Senior HPC Software Engineer — Onsite, El Segundo

Radiant; El Segundo (CA); On-site; USD 158,000 - 219,500; Full time

Benefits offered by this job

Stock plan

Medical benefits

One Medical membership

Vision coverage

Dental coverage

Flexible PTO

Lunch provided

Job summary

Radiant in El Segundo, CA, seeks a Senior Software Engineer to build and maintain on-site HPC infrastructure and scientific computing tooling. You will enable researchers to focus on their science by delivering scalable, resilient environments and cross-disciplinary support in a fast-paced startup setting.

The role emphasizes ownership of systems, debugging legacy stacks, and collaboration with software and DevOps teams to advance automated workflows across AWS and on‑prem environments.

Qualifications

• Bachelor's degree in Computer Science, Engineering, Physics, or a related technical field.
• 4+ years of professional experience in developer productivity, site reliability, DevOps, infrastructure, or platform engineering.
• Linux and sysadmin fluency, file systems, process management, and networking.
• Strong proficiency in one or more languages: Python, Golang, Rust, C#, or C/C++.
• Solid code review skills, including the ability to read stack traces and work through legacy scientific software environments.
• Strong communication skills; organized and effective when fielding requests from engineering stakeholders.
• Ability to dig into complex, nested legacy stacks and communicate findings clearly to a broader technical audience.

Responsibilities

• Support workflows, tooling, and performance for scientific computing, including Ansys, STAR-CCM+, and Abaqus, covering licensing, environment setup, job orchestration, and results infrastructure.
• Serve as a resource for engineering teams, fielding HPC questions, software issues, and infrastructure needs from nuclear, thermal, materials, mechanical, and electrical engineers, and translating them into actionable work.
• Triage inbound infrastructure requests, HPC/MPI/Linux debugging, and job failure analysis, prioritizing effectively and communicating clearly across stakeholders.
• Help modernize legacy scientific computing systems and tooling, migrating to current stacks to improve maintainability, performance, and developer experience.
• Partner with DevOps engineers to maintain systems across AWS and on-premises Linux environments, supporting high availability, security, and performance for mission-critical workloads.
• Contribute to tools supporting build systems, testing frameworks, deployment automation, and developer environments.

Skills

Python

Golang

Rust

C/C++

Linux system administration

Communication

Education

Bachelor's degree in Computer Science or related field

Master's degree in Computer Science or related field

Tools

Kubernetes

Docker

AWS

Terraform

Ansible

Job description

Radiant in El Segundo, CA, seeks a Senior Software Engineer to build and maintain on-site HPC infrastructure and scientific computing tooling. You will enable researchers to focus on their science by delivering scalable, resilient environments and cross-disciplinary support in a fast-paced startup setting.

The role emphasizes ownership of systems, debugging legacy stacks, and collaboration with software and DevOps teams to advance automated workflows across AWS and on‑prem environments.