# Radiation Effects Engineer - Modeling

**Company**: Astranis
**Location**: San Francisco
**Work arrangement**: onsite
**Experience**: senior
**Job type**: full-time
**Salary**: $120,000-$145,000
**Category**: Engineering
**Industry**: Technology
**Wikidata**: https://www.wikidata.org/wiki/Q96372482

**Apply**: https://job-boards.greenhouse.io/astranis/jobs/4719442006?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply
**Canonical**: https://yubhub.co/jobs/job_bbb68f98-728

## Description

Astranis builds advanced satellites for high orbits, expanding humanity's reach into the solar system.

As a Radiation Effects Engineer focused on modeling and theory, you will own the analytical definition of our spacecraft's radiation and charging environments, transforming physical theory into actionable design constraints.

## Responsibilities

- Own the analytical model of the geostationary (GEO) radiation environment, modeling trapped particle populations (AP8/AP9, AE8/AE9), solar proton fluences (Sapphire), and galactic cosmic rays (CREME96)

- Perform high-fidelity 3D Monte Carlo and sector-analysis radiation transport simulations using FASTRAD against complex spacecraft CAD assemblies to generate local, component-level dose-depth curves

- Lead analytical studies on spacecraft charging, including surface charging (using NASCAP-2k or SPIS-SC) and internal charging (using FASTRAD internal charging calculations or SPIS-IC) to prevent electrostatic discharge (ESD) risks

- Develop, scale, and maintain Python-based pipelines to process, analyze, and visualize transport simulation datasets, automating the generation of spacecraft-wide dose budgets

- Translate complex simulation data into actionable engineering guidance for shielding allocation, material selection, and electrical grounding architectures

## Requirements

- Bachelor of Science degree in Nuclear Engineering, Physics, Electrical Engineering, or equivalent

- 2+ years of industry experience using radiation environment tools such as OMERE or SPENVIS and transport tools such as FASTRAD, Geant4, or MCNP

- Solid theoretical foundation in radiation interaction with matter, including ionization, non-ionizing energy loss, charge deposition, and secondary bremsstrahlung generation

- Experience modeling spacecraft charging physics and electric field buildup in dielectrics

- Proficiency in Python for mathematical post-processing, data scraping, and modeling automation

- High-degree of ownership and technical depth; ability to evaluate complex system trade-offs with sparse initial data

## Benefits

- Base pay: $120,000-$145,000 USD

- Significant equity package via incentive stock options

- High-quality company-subsidized healthcare, disability and life insurance

- 401(k) retirement planning

- Flexible PTO

- Free on-site catered meals

## Skills

### Required
- radiation environment modeling
- spacecraft charging physics
- Python programming
- radiation transport simulations
- FASTRAD
- NASCAP-2k
- SPIS-SC

### Nice to have
- Master of Science or PhD in Nuclear Engineering
- deep dielectric charging failure mechanisms
- ISO 11221 spacecraft charging standard
- MIL-STD-883 Test Method 1019

---

Source: [Apply at job-boards.greenhouse.io](https://job-boards.greenhouse.io/astranis/jobs/4719442006?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)