Freelance Développeur Front-End / React - Spécialiste Design System H/F
€550 - €600 per dayAquent France
Senior Design System Engineer
Type of position: Temporary
Compensation: 550 €-600 Daily
Start date: June 2026
Aquent is looking for a Senior Design System Engineer freelance – fluent in English – for one of its clients, an international group that pushes the boundaries of user experience.
The goal of this mission is highly strategic: to lead the maintenance, evolution, and scaling of their Design System.
Your Key Responsibilities
Within an international team, your missions will be:
- Advanced UI Engineering & Multiversion: Design, optimize, and evolve the components of the React and advanced TypeScript library. Manage front compatibility and migration to React 18 and React 19, as well as communication around breaking changes.
- Performance & Complex Ecosystem: Solve complex issues related to server-side rendering (SSR) and the Next.js ecosystem architecture used by dozens of consuming teams.
- Design-to-Code Alignment: Ensure perfect synchronization and parity between production code and the Figma environment (tokens, variables, library architecture).
- Innovation & AI Integration: Collaborate on the implementation of generative AI tools within the Design System (e.g., creating onboardings to allow non-technical profiles to generate code via the system).
- Support & Evangelism: Accompany and guide the community of internal developers who consume the library on an international scale.
Other Requirements
Profile sought
Indispensable Technical Skills:
- Absolute React Expertise: In-depth knowledge of React internals, multi-versioning (18 and 19), and SSR/Next.js issues.
- Large-scale Design System Specialization: You have already deployed, maintained, and documented a library/components consumed by multiple users and teams. Having created a simple isolated Storybook library for a small project is not sufficient for this position.
- AI & Automation (Mandatory): Strong curiosity and willingness to use AI daily. The group actively uses AI to automate its workflows, open-mindedness towards these tools is a disqualifying criterion.
- Secondary Hard Skills: Advanced TypeScript, Storybook, testing tools.
- Fluent English / Operational: International team, daily meetings are entirely in English.
- Resilience & Autonomy: Ability to evolve calmly and structured in a shared governance team context.
- Service Sense: Team spirit, clarity in the documentation of migrations and releases.
$180k - $210k
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