Senior​/React Frontend Engineer

Senior/Staff React Frontend Engineer
Why Nuclearn.ai

Nuclearn.ai builds AI-powered software for the nuclear and utility industries—tools that keep critical infrastructure reliable, efficient, and safe. Our software integrates AI-driven workflow, documentation, and research automation, and is already used at 60+ nuclear reactors across North America. You'll ship production code operators and engineers rely on every day.

We're growing quickly, expanding our team and our Phoenix HQ. The work is consequential: what you build helps real plants run safer and smarter.

Eligibility: U.S. citizenship or permanent residency (green card) is required due to DOE export compliance.

• Architect scalable frontend systems that handle complex data workflows and real‑time updates
• Build sophisticated data visualizations that make ML model outputs interpretable and actionable
• Design and implement component libraries that balance flexibility with consistency
• Optimize performance for data‑heavy applications while maintaining excellent UX
• Collaborate deeply with backend engineers, data scientists, and domain experts to translate complex requirements into elegant interfaces
• Establish frontend standards and drive technical decisions across the engineering team
• Mentor engineers and elevate the entire team's frontend capabilities
• Ship features end‑to‑end from concept to production, owning the quality and user experience

• Building real‑time monitoring interfaces used in mission‑critical nuclear operations
• Designing complex, high‑dimensional ML visualization components that make automated insights actionable
• Establishing a robust frontend architecture and shared component system that scales with the engineering team

Technical Excellence

• 7+ years building production web applications with deep expertise in React and modern JavaScript/Type Script
• Mastery of state management patterns (Redux, Zustand, React Query, Context, etc.)
• Strong computer science fundamentals, including performance optimization and debugging complex systems
• Experience architecting large‑scale applications designed for long‑term maintainability
• Proficiency with modern tooling (Vite/Webpack, testing frameworks, CI/CD)

Product Mindset

• You think beyond implementation—asking why and should we as often as how
• Experience collaborating with designers, or designing interfaces yourself when needed
• Track record of creating intuitive, delightful user experiences
• Comfortable making pragmatic tradeoffs in ambiguous and fast‑changing environments

Communication & Leadership

• Ability to explain complex technical decisions to non‑technical stakeholder
• Experience mentoring engineers and performing thoughtful code reviews
• Skilled at driving consensus and influencing technical direction
• Thrive in a collaborative, fast‑paced startup environment

Self‑Directed Impact

• Able to contribute independently within 6 weeks
• High degree of ownership and ability to drive problems end‑to‑end
• Proactively identifies improvements and executes on them

• Experience with data visualization libraries (D3.js, Recharts, Plotly, etc.)
• Background in complex domains (scientific, industrial, financial, healthcare)
• Contributions to open source or technical writing
• Experience with WebGL, Canvas, or high‑performance graphics
• Knowledge of accessibility (WCAG) and building inclusive interfaces
• Full‑stack capabilities or strong understanding of backend systems
• Prior startup experience or leading engineering initiatives

• Improve the reliability and usability of interfaces used daily at nuclear power plants
• Shape the foundation of our shared component library & frontend patterns
• Lead development of new visualization systems for ML‑driven analysis and operator workflows

• Full‑time, salaried
• Mon–Fri hybrid (Wed remote); expectation is ≥80% in‑office (Phoenix HQ)