Freelancer profile translated to English.

Description

Front-End Developer specialized in UI integration and React, with three years of experience. I design and integrate clean, responsive, and accessible interfaces, precisely following mockups and front-end best practices. Whether using HTML/CSS/JavaScript or React, I enjoy transforming a design into a fluid, coherent, and performant experience. I work with rigor, communicate clearly, and take the time to understand the need before coding. My goal is simple: deliver a fast, reliable, and user-friendly interface.

Languages

English
Native or bilingual
French
Fluent
German
Fluent

Workplace preferences

Can work on-site

Puteaux (up to 50km)

Abeille Assurances
Front-End Developer / Web Integrator
BANKING AND INSURANCE
October 2023 - September 2025 (1 year and 11 months)
Bois-Colombes, France
Build and maintain several dozen reusable components integrated into the group's Design System, deployed on 5 production sites, contributing to interface standardization.
Integrate complex mockups and refactor navigation as well as several layouts, allowing for an improvement in perceived performance and Lighthouse score (up to +25 points depending on the pages).
Reorganize resource and code architecture through migration to a new internal platform, contributing to reducing technical debt, limiting duplication, and improving asset accessibility.
Develop interactive components in JavaScript and ensure a consistent cross-device user experience, with a reduction in cross-browser and responsive UI anomalies.
Optimize user journeys through A/B tests and analyze results with UX teams, contributing to an improvement in engagement and conversion rates (~+2 to +5%).
HTML/CSS/JS digital-transformation Responsive Web Design Integration Git CI/CD
SUPMECA
English Teacher (TOEIC)
EDUCATION AND E-LEARNING
January 2020 - April 2021 (1 year and 3 months)
93400 Saint-Ouen-sur-Seine, France
Design structured and accessible educational content, adapting the presentation to the learners' needs.
Develop clear, direct, and results-oriented communication — useful for effectively collaborating with product teams.
Support students in solving complex problems methodically and iteratively.
Communication and Pedagogy Rigor and Organization Time Management teamwork Collaboration
Elysées Langues
Professional English Trainer
EDUCATION AND E-LEARNING
September 2019 - March 2023 (3 years and 6 months)
Paris, France
Explain technical concepts in a simple and precise manner, a key skill for documenting and presenting front-end work.
Collaborate with professionals from different sectors, quickly understanding their constraints and objectives.
Design personalized learning paths, transferable to the creation of interfaces adapted to varied user needs.
Independent Work Adapted Pedagogy Oral Presentation Communication Time Management

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M1 Software Designer Developer RNCP (Master's degree +6)
OpenClassrooms
2025
Développeur JavaScript/React
Bachelor of Arts
Nottingham Trent University
2017
Bachelor of Arts

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Sean Roennau-Wergen

Front-End Developer specialized in UI integration

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