Senior Nuclear Criticality Safety Engineer
Oklo · Santa Clara, CA or Remote
Posted 2 days ago · $135,000-$175,000
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 Senior Nuclear Criticality Safety Engineer at Oklo is tasked with performing criticality safety evaluations and developing the nuclear criticality safety program for a used nuclear fuel recycling facility. Responsibilities include identifying NCS hazards, conducting evaluations to ensure subcriticality, documenting analyses, and supporting safety basis development. The role requires collaboration within a dynamic team environment focused on innovative solutions in nuclear safety.
- benefits
- 4/5
- 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
- Bachelors, Masters, or PhD in nuclear engineering, chemical engineering, or chemistry, or related field
- Minimum 5+ years experience performing criticality safety evaluations as part of a nuclear facility’s safety basis
- Knowledge of nuclear science, physics of criticality, and chemistry
- Knowledge of nuclear fuel cycle processes and nuclear fuel cycle facility accident scenarios
- Proficient with Attila4MC, MCNP, SCALE, and/or Serpent codes and modules
- Familiarity with critical experiments and their purpose
Nice to have
- Knowledge of used nuclear fuel recycling technologies
- 10+ years of experience performing criticality safety evaluations for an NRC licensed fuel cycle facility
- Familiarity with NUREG-1513, NUREG-1520, NUREG/CR-6410, NUREG/CR-6698, NUREG/CR-7311, and NRC RG 3.71
What you get
- Salary: $135,000-$175,000
- Flexible time off
- Equity
- Competitive pay
- 401k
- Health insurance
Worth weighing
- Remote employees must travel to headquarters twice a quarter and be onsite for the first two weeks of onboarding.
- The role is in a fast-paced startup environment, which may not suit everyone.
- Candidates must meet the definition of a U.S. person under export control laws.
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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