
🎓 Mentoring, coaching, personalized annual learning and development plan
🌱 Employee referral bonus, regular wellbeing, ESG and volunteering activities

Your race, gender identity and expression, age ethnicity or disability make no difference in Quento Technologies S.A. We want to attract, develop, promote, and retain the best people based only on their ability and behavior.

Disclaimer: Quento Technologies S.A. collects and processes personal data in accordance with the EU General Data Protection Regulation (GDPR). We are bound to use the information provided within your job application for recruitment purposes only and not to share these with any third parties. For more details on the processing of your personal data during the Recruitment procedure, please be informed in the Recruitment Notice, before the submission of your application.