Frontend Developer Jobs in Île-de-France, France

Lumo AI team at Proton builds a privacy‑first AI assistant that keeps user conversations confidential. As a Frontend Engineer you will turn UI mockups into production‑ready React components, integrate them with backend services using TypeScript, and optimize performance for fast, reliable user experiences.

Account Team at Proton builds the core user lifecycle capabilities across all Proton products, from acquisition to retention. The Frontend Engineer develops, deploys, and supports high-quality React/TypeScript user experiences, scopes and executes new features, and translates product specs into technical requirements.

Build high‑quality TypeScript/React UI for Adaptive ML’s RLOps platform, designing reusable component library, optimizing performance, accessibility, and robustness. Collaborate with backend and product teams to surface real‑time AI workloads and drive product roadmap.

Blaze Talent’s Frontend Engineering team builds a next‑gen social gaming platform that blends real‑time interaction, multiplayer features, and creator‑driven communities. The Senior Frontend Engineer will design, ship, and maintain responsive, high‑performance web components using Svelte/SvelteKit (React or Vue acceptable), turning Figma designs into production code and ensuring scalability for thousands of concurrent users.

Ecom Pricing & Promotions team at Decathlon Digital builds the global e‑commerce pricing and promotion platform to drive commercial dynamism and shopper experience. As a Senior Frontend Engineer you will design and evolve high‑performance, scalable web applications, co‑design architecture, enforce code quality through reviews and automated testing, and optimize CI/CD pipelines while mentoring junior developers.

Product-focused development team building innovative digital solutions for large-scale user communities. As a Frontend Developer, you will develop high-performance React applications, design scalable frontend architectures, and collaborate with cross-functional teams to deliver new features and improvements.

Signaloid Cloud Developer Platform team builds deterministic computing platforms for finance, robotics and manufacturing workloads. The Cloud Frontend Engineer creates new UI features, expands testing infrastructure and improves performance of the cloud developer portal, collaborating with backend, product and design.

Pass Team at Proton builds a secure, open-source password manager integrated across Proton's privacy-first ecosystem. The Senior Frontend Engineer develops new features for browser extensions, web and desktop apps, collaborates with backend, product, design and QA, conducts code reviews, and implements testing strategies.

Dust seeks an experienced frontend engineer to craft engaging, high‑performance user interfaces in React and TypeScript while also contributing to backend REST APIs with Next.js. The role blends design collaboration, accessibility, and performance optimization with a full‑stack perspective. Candidates will lead frontend projects, maintain a design system, and ensure code quality across the codebase.

We are seeking a talented Senior Frontend Developer to join our dynamic team and contribute to the development of innovative user interfaces for our core products, such as IQVIA's Health Data Research Platform. Responsibilities include maintaining and enhancing existing UIs, designing new interfaces, developing transfer layers, conducting code reviews, and writing unit and integration tests.

Staff Frontend Engineer at Vetcove leading architecture, design, and delivery of large‑scale React and React Native applications, defining frontend strategy, building shared component libraries, mentoring junior engineers, and driving performance and reliability improvements.

Senior Frontend Developer at Lyreco leads the Next Generation eCommerce frontend team, driving technical innovation, mentoring juniors, and ensuring clean code practices. Responsibilities include leading frontend implementation, providing technical consultation, code reviews, and building proof‑of‑concepts.

Security & IT – IT team builds next-generation financial applications powered by modern web technologies and blockchain infrastructure. The Senior Frontend Engineer crafts intuitive, secure, high‑performance user experiences, leads frontend architecture, and mentors engineers while collaborating with product, design, and backend teams.

Design System team builds a shared UI foundation powering multiple products. Senior Frontend Engineer creates scalable, accessible React components, design tokens and tooling, extending the system for AI‑assisted development.

International Product Engineering Team building a modern platform for property owners and managers worldwide. Senior Frontend Engineer will own end‑to‑end feature development, shape React‑based UI architecture, and collaborate with designers, product managers, and backend engineers to deliver performant, accessible user experiences.

Core Frontend Team at jobgether builds large‑scale, user‑facing web applications that connect millions globally. The Senior Frontend Developer designs scalable React solutions, refactors existing code, and optimizes performance while shaping frontend architecture.

Accounting Frontend Team at a leading SaaS platform builds a next‑generation trust accounting subsystem. The Senior Frontend Engineer designs and delivers scalable React/TypeScript interfaces for fund tracking, reconciliation, reporting and payments, defines architecture and component libraries, and ensures performance, accessibility and compliance.

Product Engineering team builds scalable, high-performance frontend systems for modern SaaS infrastructure. The Senior Frontend Engineer owns a complex developer-facing application, designs and ships robust features, shapes frontend architecture, and maintains a design system while improving observability.

C2 Core team at Harmattan AI builds the Human-Machine Interface for a tactical Command and Control system, delivering real-time battlefield visualizations for operators. The Frontend Engineer creates interactive maps, low‑latency video grids, and mission planning tools while ensuring 60fps performance and robust state management.