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Frontend Developer

Haystack

$132,000 - $222,100
Dec 1, 2025
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eBay's Seller Experience team needs to build high-performance, visually rich, highly interactive web applications at global scale to help over 25 million sellers onboard, manage, and grow their businesses worldwide.

Requirements

  • Expert-level experience with HTML5, CSS3, LESS/SASS, JavaScript/TypeScript, and Ajax.
  • Advanced experience building server-side web applications in Node.js.
  • Experience with cross-browser UX, site speed optimisation, accessibility, and performance tuning.
  • Hands-on experience with automated testing (unit, component, UI/visual).
  • Improve browser performance using IndexedDB, Web Workers, and modern web capabilities.
  • Integrate with backend APIs and optimise performance in both browser and Node.js environments.
  • Implement and manage CI/CD pipelines (Jenkins, Git) and testing frameworks.

Responsibilities

  • Work with engineers, designers, and PMs to build high-quality, high-performance frontend applications.
  • Develop and maintain web applications using JavaScript/TypeScript, HTML, CSS, Node.js, and component template languages.
  • Build responsive, cross-browser, cross-platform UI with smooth interactions.
  • Improve browser performance using IndexedDB, Web Workers, and modern web capabilities.
  • Design reusable UI components, internal tools, and frontend development frameworks.
  • Integrate with backend APIs and optimise performance in both browser and Node.js environments.
  • Write automated tests using tools such as Playwright and Percy.

Other

  • 10+ years designing and building large-scale, interactive frontend applications.
  • Strong CS fundamentals – data structures, algorithms, system design.
  • Ability to architect systems, lead technical discussions, and influence frontend engineering direction.
  • Portland, OR - Hybrid