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Oklo

Thermal-Hydraulics and Safety Analysis Engineer - Isotopes

Oklo · Santa Clara, CA or Remote

Posted 2 days ago · $150,000 to $200,000

or apply directly on Oklo's site. We never take the application ourselves.

Is this posting real?

This role has been open
2 days
Oklo's roles stay open a median of 64 days
Reposted
No
Salary listed
Yes
99% of Oklo's roles list one
Ghost-job risk at Oklo
high
74 stale, 5 reposted of 105 open
Hiring momentum
131 roles opened in the last 90 days
↑ up vs. the prior 90 days
Last confirmed on the employer's board
2026-10-24

Measured from postings appearing on and disappearing from Oklo's own greenhouse board since 2026-08-03. Full hiring picture for Oklo.

About this role

The Thermal-Hydraulics and Safety Analysis Engineer will develop and execute thermal-hydraulic analyses to support the safety case and licensing of Oklo's reactor systems. This role involves hands-on transient modeling, safety-methodology development, and collaboration with various engineering teams to ensure compliance with regulatory requirements. The engineer will also prepare technical documentation and evaluate design changes for their impact on safety and performance.

Our read on this posting4.8out of 5
benefits
5/5
freshness
5/5
career value
4/5
role clarity
5/5
pay transparency
5/5

Scored from the posting itself — how clearly the role is described, how much it says about pay and benefits, and how recently it was listed. Not a judgement of Oklo as an employer.

What you need

  • Bachelor's, master's, or doctoral degree in nuclear, mechanical, chemical, or aerospace engineering, or a closely related technical field.
  • Five or more years of relevant experience in reactor thermal-hydraulics, nuclear safety analysis, reactor transient analysis, or a closely related field.
  • Demonstrated experience developing and executing systems-level transient models using RELAP5.
  • Strong foundation in heat transfer, fluid mechanics, thermodynamics, and reactor thermal-hydraulics.
  • Experience defining and analyzing reactor transients or accident scenarios, including initial conditions, boundary conditions, equipment response, operator or control actions, and acceptance criteria.
  • Experience evaluating the reasonableness and applicability of models, correlations, assumptions, and results rather than treating analysis software as a black box.

Nice to have

  • Experience supporting NRC or DOE licensing applications, audits, topical or methodology reports, requests for additional information, or other regulatory interactions.
  • Fluency with Python or another language used for model automation, data analysis, visualization, and quality checks.
  • Competency with modern software engineering practices, including version control, automated testing, reproducible computing environments, and continuous integration.
  • Experience working under a nuclear quality-assurance program or with safety-related analysis software and records.
  • Experience mentoring other analysts or providing technical review of safety-analysis work.

What you get

  • Salary range of $150,000 to $200,000, subject to experience level.
  • Flexible time off.
  • Equity and bonuses.
  • Competitive pay.
  • 401(k) with employer contribution.
  • Health insurance with employer contribution.

Worth weighing

  • The role requires a high degree of independence and iterative work, which may not suit everyone.
  • The position does not involve source-term or severe-accident progression analysis, limiting its scope in some areas of nuclear safety analysis.
  • Candidates must be comfortable with a startup environment, which may involve less structure and guidance than larger organizations.

Summarised from Oklo's posting. Read the full original.

Listed by Oklo on their greenhouse job board, last confirmed open on 2026-10-24. PitchMeAI is not the employer.

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