Radiant · 2 weeks ago
Staff/Principal Software Engineer - Tools and Infrastructure
El Segundo, CA
Full-time
Onsite
Senior Level, Lead/Staff
6+ years expRadiant is an El Segundo-based startup building portable nuclear microreactors. The Lead Software Engineer will develop the software infrastructure and tooling that supports the engineering organization in simulation and high-performance computing, enabling faster reactor design iterations and data-driven analysis.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
Hands-on development of internal platforms that provide real-time monitoring, Digital Twin visualizations, simulation post-processing, and analysis tools for Kaleidos reactor systems
Develop our HPC infrastructure, environment and tooling necessary to maintain high-quality standards and detect issues in real time across engineering systems
Design and implement integration platforms that enable seamless data flow across Radiant's engineering ecosystem, using connectors and APIs to bridge CAD systems, Multiphysics simulation tools, data acquisition systems, and engineering databases
Collaborate on technical initiatives across software, simulation, electrical, mechanical, and nuclear teams
Work across teams to integrate software with hardware platforms, control systems, and external software tools
Design and build internal developer tooling, scientific tooling, including CI/CD pipelines, version control systems, artifact management, build systems, developer environments, testing frameworks, and release processes
Qualification
Required
Bachelor's degree in computer science, physics, mechanical engineering, or a related engineering field
6+ years of professional software engineering experience with deep expertise in developer productivity, software tooling, infrastructure, high-performance computing (HPC), or platform engineering
Expert-level proficiency in programming languages such as Python, Golang, Rust, C#, or C/C++
Deep understanding of system design, data structures, algorithms, and distributed systems architecture with a track record of designing systems from the ground up
Strong foundation in software engineering best practices, including version control, code review, testing, and CI/CD methodologies
Extensive hands-on experience in distributed software development, building systems, and infrastructure automation
Experience integrating software solutions into hardware systems such as robotics, controls, circuits, devices, etc
Significant experience architecting and implementing systems in hybrid cloud/on-premises environments, specifically AWS and Linux
Familiarity with Git version control, Docker containerization, and common CI/CD frameworks for automated build and deployment pipelines
Preferred
Advanced degree (Master's and or PhD) in computer science, physics, mechanical, electrical engineering, or a similar field
8+ years of professional software engineering experience with deep expertise in developer productivity, software tooling, infrastructure, high-performance computing (HPC), or platform engineering
Experience in highly regulated industries (aerospace, defense, automotive, nuclear, or medical devices)
Technical understanding of simulation workflows, computational modeling, or scientific computing infrastructure
Hands-on experience with big data processing systems (Spark, Hadoop, Airflow, Trino, Kubernetes-based platforms)
Proven track record in architecting distributed systems, databases, large-scale data systems, and high-performance backend APIs
Experience with observability and monitoring systems using Datadog, Grafana, Prometheus, InfluxDB, or similar tools
Familiarity with TypeScript, React, Angular, Vite, Node.js, and other modern web frameworks
Track record in building developer platforms or infrastructure-as-a-service systems
Previous experience working in an embedded SWE role is a plus
Benefits
Substantial incentive stock plan for all full-time employees.
100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
Sponsored memberships for eligible employees and their dependents.
100% premium coverage for top tier plan + 50% for dependents.
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.
Company
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity and heat in a compact, factory-built form.
51-200 employees
Funding
Current Stage
Late StageTotal Funding
$518.82MKey Investors
Boost VC,Draper AssociatesAlumni Ventures,DCVCAndreessen Horowitz
2025-12-17Series D· $300M
2024-11-14Series C· $165M
2023-04-18Series B· $40M
Leadership Team
Doug Bernauer
Chief Executive Officer
Recent News
alleywatch.com
2026-01-23
2026-01-07
The Motley Fool
2026-01-04
Company data provided by crunchbase