Principal Software Engineer

building or operating simulation, modeling, or scientific computing platforms—orchestration of computational codes, batch and distributed compute, and reproducible results management.

building enterprise and engineering software: full-stack services, web interfaces, and integration with commercial systems of record.

Demonstrated skill in both typed (like Java, C#, Go, C++, or Rust) and untyped (like Python or JavaScript) languages.

Proven track record driving architecture and technical decisions across multiple teams and stakeholders.

Working experience with cloud and containerized deployment, infrastructure as code, and CI/CD.

Deep understanding of computer science fundamentals, including algorithms, data structures, distributed systems, and data modeling.

Hands-on experience shipping production work with AI coding agents and assistants (Claude Code, Cursor, Copilot, or similar), and the judgment to verify what they produce before it lands.

Strong communication skills: open to the opinions of others, willing to bring your own creative ideas for solutions, and ready to own and rectify mistakes.

Bachelor's degree in computer science, engineering, mathematics, or a scientific discipline, or equivalent professional experience.

Preferred Skills and Experience Experience at a hardware, manufacturing, aerospace, energy, or heavy-industrial company where software served a physical system and downtime had physical consequences.

Familiarity with industrial data sources and protocols—historians, OPC UA, MQTT, Modbus—and the security boundaries between operational and enterprise networks.

with HPC scheduling, GPU compute, or large-scale batch orchestration.

Familiarity with regulated or quality-controlled environments and the software implications of NQA-1, GAMP 5, or 21 CFR Part 11.

integrating PLM, ERP, MES, LIMS, or document control systems, and a healthy skepticism about vendor claims.

with Git, Docker, Kubernetes, and deployment to both cloud and on-premises infrastructure.

building with LLMs and agents rather than just coding with them—retrieval over technical documents, agentic workflows, evaluation harnesses, or tool integrations.

growing a software team or function from its early stages, including hiring and mentorship. A point of view on where AI-assisted development helps, where it doesn't, and how to verify agent output in an environment where records end up in front of regulators. Tell us about it. What We Offer Competitive base salary Equity ownership in a rapidly growing advanced energy company Comprehensive medical benefits Unlimited PTO Free daily lunch and dinner provided onsite Generous PPE stipend High-impact startup environment with significant ownership and autonomy Opportunities for rapid career growth and internal advancement Direct collaboration with experienced operators, engineers, and industry leaders The opportunity to help build and scale transformative energy technology from the ground up Equal Employment Opportunity Statement Valar Atomics is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, gender identity, sexual orientation, national origin, age, disability, veteran status, or any other protected status under applicable law. We are committed to providing a workplace free of discrimination and harassment and will provide reasonable accommodation as required by law. Applicants must be legally authorized to work in the United States as a U.S. citizen or lawful permanent resident (green card holder). Salary $195,000 — $270,000 USD