Senior Frontend Engineer (JavaScript / React)Location : This role is located Paris 2 - Requires to come at the office 2 times a week minimum - Not open to full remote
As a Front End Developer, you will be responsible for designing, developing, and maintaining the client-side components, user interfaces, and user experience of our software applications. This role requires deep expertise in front-end technologies and the ability to build performant, accessible, and scalable user interfaces while collaborating effectively within an agile team environment.
You will work closely with Engineering Managers, Product Managers, Back End Developers, Designers, and other team members to implement features, improve application architecture, and ensure high-quality deliverables that meet both technical and business requirements. Curious by nature, you won’t hesitate to dive into back-end tasks when the context calls for it, bringing a full-stack mindset to the problems you tackle.
You will be part of a cross-functional squad and will contribute to technical decisions while maintaining high standards of code quality, performance, accessibility, and user experience.
Learn more about our Tech Team through our Medium
Missions clés
You will design, develop, and maintain scalable React applications and reusable component libraries
You will build responsive and accessible user interfaces following design systems and UI/UX best practices
You will write clean, maintainable, and well-tested code following team standards and best practices
You will participate in code reviews and provide constructive feedback to team members
You will debug production issues and implement robust solutions
You will contribute to technical documentation and architecture decisions
You will integrate RESTful APIs and GraphQL endpoints into the front-end application
You will optimize application performance, bundle size, and loading times
You will implement state management solutions and client-side caching strategies
You will participate in agile ceremonies and technical planning sessions
You will actively participate within an autonomous mission team (PM, Designer, Engineering manager, Back End Developers) to clarify priorities and user needs
You will contribute to technical discussions and architecture decisions
You will collaborate with designers to implement pixel-perfect, accessible interfaces
You will work with back-end developers to define API contracts and data structures
You will participate in squad rituals and team meetings
You will handle support requests and bug fixes within agreed SLAs
You will write unit tests, integration tests, and end-to-end tests following TDD principles
You will collaborate with QA team to ensure comprehensive test coverage
You will participate in pair programming sessions with team members
You will monitor application performance, Core Web Vitals, and implement improvements
You will follow accessibility standards (WCAG) and ensure inclusive user experiences
You will contribute to continuous integration and deployment processes
You will implement error tracking, monitoring, and analytics
You will ensure cross-browser compatibility and responsive design
You will optimize for performance: code splitting, lazy loading, image optimization
You’d be our ideal candidate if you:
Experience & Expertise
7+ years of professional front-end development experience
Strong expertise in modern web application architecture and React ecosystem
Technical Skills
Proficient in JavaScript/TypeScript, React (Hooks, Context, Router), and modern ES6+ features
Experienced with state management (Redux, Zustand, TanStack Query) and API integration (REST, GraphQL)
Skilled in CSS (Modules, Styled Components, Tailwind), build tools (Webpack, Vite), and testing (Jest, React Testing Library, Playwright, Cypress)
Knowledgeable in performance optimization, accessibility standards (WCAG, ARIA), responsive design, and design systems (Storybook)
Comfortable with Git, CI/CD practices, and modern development workflows
Soft Skills
Excellent problem-solving abilities with strong attention to detail
Effective communication in French and English, thriving in remote environments
Collaborative team player with product thinking and user-centric mindset
Proactive in suggesting improvements with a focus on maintainable, well-documented code
Passionate about user experience, accessibility, and inclusive design
Welcome to the Jungle aspires to have a positive social impact, and pays particular attention to respecting diversity, inclusion and equity.
Regardless of qualifications, we’re looking for a passionate individual who will fit in well with the team and take responsibility for these issues.