Freelancer profile translated to English.

Description

Passionate Frontend Developer, I design and optimize modern, performant, and intuitive interfaces to bring your web applications to life.

**My mission**: to transform your needs into fluid, aesthetic, and effective user experiences.

I support you throughout the frontend cycle: UI design, advanced component development, fine integration, rendering optimization, and continuous improvement.

My added value

In-depth expertise in React, Redux, AG Grid, TypeScript, design systems, and modern patterns

Development of complex components, dynamic interfaces, and data-driven dashboards

Great attention to performance, readability, accessibility, and user experience

Fluid collaboration with product, design, and backend teams for a perfectly aligned frontend

Types of projects I handle

Complete creation or redesign of interfaces in React

Development of custom components, advanced tables, complex forms

UI/UX optimization and frontend performance improvement

Implementation of maintainable and scalable frontend architectures

Integration of design systems and robust state management

**My goal**: to offer you a polished, modern, and performant frontend, while building a simple, transparent, and effective collaboration.

See you soon,

Léo

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Paris (up to 50km)

Elixir
Fullstack Developer
HEALTH AND WELLNESS
August 2024 - March 2025 (7 months)
Complete design and implementation: in-depth needs analysis, specification writing, technical choices, and architecture.

End-to-end development: implementation of front & back functionalities, integration of business services, performance optimization.
Quality & reliability: implementation of tests, bug fixes, continuous improvement.

Production release & monitoring: deployment, monitoring, and client support to ensure a stable and scalable product.
Python Django Agile methodology
Datakiss
Lead Frontend Developer
April 2022 - Today (4 years and 2 months)
Paris, France
Development and optimization of the Datakiss platform frontend, based on React, Redux, AG Grid, and a modern ecosystem of UI libraries.

Design of advanced components: creation of rich interfaces, management of complex business cases, continuous improvement of user experience.
Performance & robustness: rendering optimization, implementation of reliable data flows, structuring and evolution of the frontend architecture.

Cross-functional collaboration: close work with product and backend teams to deliver intuitive, consistent, and user-centered interfaces.
React.js Node.js GraphQL Agile methodology Antd
Linguaphone NT
Fullstack Developer
EDUCATION AND E-LEARNING
October 2019 - August 2021 (1 year and 11 months)
Paris, France
Complete refactoring from scratch of the management, planning, and invoicing tool for platform users.

Design and development of end-to-end functionalities: definition of backend architecture, creation of a modern and intuitive user interface, integration of business workflows, and performance optimization.
Modernization and scalability: implementation of best practices, improvement of ergonomics, system reliability, and preparation for future extensions.
Vue.js Symfony 5 GraphQL PHP Gitlab CI

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Master in Web Engineering
ESGI
2020
Technologies Web, Frameworks, Méthodologie, Gestion de projet, Communication, Web Design, UX/UI, SEO PHP / JS / Python / Ruby / MySQL / Git

Léo Wattier

Front-end Developer Vue.js & React.js

About Léo

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