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Oklo

Senior Mechanical Design Engineer - Reactor Module

Oklo · Santa Clara, CA or Remote

Posted about 3 months ago · $125,000 - $165,000

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

Is this posting real?

This role has been open
81 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

As a Senior Mechanical Design Engineer at Oklo, you will be responsible for designing critical hardware for advanced fast reactors, including multi-component weldments and assemblies. Your role involves collaborating with cross-functional teams to ensure designs meet safety regulations and performance standards, using CAD tools for modeling, and conducting design reviews. You will also manage documentation and work closely with fabrication partners to refine designs for production.

Our read on this posting3.8out of 5
benefits
4/5
freshness
1/5
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 or higher degree in Mechanical Engineering or a related engineering discipline
  • 8+ years of industry experience in mechanical or structural design within sectors such as aerospace, automotive, energy, or industrial equipment
  • Proficiency in 3D CAD modeling software (e.g., Siemens NX, CATIA, SolidWorks)
  • Experience with design control using PDM/PLM tools (e.g., Siemens Teamcenter, SolidWorks PDM, Windchill)
  • Robust understanding of mechanical design principles, including DFM (Design for Manufacturability), DFA (Design for Assembly), and tolerance stack-up analysis
  • Ability to interpret and produce engineering drawings that apply GD&T in line with ASME Y14.5 or similar standards

Nice to have

  • Experience designing large structural weldments and mechanical joints
  • Familiarity with the ASME Boiler and Pressure Vessel Code, particularly Sections III or VIII
  • Background in designing components for high-integrity or safety-critical systems (e.g., nuclear, aerospace, defense, or heavy industry)
  • Proven ability to lead hardware projects through the full development cycle—from concept and design to testing and production
  • Comfortable working with external manufacturers and engineering consultants for fabrication and analysis support

What you get

  • Salary: $125,000 - $165,000 (pursuant to level and experience)
  • 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 requires a high level of collaboration and adaptability in a fast-paced startup environment
  • Candidates should be aware of potential recruitment fraud and verify communications from official Oklo email addresses

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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