Core Design Engineer
OkloSanta Clara, Canada
Full Time
Posted September 14, 2026
$130k - $190k
Nuclear Energy
Remote
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Listing evidence and provenance
- Source
- greenhouse View original listing
- Freshness
- Open in the current public read path; this is not an employer guarantee.Last observed September 29, 2026
- Classification
- Modern power-system classification not yet published for this listing.Legacy source industry field: Nuclear Energy
- Pay provenance
- Employer-provided pay
Job Description
Core Design Engineers at Oklo are responsible for designing performant and manufacturable reactor cores which balance neutronic, thermal hydraulic, material, mechanical, and economic considerations.
Key Responsibilities
- Traveling to headquarters (Santa Clara, CA) 2x per calendar quarter for team meetings, company offsite, or other business gatherings
- Translating top-level stakeholder requirements into well-written system functional requirements
- Modeling core performance over time through multiphysics simulations and first principles approaches
- Documenting work using modern tools and techniques, and producing well-written technical reports
- Collaborating cross-functionally to define performance requirements, and providing technical feedback to methods development teams
Requirements
- Bachelors, Masters, or PhD in nuclear engineering or a related field
- Experience with core design from a multidisciplinary perspective
- Experience with object-oriented programming language (e.g., Python, C++)
- Experience with neutronic analyses
- Experience with thermal hydraulic analysis
- Experience with material analysis
- Familiarity with principles of fast reactor core design
- Experience with fuel cycle optimization
- Familiarity/experience with ternary fuel and ternary fuel cycles
- Experience with CI/CD computing environments
- Experience with Monte Carlo neutronics tools (e.g., SERPENT, MCNP, SCALE, etc.)
- Experience with deterministic neutronics tools (e.g., DIF3D, PERSENT, etc.)
- Experience with reactor systems codes (e.g., SAS4A/SASSYS-1, SAM, RELAP, TRACE, GOTHIC, etc.)
- Experience with fuel analysis and fuel performance software (e.g., BISON, LIFE-METAL, etc.)
- Fluency in Python
- We are looking for a Core Design Engineer that is:
- Passionate about clean energy
- An optimist at heart
- Passionate about making advanced fission a reality
- Willing and able to learn quickly
- Willing to think differently and do things in new ways
- Comfortable in a fast-paced, highly iterative startup environment
- Excited to think creatively, critically, and reflectively about the problems they are solving while not leaning only on what has been done before
- Willing to propose novel and creative solutions to technical problems
- An excellent writer who can write in a modern active voice, so make your cover letter compelling and write it well!
- Able to communicate technical content and results verbally
- 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 incredible things because we work as a team.
- An excellent communicator : We need a person who is not only technically competent but also a clear and upbeat communicator.
- Creative : Being creative means that when things fall outside clear scopes or processes or problems arise without clear solutions, you are able to identify it as well as invent ways to solve a problem or fill a need without micromanagement. The successful person in this job will not only be creative, but also enjoy being creative and solving open-ended problems which may change day-by-day.
- Detail-oriented : This focus is a big part of excellence, consistency, and quality. Excellent grammar and spelling matter for both good communication as well as the image of the company that we put forward.
- Oklo requires remote employees to travel to headquarters (Santa Clara, CA) twice a quarter annually, based on business or team needs, including attendance at team meetings, off-sites, and other company events or gatherings. For the first two weeks of onboarding, employees are required to be in person at headquarters in Santa Clara, CA.
Ready to Apply?
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