Reactor Operations Engineer

Join Our Team as a Reactor Operations EngineerRadiant Industries is on the lookout for a skilled Reactor Operations Engineer to develop and implement essential procedures for our innovative nuclear microreactor technology. This position presents an extraordinary chance to merge engineering, operations, and human factors in a highly technical and regulated setting. You will work alongside a diverse team to transform intricate hardware and software designs into clear, actionable procedures that comply with DOE and NRC standards. Your efforts will empower Reactor Operators (ROs) and Senior Reactor Operators (SROs) to efficiently and safely conduct testing, commissioning, and operational activities.This role transcends traditional systems engineering; you'll also gain practical experience as a Reactor Operator (RO), directly shaping the development of operational software, procedures, and digital twin simulations. Your contributions will play a vital role in enhancing operator efficiency, safety, and the real-world execution of our state-of-the-art microreactors.

Nuclear EngineerJoin Radiant Industries, a pioneering leader in advanced nuclear technology, as a Nuclear Engineer. You will play a crucial role in shaping the future of our Kaleidos microreactor. Your responsibilities will encompass a variety of nuclear engineering disciplines including radiation shielding, criticality safety, accident dose consequence assessment, reactor physics modeling, transient analysis, and radiation detection. Collaborating with a dynamic team in a startup atmosphere, you will spearhead nuclear engineering projects, set strategic directions, and tackle complex technical challenges. The ideal candidate is not only detail-oriented but also possesses a profound passion for advanced reactor design and exhibits exemplary communication skills.Key Responsibilities:Lead nuclear design and analysis initiatives, including:Shielding: Conduct operational dose and shutdown activation analysis, categorize waste, and ensure compliance with customer and regulatory shielding requirements.Neutronics: Perform analysis of reactor fluxes and energy deposition, ensure criticality safety, and validate nuclear models.Accident and Dose Consequence: Assess radiological dose consequences for diverse accident scenarios related to the Kaleidos units.Transient Analysis: Execute coupled neutronics and thermal calculations to deepen understanding of reactor dynamics.Gather requirements and provide constructive feedback to engineers across various domains through effective communication.Undertake additional nuclear design and analysis tasks as assigned.Qualifications & Skills:Bachelor’s degree in Nuclear Engineering or a related field from an accredited institution.1-2+ years of relevant industry experience (a Master’s degree equates to 2 years).Proficiency in radiation transport methods with experience in MCNP/OpenMC/Serpent codes.Skilled in at least one programming language, such as Python, C++, C#, FORTRAN, or other scientific computing languages.Basic understanding of thermal hydraulics principles.Self-motivated with robust organizational, written, and oral communication skills.

Join picogrid as a Field Operations Engineer and play a pivotal role in enhancing operational efficiency and driving performance. In this dynamic position, you will be responsible for overseeing field operations, ensuring the successful implementation of projects, and collaborating with cross-functional teams to deliver innovative solutions.

Vardaspace is seeking a Mission Operations and Automation Engineer in El Segundo, California. This role centers on improving automation within mission operations for advanced space technologies. Role overview Work closely with teams from different disciplines to refine and implement automation processes. The focus is on increasing operational efficiency and reliability, directly supporting mission success. Impact The Mission Operations and Automation Engineer will help strengthen Vardaspace’s mission operations and contribute to the development of new space solutions. Collaboration and technical insight are key to supporting ongoing and future projects.

Radiant Industries is seeking a talented Nuclear Engineer specializing in Core Physics to join our dynamic team. In this pivotal role, you will be responsible for the design and execution of nuclear-specific testing operations for our upcoming 2026 demonstration. Your expertise will be crucial in developing a substantial portion of our test campaign, ensuring that all proposed testing is not only safe but also aligns with the objectives set forth. You will collaborate closely with fellow nuclear engineers to establish success criteria and work alongside systems and operations engineers to implement comprehensive written procedures.

The Manager of Security Operations at Mattel, Inc. oversees efforts to protect company assets and maintain a safe environment for employees. This leadership role is based in El Segundo and centers on both proactive and responsive security measures. Role overview This position leads a team responsible for implementing and managing security protocols. The manager organizes risk assessments and coordinates responses to security incidents, ensuring procedures are followed and improvements are made as needed. Collaboration Success in this role depends on working closely with other departments. The manager brings a strategic approach to security, partnering across teams to strengthen Mattel’s overall security posture. What you will do Lead and support a dedicated security operations team Develop, implement, and manage security protocols Conduct risk assessments to identify and address vulnerabilities Respond to security incidents and coordinate effective resolutions Collaborate with other departments to enhance security practices

Join Mattel Digital Studios as the Director of Business Operations, where you'll play a pivotal role in driving operational excellence and fostering innovative strategies. Your leadership will guide cross-functional teams to enhance our digital initiatives and ensure seamless business processes.

The Office of the Commissioner is on the lookout for a dedicated Part-Time Broadcast Engineer to bolster the MLB Replay Operations Center, serving all 30 Major League Baseball Clubs.Key Responsibilities:Monitor and document equipment status while validating incoming video streams for Replay operations.Collaborate with various MLB departments to address technical requests effectively.Engage with broadcast partners to gather and confirm video transmission specifics.Ensure meticulous and precise technical documentation is maintained.Support preventive maintenance and troubleshoot all broadcast and replay devices.Oversee the installation, upkeep, and support of intricate broadcast systems and infrastructure.Exhibit adaptability by modifying responsibilities as new opportunities and technologies emerge.Diagnose technical issues within facilities, including control rooms, broadcast equipment, and computer systems.Facilitate camera acquisition and integration with regional sports networks.

Join Mattel, Inc. as a Senior Analyst in Digital Operations, where you will play a crucial role in optimizing our digital platforms and operations. You will collaborate with cross-functional teams to analyze data, enhance user experiences, and drive strategic initiatives. This role offers a unique opportunity to influence our digital strategy and contribute to the growth of one of the world's leading toy companies.

Join picogrid as an Operations & Logistics Coordinator, where you will play a pivotal role in enhancing our operational efficiency and enabling seamless logistics processes. In this dynamic position, you will collaborate with cross-functional teams to ensure timely delivery of products and services.Your responsibilities will include managing inventory levels, coordinating shipments, and optimizing supply chain processes to meet organizational goals. We are looking for a proactive individual who is passionate about logistics and operations, and who thrives in a fast-paced environment.

Role Overview Picogrid is hiring a Strategy & Business Operations Lead in El Segundo, CA. This position shapes company strategy and strengthens operational effectiveness. The role works closely with teams across the business to develop strategies, improve processes, and support overall business performance. What You Will Do Collaborate with different departments to identify and implement strategic initiatives Analyze and refine business processes to improve efficiency Support company growth by driving operational improvements Contribute to projects that deliver value to clients

Join vardaspace as a Mission Operations Intern for Fall 2026, where you will have the opportunity to engage in groundbreaking space operations and contribute to missions that truly matter. This internship is designed for aspiring professionals who are eager to learn and grow in a fast-paced environment.

Role overview The Lead Sales and Operations Planning Analyst at Mattel, Inc. guides the operational planning process to help products reach consumers smoothly and on time. This role sits in El Segundo and works closely with teams across the company to review data, forecast demand, and shape strategies that support business goals. What you will do Lead cross-functional groups through sales and operations planning cycles Analyze supply chain and sales data to inform decisions Forecast product demand and adjust plans as needed Develop strategies that align with company objectives Work environment This position influences supply chain operations and collaborates with a variety of teams. The work is both analytical and strategic, with a focus on improving how Mattel’s products move from planning to delivery.

Join VardaSpace as a Structures Engineer, where you will be at the forefront of innovative aerospace engineering solutions. You will work on the design, analysis, and testing of structural components for our cutting-edge spacecraft, contributing to projects that aim to revolutionize the space industry.

About Varda Space Industries Low Earth orbit is open for business. Varda Space Industries develops commercial space infrastructure, with a focus on in-orbit pharmaceutical manufacturing and affordable reentry capsules. Space offers unique opportunities, from producing life-saving medicines to creating advanced fiber optics that can only be made in orbit. Varda’s mission is to build the products and infrastructure that connect space innovation directly to life on Earth, expanding economic possibilities for humanity. The team brings experience from SpaceX, Blue Origin, top pharmaceutical companies, and Silicon Valley. Varda was founded in January 2021 by Will Bruey and Delian Asparouhov, and is backed by investors including Khosla Ventures, Lux Capital, Founders Fund, Caffeinated Capital, General Catalyst, and Also Capital. Headquartered in El Segundo, California, Varda operates a production facility for developing, integrating, and testing vehicles, equipment, and materials. Additional offices are located in Washington, DC, and Huntsville, Alabama. Varda is building the foundation for a thriving in-space ecosystem.

Senior Manufacturing EngineerJoin Radiant Industries as a Senior Manufacturing Engineer, where you will collaborate with design engineers to revolutionize the production of intricate mechanisms and structures essential to our innovative microreactor technology. Your role will be critical in ensuring the reliability, safety, quality, and timely delivery of the Kaleidos demonstration unit, set for testing at the Idaho National Lab in 2026—marking the first new reactor design in over 50 years.Key Responsibilities:Oversee the manufacturing and inspection processes of vital components and assemblies within the Kaleidos microreactor.Collaborate with design engineers to create innovative production methods for complex mechanisms and structures.Develop, validate, and optimize manufacturing processes to fulfill all design and business requirements, including safety, quality, efficiency, and delivery timelines.Formulate and implement manufacturing specifications and fabrication instructions.Manage the manufacturing bill of materials (mBOM) for components and assemblies.Identify, evaluate, and establish partnerships with suppliers for component sourcing and fabrication.Identify, plan, and execute upgrades to capital equipment, machinery, and layout to adapt to evolving production needs.Lead initiatives that promote continuous improvements in manufacturing processes and product quality.

Role OverviewRadiant Industries is on the lookout for a skilled Loads & Dynamics Engineer to lead and conduct structural loads, vibration, and dynamic analyses for intricate mechanical systems associated with Kaleidos, the world's first portable microreactor and its supporting hardware. In this pivotal role, you will ensure the structural integrity and durability throughout the product lifecycle, covering all aspects from manufacturing to deployment and operational environments.This position requires a proactive engineer who thrives in fast-paced, ambiguous settings and collaborates effectively with teams in structures, mechanical design, thermal, nuclear, and testing disciplines.Key ResponsibilitiesDevelop and manage static, dynamic, and transient load analysis for reactor systems, support structures, and transport configurations.Conduct structural dynamics analyses, including modal, random vibration, shock, sine vibration, and fatigue assessments.Implement explicit dynamics simulations to model nonlinear reactor responses during transient seismic and transportation events.Define and analyze transportation and handling environments, addressing shock and vibration from road, rail, air, or sea transport.Generate load cases and environments to support structural sizing, design margins, and verification plans.Conduct finite element analyses (FEA) using tools such as ANSYS and Abaqus.Work collaboratively with design engineers to influence hardware architecture, material selection, and joint design.Assist in test planning and correlation, including shaker tests, modal surveys, and structural verification testing.Create and maintain analysis documentation, reports, and requirements for internal reviews and regulatory interfaces.Contribute to failure investigations, root cause analyses, and design enhancements.Help establish best practices for loads, dynamics, and structural verification within a growing engineering organization.

Join CX2, a pioneering defense technology firm dedicated to achieving spectrum superiority for the United States and its allies. Our cutting-edge, AI-integrated hardware and software solutions are designed to detect, disrupt, and safeguard the electromagnetic spectrum across land, air, sea, and space.We are currently on the lookout for a proactive Hardware Test Engineer to spearhead the development and execution of testing protocols for our hardware products in a dynamic manufacturing setting. In this role, you will be instrumental in validating product performance, reliability, and compliance by designing test procedures, fixtures, and automated testing systems. This position will support both new product introductions (NPI) and high-volume production efforts at our headquarters in El Segundo, CA.

Role overview Radiant Industries is hiring a Principal Turbomachinery Engineer to act as the Responsible Engineer for advanced turbomachinery within a nuclear-driven power generation system. The focus is on the mechanical design, reliability, and performance of the main rotating assembly in a 1MW closed-loop Brayton cycle. This position requires deep technical ownership of complex, high-speed rotating equipment. What you will do Lead the mechanical architecture for high-speed rotating equipment that operates under extreme temperatures, pressures, and rotational speeds. Guide technical work in rotor dynamics, structural integrity, bearings, seals, and system integration. Collaborate with electrical, thermal, and manufacturing teams to ensure integration across disciplines. Maintain end-to-end responsibility from concept through production, emphasizing technical rigor and sound engineering judgment. Requirements Extensive experience designing and analyzing turbomachinery, with a focus on high-speed rotating hardware. Strong knowledge of rotor dynamics, structural assessment, bearing and seal selection, and system-level integration. Hands-on approach with a track record of delivering production-ready hardware. Ability to work effectively with specialists in electrical, thermal, and manufacturing engineering. Location This position is based in El Segundo, CA.

Join cx2 as an FPGA Engineer, where you will design, develop, and implement advanced FPGA solutions for cutting-edge applications. You will collaborate with a dynamic team of engineers and contribute to innovative projects that push the boundaries of technology.