Senior Software Engineer

Position Description

Oklo is a fast-moving startup where you will be responsible for tackling a wide range of challenges in reactor design and analysis. A nuclear background is not required, but a healthy curiosity and eagerness to learn are essential in this role.

Specific responsibilities may include:

• Lead the design of systems for storing and retrieving reactor data and physics results at scale
• Architect and own CI/CD pipelines for multiphysics analyses, ensuring reliability, observability, and reproducibility of complex simulations
• Develop tools and platforms that enable reactor engineers to visualize, compare, and evaluate reactor designs
• Develop physics kernels to solve unanswered problems, or to improve performance of existing models
• Develop reactor optimization schemes and statistical experiments to inform design changes
• Mentor other engineers, set technical direction, and contribute to building a strong engineering culture

Minimum Qualifications:

• Bachelor’s degree in computer science, computer engineering, or equivalent work experience
• 8+ years of professional software engineering experience
• Fluency in Python
• Strong proficiency with Git
• Experience designing, implementing, and maintaining CI/CD pipelines
• Demonstrated ability to own projects end-to-end: requirements gathering, architecture, implementation, testing, deployment, and iteration
• Strong communication skills and experience collaborating with cross-functional partners (e.g., scientists, analysts, or domain experts)
• Curiosity and passion for nuclear power, closing the nuclear fuel cycle, and sustainable energy generation

Bonus Qualifications:

• Proficiency in Rust
• Proficiency in Typescript/Javascript (especially Svelte)
• Experience growing and mentoring small software teams or organizations
• Experience designing and operating large data collection or analysis pipelines
• Experience with optimization, statistics, and design of experiments
• Knowledge of GitLab CI/CD
• Prior work developing and implementing software quality assurance programs and testing strategies, especially in quality- or safety-focused industries
• Experience working in regulated environments (e.g., energy, aerospace, medical, automotive)

Who you are:

A startup person: You aren't driven by titles or hierarchy, and prefer efficiency to excess process. You don't need or expect to have a lot of guidance but you enjoy working in a fast-paced team. If you prefer the culture and feel of a large organization, that is great, but you likely won’t enjoy working with us! There is plenty of important work and plenty of good opportunities with organizations like that.

Motivated: You are self-motivated. You bring an enthusiasm to the team, and imbue a sense of passion that goes beyond clocking in and clocking out. This isn’t about a fake or arbitrary “pieces of flair” mentality or lack of work-life balance! It is about being a part of the vision and feeling a part of reaching team goals.

A team-player: Oklo genuinely is a team. We aren’t about taking credit for ourselves, and we aren’t about pushing blame to others. We do incr