Senior Front-End Engineer

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. Our high-performing, dynamic, and collaborative environment fosters professional growth at every stage.

Quento Technologies S.A. seeks a highly motivated and experienced Senior Front-End Engineer to design, build, and evolve secure, high-quality web applications using modern React and Next.js technologies. You will play a key role in delivering scalable, accessible, and maintainable digital experiences, while collaborating closely with product, design, back-end, and platform engineering teams.

This role is ideal for an engineer with strong hands-on experience in TypeScript, a solid understanding of server-state management and authentication, engineering quality, and excellent user experience.

Your responsibilities will entail:

• Design, develop, and maintain responsive, scalable, and production-ready web applications using Next.js 15, React, and TypeScript;
• Build reusable UI components and front-end modules that support consistency, maintainability, and efficient delivery;
• Manage server state, caching, synchronization, and asynchronous data flows (i.e. TanStack Query);
• Implement secure authentication and authorization flows using Microsoft Authentication Library (MSAL);
• Create robust, accessible forms and schema-based validation (i.e. React Hook Form with Zod);
• Translate UI/UX designs and business requirements into high-quality, responsive interfaces (i.e. Tailwind);
• Integrate front-end applications with REST APIs and generated API clients, ensuring reliable error handling and clear loading states;
• Optimize application performance, rendering behavior, accessibility, and cross-browser compatibility;
• Write clean, maintainable, testable, and well-documented code in line with agreed engineering standards;
• Participate in code reviews and contribute to front-end architecture, technical decisions, and continuous improvement;
• Collaborate with cross-functional teams, including product owners, UI/UX designers, back-end engineers, QA, and DevOps specialists;
• Support automated build, quality, and deployment processes within Azure DevOps'
• Ensuring that all activities and duties are carried out in full compliance with regulatory requirements and supporting the continued implementation of the Group Anti-Bribery and Corruption Policy.

• University degree in Information Technology, Computer Science, Engineering, or a related field;

• Minimum of 5 years of professional experience in front-end software development;
• Experience with Next.js 15 and modern React development patterns, including BFF (Backend-for-Frontend) architecture and SPA (Single Page Application) development;
• Hands-on experience with server-state management and API-driven applications;
• Practical experience implementing authentication and authorization with MSAL;
• Strong understanding of component design, hooks, routing, rendering strategies, and state management;
• Experience integrating and consuming REST APIs;
• Solid knowledge of responsive design, accessibility, performance optimization, and cross-browser compatibility;
• Strong experience with Git workflows, pull requests, and peer code reviews;
• Experience working in an Agile delivery environment;
• Excellent problem-solving, collaboration, and written and verbal communication skills in English.

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 - QUALCO Group, before the submission of your application.