Software Engineer, Frontend

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. Portable nuclear power with rapid deploy capability can replace similar-sized diesel generators, and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.

Software Engineer - Frontend

Radiant is seeking a driven Frontend Engineer to build and maintain our website, data platform interface, and web-based visualization tools for internal engineers. In this role, you will collaborate across the entire org and work closely with the software, business operations, and marketing teams to create intuitive, performant, and scalable web applications. The interfaces you build, dashboards you design, and visualization tools you develop will be used by engineers and operators to design, monitor, and analyze the first new reactor design in 50 years. You will have the opportunity to establish the frontend architecture and user experience foundation for production.

Responsibilities and Duties :

• Design, develop, and maintain Radiant's public-facing website and internal web applications using React and TypeScript, ensuring responsive, accessible, and high-performance user experiences across devices with modern build tooling (Vite).
• Collaborate with the marketing team to translate brand vision and content strategy into engaging web experiences
• Build, iterate, and maintain our data platform used by operators to monitor and control reactor systems, prioritizing reliability, real-time data visualization, and intuitive workflows for critical operations using React-based dashboards and component libraries
• Create interactive data visualization and analysis tools in TypeScript that enable engineers to explore reactor performance data, simulation results, and test outcomes to inform design decisions and validate system behavior
• Collaborate with software, hardware, operations, and marketing teams to define frontend architecture, establish UI / UX patterns and reusable component libraries, and integrate web applications with backend APIs, databases, and real-time data streams

Required Qualifications and Skills :

Bachelor's degree in Computer Science, Math, Physics, Engineering, or a related technical field.

1+ Years of professional experience in front-end, full-stack, web development engineering.

Proficiency in React and Typescript for front-end development.

Strong experience building modern web applications with React, Typescript, and Vite as a stack.

Familiar with Nginx and Docker.

Ability to prioritize, self-direct, and manage multiple projects, with strong communication skills, interacting with multiple stakeholders.

Customer-focused mindset with an emphasis on creating intuitive and easy-to-use products.

Desired Qualifications and Skills :

Experience with React Compiler 19+

Proficiency in programming languages such as Python, Rust, or C#

Experience with technical visualization tools (WebGL, D3.js, Apache ECharts) and time-series data.

Familiarity with Kubernetes and highly available applications.

Familiarity with Cloudflare CDN, AWS EKS, and AWS EC2.

Portfolios or personal websites showcasing your prior work are a plus.

Our Tech Stack :

Typescript

React

Vite

Nginx

Rust + Axum Web / Python + FastAPI

Additional Requirements

Must be willing to work extended hours and weekends as necessary to accomplish our mission.

Must work 100% onsite at El Segundo HQ.

Total Compensation and Benefits

Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications.

Benefits and Perks for Eligible Employees :

Stock : Substantial incentive stock plan for all full-time employees.

Medical : 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.

One Medical : Sponsored memberships for eligible employees and their dependents.

Vision : 100% premium coverage for top tier plan + 50% for dependents.

Dental : 100% premium coverage for top tier plan (including orthodontia) + 50% for dependents.

Voluntary life, accident, hospital, critical illness, commuter and FSA / HSA are offered as employee contributed benefits.

8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.

Daily catered lunch. Free snacks and drinks.

Flexible PTO policy. Remote workday allocation.

Company and team-bonding events, happy hours and in-person camaraderie.

Beautiful El Segundo headquarters close to the Pacific Ocean.

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

Unfortunately, we are unable to provide visa sponsorship at this time.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.