I
Intellias
Senior JavaScript Engineer (React.js)
Skills
NextReactTypescriptTesting & QAGraphQLAIGitHubJavascript
13 days ago
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Important information
Contract type:
Permanent
Location:
Poland
Work mode:
Onsite
Published on:
7 October 2026
What they need
- Requirements:
- 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.
- Responsibilities:
- 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
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