Senior Software Engineer - Data Platform

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.

Senior Software Engineer - Data Platform

Radiant is seeking a driven Senior Software Engineer to architect and build data pipelines for analysis and simulation. In this role, you will enable software engineers and system REs across the organization to quickly and easily interrogate simulation results and analyze hardware design iterations. Your work will be a critical link between internal and third-party analysis tools and the teams making hardware and software design decisions.

Responsibilities and Duties:

• Architect data platforms and pipelines for design analysis using modern data engineering tools for scalable data processing.
• Design and maintain batch and streaming ETL pipelines using Spark, Kafka, Flink, Airflow, or similar frameworks.
• Implement data modeling and optimization strategies for analytical workloads across data lakes, warehouses, and real-time databases.
• Own data products end-to-end from requirements gathering through delivery and monitoring.
• Build data quality frameworks and monitoring systems to ensure reliability and observability.
• Develop pipelines for data transformation, aggregation, and feature engineering to support simulation and hardware design.
• Collaborate with simulation and mechanical engineering teams to understand workflows and data needs.
• Design APIs and data access layers for self-service analytics and programmatic access.

Required Qualifications and Skills:

• Bachelor's degree in computer science or engineering.
• Expert proficiency in Python, Rust, R, C#, or C/C .
• 5 years of software engineering experience in data platform engineering, pipeline development, or distributed data systems.
• Experience building data pipelines for hardware analysis, AI/ML workflows, or distributed processing.
• Experience with modern data platforms (Databricks, Snowflake, BigQuery, Redshift).
• Deep expertise with orchestration systems (Kubernetes, Argo Workflows, Airflow).
• Experience with streaming technologies (Kafka, Kinesis, Pulsar).
• Familiarity with Git, Docker, and CI/CD frameworks.

Desired Qualifications and Skills:

• 7 years of software engineering experience in data platform engineering or distributed systems.
• Experience with hardware simulation or computational modeling.
• Experience in testing software and hardware systems.
• Experience with distributed software development and design patterns.
• Experience with data lake architectures, columnar formats (Parquet, ORC, Arrow), and table formats (Delta Lake, Iceberg, Hudi).
• Familiarity with data visualization tools (Grafana, Plotly, Observable, Streamlit).
• Experience with data governance and metadata management tools (DataHub, Amundsen).
• Knowledge of distributed SQL systems (Presto, Trino, Spark).

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.