Valar Atomics is scaling nuclear energy for heavy industrial power and clean hydrocarbon fuel production. Backed by Sequoia.
About the role
Applicants must be legally authorized to work in the United States as a U.S. citizen or lawful permanent resident (green card holder).
What they're looking for
- Participate in design and architecture discussions early, before implementation begins
- Perform lightweight threat modeling on new features and services — identifying trust boundaries, data flows, and likely attack surfaces
- Flag risky design patterns (auth schemes, data handling, third-party integrations, database access patterns) and recommend secure alternatives
- Provide security requirements and acceptance criteria that get built into planning/ticketing, not bolted on afterward
- C#, Python, React: Perform manual and tool-assisted secure code review across all three
- Postgres: Review queries and schema design for injection risks, access control issues, data exposure, and unsafe query patterns
More about this role
At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable—unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will demonstrate how advanced nuclear systems and fuel fabrication can power the future. Joining Valar Atomics means becoming part of a company where autonomy, ownership, and impact exist at every level.
The Team
As part of the Business organization, IT & Enterprise Software delivers the technology infrastructure, enterprise applications, and digital tools that power Valar's operations. The team ensures secure, reliable, and scalable technology solutions that support every function across the company.
The Role
We're looking for a Software Security Engineer to embed security into our software development lifecycle — from initial design through shipped code. This role is split across two key moments: early-stage design and planning reviews, where you'll help engineering teams make...
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