Senior Front End Software Engineer

Radiant; El Segundo (CA); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Equity program

Medical coverage 100% up to base plan

Dental 100% coverage

Vision 100% coverage

Flexible PTO policy

HQ in El Segundo

Job summary

Radiant seeks a Senior Software Engineer to own the frontend for our in-house telemetry and fleet management platform. You will join the Mission Software team and build on a highly technical telemetry streaming platform, enabling data analysis and configuration for Radiant's Kaleidos reactor project.

You’ll work on a modern React + TypeScript + Vite stack, develop performant data-review features, and collaborate with engineers and operators to drive critical UI capabilities across the product.

Qualifications

• Hands-on experience building frontend for telemetry or complex UI systems.
• Proficient in React + TypeScript for SPAs, testing with Jest/Playwright.
• Experience with real-time data streams, WebSockets, WebRTC or SSE.

Responsibilities

• Own critical parts of the frontend for an in-house telemetry and fleet management platform.
• Develop highly reliable, performant systems for data review and analysis.
• Build frontend pages for complex device configuration and telemetry systems.
• Collaborate with Mission Software team and stakeholders across the company.
• Contribute to a modern React + TypeScript + Vite codebase; work in a fast-paced, extended-hours environment.

Skills

Frontend development

React

TypeScript

WebSockets

WebRTC

SSE

Code review

Playwright

Jest

TanStack Query

React Router

Pixi.js

WebGPU

Yjs

CRDT

Education

Bachelor's degree in Computer Science or related field

Tools

React

TypeScript

Vite

Pixi.js

Yjs

Rust

Axum

Python

FastAPI

Job description

• Radiant is seeking a Senior Software Engineer to own the frontend for our in-house telemetry and fleet management platform
• You’ll join the Mission Software team, build on top of a highly technical telemetry streaming platform, and work on fleet monitoring systems for Radiant’s portable nuclear reactor, Kaleidos
• You’ll also build additional features for engineers and operators, adding new data analysis and configuration capabilities to a critical platform
• The code you write will help design, run, and mass-produce the first high-temperature gas-cooled portable microreactor ever to be commercialized
• Own critical parts of the frontend for our internal telemetry and fleet management platform, working in a modern React + TypeScript + Vite codebase
• Develop highly reliable, performant systems for data review and analysis
• Develop frontend pages for complex device configuration and telemetry systems
• Collaborate with other members of the Mission Software team and reach consensus among stakeholders across the company
• Our Tech Stack:
• Typescript
• React
• Vite
• Pixi.js & Yjs
• Rust + Axum Web / Python + FastAPI
• Must be willing to work extended hours and weekends as necessary to accomplish our mission

Benefits

• Equity: Substantial incentive stock plan for all salaried employees
• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans
• Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits
• Dental: 100% coverage, orthodontia extra, 50% for dependent
• Vision: 100% coverage + 50% for dependents
• Flexible PTO policy
• Beautiful El Segundo headquarters close to the Pacific Ocean
• Team-bonding company outings, happy hours and in-person camaraderie

The ideal candidate is outgoing and organized, ready to collaborate with other engineersStrong code review & debugging skillsExperience building highly performant, complex, mission-critical systems using technologies like WebSockets, WebRTC, or SSE5+ years of professional experience in web development, frontend development, and / or desktop GUI developmentBachelor’s degree in Computer Science, Engineering, Physics, or a related technical fieldHas worked on a complicated UI system before, driving forward critical featuresProficient in using React + TypeScript for SPAs, testing with Jest + PlaywrightExperience using the following technologies: TanStack Query + React Router, Pixi.js + WebGPU, Yjs or similar CRDTHands-on hardware tech experience, working closely with hardware engineers to develop deeply coupled applicationsHMI or dashboarding design experience