Senior JavaScript Engineer (React.js)

Make retail great again through the power of technology! Intellias helps retailers provide consistent and customer-centric shopping experiences across all channels with disruptive retail tech solutions. Get on board and make your own contribution to the industry!

What project we have for you

With great experience come great projects. Just imagine: you can develop a product that should completely change the business of one of the world's largest companies!

Our client is an innovative global company from the Fortune 500. Consumer Goods Producer and Retailer with headquarters in Switzerland that sells its products in 130 countries. Intellias mission is to support its strategy and efforts in the Digital and eCommerce space.

A newly conceptualized Digital Eco System is comprised of a set of capabilities including an online shop & website, linking online & offline, customization & personalization, engagement & membership, digital products & services.

What you will do

• Creating technical vision & documentation
• Participate in architecture and design efforts
• Code review, code optimization
• Technical tasks implementation, design, refactoring
• Collaborate with other engineering teams to resolve dependencies and deliver high-quality software on time, etc.

What you need for this

Own the design and delivery of reliable frontend features across the Next.js application and shared packages. Collaborate closely with product, design, backend, and QA teams while helping the team make technical decisions.

Requirements

• Senior-level experience delivering production web applications, with 5+ years in frontend development.
• Strong experience with React, TypeScript, and modern Next.js, including App Router patterns and server/client rendering.
• Ability to design maintainable components and shared packages/APIs within a large monorepo.
• Experience integrating frontend applications with GraphQL and REST APIs, including generated types, loading and error states, and evolving backend contracts.
• Proficiency in responsive and accessible UI development using CSS Modules/SCSS, with the ability to work within an existing design system and follow design token conventions.
• Experience with frontend state management, such as Redux and React Context.
• Solid understanding of testing and quality practices, including Jest or Vitest, Testing Library, Storybook, and browser testing frameworks.
• Familiarity with monorepo tooling and CI quality gates, including linting, PR workflows, type checks, and builds.
• Strong debugging, code review, and written communication skills.
• Ability to take ownership of features through implementation, testing, release, and production follow-up.
• Experience using modern AI development tools to improve productivity, such as GitHub Copilot, Codex, or Claude Code.