Senior Frontend Engineer (Web-first, Cross-Platform)

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Frontend Engineer (Web-first, Cross-Platform) in the United States.

This role is an exciting opportunity to lead frontend development for high-traffic, cross-platform applications, focusing on fast, discoverable, and performance-optimized web experiences. You will primarily work in React with a mixed-rendering environment, shaping rendering strategies, Core Web Vitals, and SEO-friendly implementations. Collaborating closely with mobile engineers and product teams, you will help features move seamlessly between web and mobile platforms. You will also operate in an AI-augmented environment, using agents to accelerate development, testing, and optimization. This position combines hands-on engineering, architectural influence, and performance leadership in a flexible, innovative environment that values measurable impact.

As a Senior Frontend Engineer, you will design, build, and optimize web-first features while contributing to cross-platform initiatives:

• Develop and ship production-ready features in React (SPA) with TypeScript.
• Contribute to Astro-based static and mixed-rendering architecture, optimizing SSR, SSG, and hydration workflows.
• Implement performance improvements that enhance Core Web Vitals (LCP, CLS, INP) and overall user experience.
• Apply technical SEO best practices, including metadata, structured data, and crawl-safe patterns.
• Collaborate with mobile engineers to move features across platforms and handle performance-sensitive native integrations.
• Use AI agents to assist with component generation, testing, and performance optimization.
• Participate in code reviews, architectural discussions, and iterative shipping with a focus on measurable results.

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Requirements:

The ideal candidate brings strong frontend expertise, cross-platform awareness, and familiarity with AI-augmented workflows:

• 3+ years of experience building production web applications with React and TypeScript.
• Deep understanding of rendering models: CSR, SSR, SSG, and hydration.
• Experience optimizing performance-sensitive surfaces and improving Core Web Vitals.
• Familiarity with technical SEO concepts, including indexability, structured data, and crawl behavior.
• Ability to navigate and contribute to existing codebases independently.
• Experience directing AI agents for frontend work is a strong plus.
• Willingness to work across web and mobile surfaces when required.
• Nice to have: experience with Astro or other mixed-rendering frameworks (Next.js, Remix), React Native, native iOS/Android development, high-traffic consumer products, or experimentation-heavy environments.

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Benefits:

• Competitive salary range: $170,925 – $201,088 USD.
• Fully remote work across the United States.
• Comprehensive healthcare, dental, and vision coverage.
• Paid federal holidays and flexible time off.
• Opportunities to contribute across web and mobile platforms, with influence on architectural decisions.
• Collaborative and inclusive work environment, valuing diversity, learning, and innovation.
• Participation in AI-augmented workflows to accelerate engineering productivity and impact.