Senior/Staff 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.

What You'll Do

• 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

Examples of problems you might own in your first 90 days

• 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

What Makes You a Great Fit

Technical Excellence

• 7+ years building production web applications with deep expertise in React and modern JavaScript/TypeScript
• 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

Nice To Have (not Required)

• 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

Impact You'll Have (near-term roadmap)

• 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

Work Model & Schedule

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

How We Hire (fast, respectful, practical)

1. 20-min intro with the founder/hiring manager to trade context and assess mutual fit
2. Practical work sample (60–90 min; a real task in our stack)
3. Team meet + peer programming (system design + collaboration)
   We aim to move from first chat to decision quickly.