
Sean Roennau-Wergen
Front-End Developer
Salary / Daily rate
Paris, France
Mobility: Paris
Freelance, open to permanent contract
Can come onsite
Skills
Languages
About me
Intro
Previously a language teacher, now a front-end developer with expertise in React, HTML/CSS, and JavaScript, with recent experience developing reactive interfaces at Abeille Assurances. Specialised in pixel-perfect UI/UX integration, Design System management, and performance optimisation. I deliver cross-platform consistent solutions with strong focus on accessibility and responsive design.
Work experience
Frontend Developer
Abeille Assurances
Oct 2023 - Oct 2025
2 years 1 month
92270 Bois-Colombes, France
UI Component Creation: Development of reactive interfaces using HTML, CSS, JavaScript, and Angular, with a constant focus on performance, accessibility, and cross-platform consistency. Design System Evolution: Updating and enriching the internal Design System following the creation or modification of components. Pixel-Perfect Integration: Faithful translation of UX/UI mockups into HTML/CSS code, with fine-tuned styling adjustments based on functional or responsive needs. Technical Collaboration: Regular exchanges with back-end developers and product teams to ensure proper implementation of mockups and overall coherence. Debugging & Optimization: Identifying and resolving integration issues, particularly those related to responsiveness or unexpected behaviors. A/B Testing: Continuous improvement of user journeys through targeted DOM manipulations in JavaScript as part of A/B testing campaigns.
Business English Trainer
ÉLYSÉES LANGUES
Sep 2019 - Mar 2023
3 years 7 months
Paris, France
Teaching one-to-one or in a group of corporate personnel at the centre, at the clients' place of work or via videoconference. Levels: Absolute beginner to advanced. Pedagogy prioritised on grammatical precision, oral practice and targeted situations.
TOEIC English Teacher
Supméca – Institut supérieur de mécanique de Paris
Feb 2020 - May 2021
1 year 4 months
Teaching a group of aspiring engineering students in preparation for their TOEIC exams. Self-developed interactive pedagogy that was suitably adapted to both the physical and virtual classroom. Marking and grading of assignments.
Education
OpenClassrooms
RNCP Niveau 6
2023 - 2025
2 years 1 month
Nottingham Trent University
Bachelor of Arts - BA
2013 - 2017
5 years
Beijing Language and Culture University
Graduated
2016 - 2016
1 year
University of Potsdam
2015 - 2016
2 years
Licenses & certifications
Responsive Design
Issued: Aug 2023
Portfolio
