Senior Frontend React Developer - AI-Powered Applications

About the Role

We're hiring a Senior Frontend React Developer to join our dynamic team at Shelf, where you will play a crucial role in crafting interfaces that make enterprise AI accessible and trustworthy. As a Senior Frontend React Developer, you will be responsible for building production-ready Next.js applications that handle high-load scenarios and real-time AI interactions. This is an exciting opportunity to work with cutting-edge technology and contribute to the AI revolution.

What You'll Do

• Design and implement production-ready Next.js SSR applications with complex state management, handling high-load scenarios and real-time AI interactions at scale.
• Build interfaces for AI-powered features including streaming LLM responses, semantic search across millions of documents, and interactive knowledge graphs.
• Architect component libraries and maintain our design system in Storybook, ensuring reusability and accessibility across the platform.
• Develop enterprise-grade functionality including multi-language support, accessibility compliance, and security implementations that meet SOC 2 standards.
• Create comprehensive technical specifications and component API designs that clearly communicate interface decisions and performance trade-offs.
• Optimize data-heavy UIs using React Flow for node-based graphs and Highcharts for analytics visualizations.
• Instrument components for performance monitoring and build automated visual regression tests with Playwright.
• Integrate with backend services via REST APIs and handle websocket connections for real-time updates.

Requirements

• Over 5 years of professional frontend engineering experience, including more than 3 years specializing in React and modern JavaScript/TypeScript.
• Production Next.js experience - you've built and shipped SSR applications at scale.
• Deep TypeScript expertise - you write type-safe code with generics and utility types.
• Hands-on experience architecting state solutions for real-time collaboration and large-scale data synchronization.
• Experience building applications with localization, accessibility, and security best practices.
• Proven track record optimizing applications for performance under heavy traffic.
• Strong expertise with Tailwind CSS and/or CSS-in-JS solutions.
• Upper-Intermediate or better English skills for technical communication.

Nice to Have

• Experience with React Flow, Highcharts, or other complex data visualization libraries.
• Familiarity with observability and monitoring tools like Datadog or Sentry.
• Experience with AI coding assistants (OpenAI Codex, Claude, etc.).

What We Offer

• B2B contract with competitive salary.
• Company stock options.
• Hardware: MacBook Pro.
• Modern technical stack and premier AI development environment.
• Opportunity to work on meaningful projects that impact the future of AI.