Full Stack Software Engineer

About Radiant

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, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. 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 leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory next year, with initial customer deliveries beginning in 2028.

Software Engineer - Full Stack

Radiant is seeking a driven Full Stack Software Engineer to build and maintain our data historian and fleet management tool. In this role, you will be writing performant backend Rust code, collaborating with frontend engineers to develop new features, and working with engineers to create intuitive solutions. The backend systems you’ll 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 backend architecture and user experience foundation for production.

Responsibilities And Duties

- Design, develop, and maintain Radiant’s internal data historian using Rust & Axum Web, ensuring data durability and reliability. Work with time-series databases to ensure fast insert and query performance, prioritizing uptime and reliability.

- Collaborate with fellow software engineers to build out CLI tooling to enable fast workflows when handling high amounts of time-series data.

- Maintain and expand upon testing infrastructure, building out unit/regression/integration tests to ensure releases are performant and bug-free.

- Maintain and own critical infrastructure, working closely with our DevOps team to build out monitoring and health checks.

Required Qualifications And Skills

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

- 2+ Years of professional experience in front-end, full-stack, or systems engineering.

- Strong proficiency in Rust.

- Experience building highly available applications using Kubernetes.

- Familiarity with time-series databases such as InfluxDB, Clickhouse, or TimescaleDB.

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

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

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

Desired Qualifications And Skills

- Experience using Axum Web

- Experience using Web sockets

- Experience building secure systems under FIPS-140.

- Proficiency in programming languages such as Typescript, C#, and Python.

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

Tech Stack

Typescript

React

Vite

Nginx

Rust + Axum Web.

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.

Benefits And Perks

- Stock: Substantial incentive stock plan for all full-time employees. - Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.

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

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

- Dental: 100% top tier plan coverage, orthodontia extra, 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.

Total Compensation And Benefits

Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.

The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com.

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.

Compensation Range: $74K - $153.3K