Senior Frontend React Engineer

Responsibilities:

• Develop and maintain customer-facing features across E! Online.
• Help execute the React 16 → React 18.3 → React 19 modernization roadmap.
• Upgrade React-facing dependencies, including Apollo Client, Helmet, intersection observers, and UI libraries.
• Maintain server-side rendering and browser hydration behavior.
• Diagnose and resolve hydration mismatches, rendering failures, race conditions, and browser-specific issues.
• Build regression coverage for critical routes and user journeys.
• Maintain GraphQL queries and Apollo Client cache behavior.
• Develop and support article, gallery, video, livestream, navigation, poll, newsletter, and CMS-driven experiences.Integrate and troubleshoot advertising

Required qualifications:

• Strong professional experience developing production React applications.
• Advanced JavaScript, HTML, and CSS skills.
• Experience working with hooks, context, component lifecycles, and error boundaries.
• Experience with server-rendered React applications or similar SSR frameworks.
• Strong understanding of hydration and server/browser rendering differences.
• Experience with GraphQL and client-side caching.
• Demonstrated ability to write behavior-focused tests with React Testing Library.
• Experience diagnosing difficult production issues involving state, asynchronous behavior, APIs, or third-party integrations.
• Ability to modernize legacy code incrementally while controlling regression risk.
• Strong Git and pull-request review practices.
• Ability to communicate technical risks and tradeoffs clearly.
• Ability to work independently while collaborating effectively across teams.

Preferred qualifications:

• Experience migrating a large application between major React versions.
• Experience with media, publishing, entertainment, or other content-heavy platforms.
• Familiarity with video players, live streaming, playlists, and advertising integrations.
• Experience with Apollo cache normalization and SSR cache hydration.
• Knowledge of technical SEO and structured metadata.
• Familiarity with OneTrust or other consent-management platforms.
• Experience with Adobe analytics, data layers, or comparable analytics systems.
• Experience supporting internationalized websites.
• Familiarity with accessibility standards such as WCAG.
• Experience with high-traffic, revenue-generating consumer applications.