Freelance Développeur Front-End / React - Spécialiste Design System H/F
€550 per dayAquent France
Senior Design System Engineer
Type of position: Temporary
Compensation: 550 € Daily
Start date: June 2026
Aquent is looking for a freelance Senior Design System Engineer 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 the 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 architecture of the Next.js ecosystem 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’s internal mechanics, multi-versioning management (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 Storybook library for a small project is not sufficient for this position.
- AI & Automation (Mandatory): Strong curiosity and willingness to use AI on a daily basis. The group actively uses AI to automate its workflows, and an open-minded attitude towards these tools is a disqualifying criterion.
- Secondary Hard Skills: Advanced TypeScript, Storybook, testing tools.
- Fluent / Operational English Mandatory: International team, daily meetings are conducted 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.
Vacancy posted 4 days ago
Similar jobs that could be interesting for youBased on the Freelance Développeur Front-End / React - Spécialiste Design System H/F in United States vacancy
$170k - $240k
...Hex is looking for a Design Engineer to lead the evolution of their product design system, Spellbook. This role involves architecting and... ...should have 7+ years of experience in front-end engineering, particularly with Typescript and React, demonstrating a strong design...ReactFront endHEX
San Francisco, CA1 day ago$180k - $210k
...Network is looking for a Product Designer in San Francisco. The role focuses... ...building and evolving the UI design system while collaborating tightly with... ...teams. The ideal candidate has strong front-end expertise, specifically with React and TypeScript, and experience...ReactFront endCrypto Pro Network
San Francisco, CA1 day ago- ...Platforms Inc. is searching for a Designer Engineer to create user-... ...requires proficiency in design and front-end engineering, allowing for the... ..., experience with tools like React and Tailwind is a bonus,... ...to Daytona's innovative design system. #J-18808-Ljbffr...ReactFront end
Daytona Platforms Inc.
New York, NY1 day ago - ...Front End Developer Location: Phoenix, AZ onsite Contract Role Name: Developer... ...have extensive hands-on experience in React JS. Should have extensive hands-on experience... ...have extensive hands-on experience in Design Language System (DLS 6) to prepare more cohesive UI...ReactFront endContract work
Syntricate Technologies
Phoenix, AZ5 days ago $180k - $210k
...in San Francisco is seeking a Product Designer. In this role, you'll create high-quality... ...prototypes and help evolve the design system. The ideal candidate will have a strong foundation in front-end development, especially with React and TypeScript, and an eye for design...ReactFront end- ...Principal Backend Engineer to lead the design, architecture, and maintenance of scalable backend systems. The role involves mentoring... ...will have over 5 years of front-end development experience and be proficient in technologies like React, TypeScript, and Figma. A collaborative...ReactFront end
- ...located in San Francisco, is seeking a Design Engineer to own the product’s interface and the design system in code. You will partner with... ...for candidates with significant front-end experience, fluency in essential technologies like React and TypeScript, and a portfolio...ReactFront end
- ...Job Title: Design System Engineer (UI/UX Engineer) Location: Sunrise, FL (hybrid 3 days... ...term contract Key Skills: UI/UX, React and JavaScript/TypeScript, HTML, CSS, web... ...Strong expertise in * HTML, CSS, and modern front-end development practices * # Proven...ReactFront endLong term contract
Inficare
Fort Lauderdale, FL20 hours ago - A tech-driven design firm in New York is seeking a Product Designer who will... ...of an AI-native design system. This role involves creating scalable, React-based design solutions, collaborating... ...technical skills in user experience and front-end development. The firm offers...ReactFront end
- SAS is seeking a Senior Software Developer for its Design Systems team, based in Cary, North Carolina or remote in the... ...purchase experiences. The ideal candidate has 8+ years of front-end development experience, strong React knowledge, and a deep understanding of design...ReactFront endRemote job
$200k - $350k
...company in San Francisco seeks a Design Engineer to enhance product UX and... ...experiences, and implementing design systems. Candidates should have over 4... ...design engineering, along with strong front-end skills in Typescript, Node, and React. Competitive compensation ranges...ReactFront end- ...Design Systems Designer Design Systems Designer Location: New York, NY Design Systems... ...Engineering Collaboration Collaborate with front-end engineers to ensure consistent design-... .... Design with awareness of React component structures and responsive design...ReactFront endFull timeContract workLocal areaRemote work
ESR Healthcare
New York, NY1 day ago $170k - $240k
...role Hex is looking for a thoughtful, systems-minded Design Engineer to lead and own the next evolution... ...you have: 7+ years of experience in front-end engineering or design engineering,... ...technologies, especially Typescript, React, component-driven architectures, and accessibility...ReactFront endFlexible hoursHEX
San Francisco, CA3 hours ago- Intuit is looking for a Staff Design System Engineer in New York, New York. This role involves owning the technical vision... ...The ideal candidate will have extensive knowledge of front-end technologies such as React and TypeScript, experience with performance optimization...ReactFront end
$170k - $200k
...is looking for a Senior Product Designer to help own and evolve our design system - the shared components, patterns... ...closely with our product design and front-end engineers to design, spec, and... ...constraints and possibilities of React, CSS, and the DOM Care deeply...ReactFront endHourly payFlexible hoursSentry
San Francisco, CA3 days ago- ...Role - Design System Engineer (UI/UX Engineer) Location - Sunrise, FL hybrid 3 days onsite... ...accessible, reusable components using React. In this role, you'll help design,... ...Strong expertise in * HTML, CSS, and modern front-end development practices * # Proven...ReactFront end
Inficare
Fort Lauderdale, FL2 days ago $74.6k - $124.4k
...practices for our Enterprise Design Systemteam. This role is responsible... ...inclusive practices into system components and patterns, and enabling... .... Working knowledge of front-end technologies (HTML, CSS, and... ...front-end ecosystems(e.g.,React, Angular, Lit). Experience...ReactFront endWork experience placementM&T Bank
Buffalo, NY1 day ago- Ramp is seeking an experienced front-end engineer to lead implementation of complex... .... You will work closely with designers to enhance Ramp's brand design system and create engaging user experiences... ...end development, strong skills in React and CSS, and a portfolio...ReactFront endFlexible hours
- Responsibilities Design System Ownership: Lead the evolution, documentation, and adoption of Deel's design system. Maintain and... ...component library and underlying framework architecture Front‑end experience (React, TypeScript) and understanding of design‑token‑driven development...ReactFront endRemote work
- ...currently looking for a Staff Product Designer - Design Systems in Germany. This is an exciting opportunity... ...the integration between design and front-end development. Drive adoption of the... ...technologies such as HTML, CSS, JavaScript, and React, with experience collaborating closely...ReactFront endRemote jobSecond jobLocal areaWorldwideHome office
$124.6k - $234.25k
...you passionate about solving design problems at scale, and crafting... ...Foundations and work on the design system. Your work will ultimately... .... Working knowledge of front-end technologies (HTML, CSS, JavaScript, or frameworks like React) and how design systems are...ReactFront endTemporary workLocal areaWorldwideFlexible hoursAdobe
San Francisco, CA4 days ago$95k - $209k
...Are you a highly experienced Front-End Developer with a passion for building robust and scalable design systems? Do you thrive on creating elegant and efficient solutions that... ...front-end frameworks, including Angular and React. ~ Mastery of CSS, including pre-processors...ReactFront endTemporary workBNY Mellon
New York, NY1 day ago- ...you passionate about solving design problems at scale, and crafting... ...Foundations and work on the design system. Your work will ultimately... ...levels. Working knowledge of front-end technologies (HTML, CSS, JavaScript, or frameworks like React) and how design systems are...ReactFront endFlexible hours
- ...BetterUp is looking for a Staff Product Designer, Design Systems to own, evolve, and scale our... ...What You'll Do Own the end-to-end strategy, architecture, and... ...tools ~ Strong understanding of front-end technologies (HTML, CSS, React or similar frameworks) and how...ReactFront endWork experience placementSummer holidayLive outLocal areaRemote workFlexible hoursShift work
BetterUp
United States5 days ago $202.5k - $274k
...looking for a creative and enthusiastic Staff Design System Engineer to join our Design Technology... ...-centric design. Unlike a traditional front-end role focused on building individual... ...affect multiple teams. Expert knowledge of React, TypeScript, Git, Figma, and component documentation...ReactFront endIntuit
Mountain View, CA3 hours ago$186.25k - $208.96k
...Staff Product Designer, Design Systems (Hybrid - 2 to 3 days onsite per week) Overview:... ...visual precision, fidelity, accessibility (React Aria), and interaction quality, motion... ...'ve accomplished: ~7+ years in front-end, design, or creative engineering, with...ReactFront endFull timeTemporary workLocal areaWorldwideFlexible hoursShift work2 days per week3 days per weekWeedmaps
Austin, TX5 days ago$164k - $246k
...Staff Product Designer - Platform/Design Systems FloQast is at the forefront of the accounting industry... ...Architecture: Partner directly with Front-End Engineering Leads and Leadership to... ...end development technologies (e.g., React, HTML/CSS) sufficient to influence technical...ReactFront endWork at officeWorldwide3 days per weekFloQast
Los Angeles, CA3 days ago$97.3k - $175.5k
...role builds and evolves the AI-powered design system that supports digital products across Mint... ..., build, and contribute to the initial front-end implementation of complex UI patterns, components... ...in Figma, HTML, CSS, JavaScript, React and Storybook. Excellent...ReactFront endFull timeTemporary workPart timeWork experience placementLocal areaFlexible hoursT-Mobile
Frisco, TX4 days ago$220k - $276k
BetterUp is looking for a Staff Product Designer, Design Systems to own, evolve, and scale our... .... What You'll Do Own the end-to-end strategy, architecture, and... ...design tools Strong understanding of front-end technologies (HTML, CSS, React or similar frameworks) and how...ReactFront endSummer holidayLocal areaFlexible hoursShift work- ...Included What you’ll do Build Confido’s design system from the ground up—tokens, components,... ...developers alike. Implement production‑grade React/TS components with pixel‑perfect... ...bring 4+ years of design engineering or front‑end experience, ideally on a product or design...ReactFront endLocal areaRelocation packageNight shift
Do you want to receive more vacancies?
Subscribe and receive similar vacancies to Freelance Développeur Front-End / React - Spécialiste Design System H/F. Be the first to apply!
Related searches
- freelance java developer United States
- freelance content writer United States
- psychiatry moonlighting United States
- online freelance graphic designer United States
- freelance medical copywriter United States
- freelance copy editing United States
- freelance product photographer United States
- freelance translator no experience United States
- freelance web designer United States
- freelance project manager United States