Shielding Analysis Engineer

Oklo; Santa Clara (CA); On-site; USD 102,000 - 225,000; Full time

Benefits offered by this job

Health insurance

Bonuses

Equity

401(k)

Flexible work hours

Wellness credits

Job summary

Oklo is seeking a Shielding Analysis Engineer to join our engineering team. You will define, develop, and execute radiation shielding and radiation transport analyses to support reactor design, plant layout, performance evaluation, and safety assurance.

This role requires strong Python, HPC experience, and familiarity with Monte Carlo/transport tools (MCNP, SCALE, OpenMC, Serpent). You will collaborate with the design team and contribute to verification, licensing, and technical reporting in a

Qualifications

• Fluency with Python.
• Proficiency with high performance computing systems.
• Experience with fast reactor design, shielding design, or radiation protection analysis is highly recommended.
• Proficiency with radiation transport tools such as MCNP, SCALE, OpenMC, and Serpent is highly recommended.
• Proficiency with variance reduction techniques (weight windows, surface read/write, source biasing, CADIS/FW-CADIS) is recommended.
• Experience with source-term generation, activation, dose-rate calculations, and shielding design methods is recommended.
• Proficiency with CAD software such as SolidWorks is a plus.

Responsibilities

• Define, develop, and execute shielding/transport analyses for reactor design, layout, and safety.
• Perform Monte Carlo and deterministic shielding calculations using MCNP, SCALE, OpenMC, Serpent.
• Analyze source term, activation, streaming, skyshine, and dose-rate effects with appropriate methods.
• Support verification/validation and licensing interactions with technically sound shielding analyses.
• Collaborate with design teams and document work with clear technical reports.

Skills

Python

High performance computing

Communication

Writing skills

Education

Bachelors/Masters/PhD in nuclear engineering or a technical field

Tools

MCNP

SCALE

OpenMC

Serpent

Job description

Thanks for your interest in Oklo! We are searching for a Shielding Analysis Engineer to join our engineering team.

Position Description

The Shielding Analysis Engineer is responsible for defining, developing, and executing radiation shielding and radiation transport analyses to support reactor design, plant layout, performance evaluation, and safety assurance.

This role involves working closely with the broader design team to solicit and capture requirements, establish the scope of shielding evaluations, and implement appropriate source term, activation, dose rate, streaming, and shielding models and methods.

Areas of analysis include, but are not limited to, radiation transport, material activation, source term development, dose assessment, and shielding design optimization.

The engineer will also support verification and validation activities and contribute to licensing and regulatory interactions by providing technically sound and defensible shielding analyses.

Specific responsibilities may include:

• Perform the complete range of actions involved in supporting shielding design, radiation transport analysis, and dose assessment for using Monte Carlo and supporting codes on Oklo facilities.
• Perform calculations and analyses in Monte Carlo based radiation transport codes such as MCNP, SCALE, OpenMC, and Serpent.
• Perform source term, activation, streaming, skyshine, and dose‑rate analyses using appropriate Monte Carlo and deterministic methods.
• Support the qualification and verification of shielding analyses, including validation against experiments, benchmarks, and operationally relevant radiation measurements.
• Be aware of and familiar with radiation shielding, radiation transport, and fast reactor core design and analysis work being performed internationally, as well as related benchmark calculations and experiments being performed internationally.
• Provide technical feedback to quick‑iterating design teams.
• Document work using modern tools and techniques, and write well‑written, thoughtful technical reports.

Minimum Qualifications:

• Bachelor's, Master’s, or PhD in a technical field, such as nuclear engineering, with experience in reactor design, radiation transport, shielding analysis, or radiation protection (Master’s or PhD may be preferable).
• Fluency with Python.
• Proficiency with high performance computing systems.
• Experience with fast reactor design, shielding design, or radiation protection analysis is highly recommended.
• Proficiency with radiation transport tools such as MCNP, SCALE, OpenMC, and Serpent is highly recommended.
• Proficiency with variance reduction techniques such as weight windows, surface read/write, source biasing, and CADIS/FW‑CADIS methods is recommended.
• Experience with source‑term generation, activation, dose‑rate calculations, and shielding design methods is recommended.
• Proficiency with CAD software such as SolidWorks is a plus.

Competencies

• Passionate about clean energy.
• Passionate about making advanced fission a reality.
• Willing and able to learn quickly.
• Knowledgeable about fast reactor design and radiation shielding considerations.
• Highly skilled with Monte Carlo radiation transport tools such as SERPENT, MCNP, SCALE, OpenMC, and Serpent.
• Skilled with shielding, source‑term, activation, and dose assessment methods, or willing and eager to learn.
• Skilled with variance reduction techniques and tools, such as weight windows, surface source read/write, source biasing, and CADIS/FW‑CADIS methods.
• Eager to work on a dynamic team, receive constructive feedback, and grow with us.
• 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 modern active voice, so make your cover letter compelling and write it well!
• Able to communicate technical content and results verbally.

Who you are

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.

About Oklo travel requirements

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.

About Oklo compensation

Salary: $102,000-$225,000

Oklo offers flexible time off, equity, bonuses, competitive pay, 401(k), health insurance (with employer contribution), HSA, FSA, flexible work hours, wellness credits, and other benefits.

This position may involve access to information subject to U.S. export control laws. Only applicants who meet the definition of a U.S. person under applicable laws may be eligible.

About Oklo Inc.

Oklo Inc. is developing fast fission power plants to deliver clean, reliable, and affordable energy at scale; establishing a domestic supply chain for critical radioisotopes; and advancing nuclear fuel recycling to convert nuclear waste into clean energy. Oklo was the first to receive a site use permit from the U.S. Department of Energy for a commercial advanced fission plant, was awarded fuel material from Idaho National Laboratory, and submitted the first custom combined license application for an advanced reactor to the U.S. Nuclear Regulatory Commission. Oklo is also developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and U.S. National Laboratories.

#CHOP: Oklo’s Values

• Collaboration: We go further, together. We bring diverse perspectives, listen actively, and build trust through transparency and respect. We work across disciplines, sharing ownership to turn complex challenges into shared successes.
• Humility: We are team players who act for the good of the company and for the world. We are focused on our mission, not personal recognition.
• Ownership: We take pride in what we do and how we do it. We are proactive in finding solutions and see tasks through to completion. We are committed to delivering on our promises to provide clean, reliable, and affordable energy.
• Pathfinding: We chart new ground where no path exists by approaching challenges with curiosity, courage, and creativity while navigating ambiguity.

Recruitment Fraud Disclaimer

Oklo is aware of recent recruitment fraud attempts targeting job seekers. Please be cautious of anyone claiming to represent Oklo who does not contact you from an official Oklo email address.

All legitimate communications from our recruiting team— including application updates, interview requests, and job offers — will come exclusively from an @oklo.com email. Oklo will never ask for sensitive personal information, payments, or account credentials during the hiring process.

If you receive suspicious outreach or have concerns about the authenticity of any communication claiming to be from Oklo, please contact us through the official channels listed on our website.