Nuclear Engineer - Core Physics

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, ensurin…

About Radiant IndustriesRadiant Industries, headquartered in El Segundo, CA, is pioneering the development of the world’s first mass-produced portable nuclear microreactors. Our flagship reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor designed for mobility, capable of providing power for up to five years without the need for refueling. This innovative technology serves as a sustainable alternative to diesel generators, delivering essential power to hospitals, data centers, remote sites, and military bases. Leveraging modern software engineering and advanced materials, we aim to revolutionize nuclear energy. Founded in 2020, we are poised to test our inaugural reactor at the Idaho National Laboratory in the coming year, with commercial deployments targeted for 2028.About the RoleWe are looking for a dynamic and driven early-career Mechanical Engineer to join our team and contribute to the design and integration of electrical systems within our innovative projects. In this role, you will collaborate with seasoned mechanical and electrical engineers to tackle complex challenges related to packaging, thermal management, structural design, and overall system integration for cutting-edge hardware. This position offers a unique opportunity for hands-on experience throughout the entire hardware development process, from CAD design and analysis to testing and validation, all while supporting our mission to successfully launch the first commercial nuclear reactor in over five decades by 2026.Responsibilities & DutiesContribute to the mechanical design and oversight of electrical components and subsystems, including:Designing mechanical assemblies for electrical components such as control panels, enclosures, brackets, mounts, and supports.Routing and securing cables and wiring harnesses, ensuring strain relief, compliance with bend radius, and serviceability.Integrating sensors, actuators, connectors, and electrical hardware within limited spaces.Creating 3D CAD models and 2D drawings using Siemens NX, including tolerance stack-ups and GD&T fundamentals.Conducting initial load calculations (static, shock, vibration) to guide structural design.Performing thermal analyses and heat transfer evaluations for electrical components and assemblies.Assisting in the selection of suitable materials, fasteners, and finishes based on electrical, thermal, and environmental considerations.

Senior Mechanical Engineer – Turbomachinery RotordynamicsRadiant Industries is on the lookout for a dynamic and experienced Senior Mechanical Engineer to join our innovative team. This pivotal role focuses on the power generation and primary cooling turbomachinery linked to our advanced Kaleidos product. As a key contributor, you will conduct thorough rotordynamic analyses and select appropriate bearings for high-speed rotating machinery, which includes compressors, turbines, and pumps designed for high-temperature applications. The ideal candidate will possess a robust background in rotordynamics and bearing selection, complemented by practical experience in hardware testing.Responsibilities:Design, construct, and evaluate turbomachinery for Radiant’s power generation systems.Conduct dynamic analyses of rotor-bearing systems to assess vibrational behavior, stability, and resonance attributes.Perform critical speed and Campbell diagram analyses, alongside stability assessments, to enhance rotor system designs for reduced vibration and resonance.Examine rotor response during transient operating conditions, including startups, shutdowns, and off-design operations.Select suitable bearing types (e.g., rolling element, fluid film, magnetic) based on operating conditions and performance needs. Assess bearing loads, lifespan, and thermal efficiency.Compile technical reports, design documentation, and presentation materials.Assist in the assembly and testing of prototypes, initial articles, and production hardware.Required Qualifications:Bachelor’s or Master’s degree in Mechanical Engineering or a related field.A minimum of 5 years’ experience in designing and analyzing turbomachinery, rotating equipment, or mechanisms.Solid grasp of rotordynamic principles and relevant tools (e.g., XLrotor, Dyrobes, or equivalent).Exceptional problem-solving, technical communication, and organizational skills.Desired Qualifications:Experience in power generation applications.Expertise in bearing selection for high-temperature, high-speed applications.Practical experience with turbomachinery testing and instrumentation.

Lead Nuclear EngineerRadiant Industries is on the lookout for a dynamic and technically proficient leader to head our nuclear design and analysis team, specializing in core physics, shielding, instrumentation & controls, and reactor operations. In this pivotal role, you will guide a talented team through the intricate design, development, and testing phases of the innovative Kaleidos microreactor project. You will be responsible for managing schedules, budgets, hiring, and the successful execution of nuclear-related objectives, with a strong emphasis on safety, reliability, portability, and performance. The ideal candidate thrives in interdisciplinary settings, collaborates effectively with engineers and leadership, possesses a deep understanding of engineering principles, excels in creative problem-solving, and is passionate about mentoring and inspiring engineers to achieve their best work. Join us in our mission to bring the first portable nuclear microreactor to market.Key Responsibilities:Lead a multidisciplinary team of nuclear engineers focused on safety analyses, core performance, shielding—including operational dose, activation, shutdown dose—instrumentation & controls, operations, and thermal-hydraulics.Recruit, mentor, and develop a high-performing team of nuclear engineers.Oversee nuclear engineering projects from inception to completion, including requirements gathering, iterative design, simulation pipeline development, and regulatory deliverables.Collaborate with the regulatory team to ensure compliance with nuclear industry standards and requirements.Provide mentorship to engineers through constructive feedback and coaching.

Join Sonsoft Inc. as a Quality Assurance Engineer specializing in performance testing with tools like JMeter and LoadRunner. In this role, you will ensure the reliability and functionality of our software products by developing and executing performance test plans, identifying bottlenecks, and collaborating with cross-functional teams to enhance product quality. Your expertise will be critical in helping us deliver exceptional software solutions to our clients.

For over 50 years, ENSCO has delivered cutting-edge engineering, scientific, and advanced technology solutions to both government entities and private sectors across the globe.At ENSCO, we take pride in our commitment to pioneering advanced technologies that ensure mission success. Our team excels in systems engineering, integration, and advanced technology services that enhance the safety, security, and resilience of critical operations on land, in the air, in space, and within the interconnected information systems that link these domains.Learn more about ENSCO.Position DescriptionENSCO Inc. is on the lookout for a talented SATCOM Requirements Systems Engineer to join our dynamic systems engineering team. This pivotal role involves defining the next generation of space communication systems tailored to support the United States Space Force (USSF) satellite communications. The selected candidate will engage in Systems Engineering & Integration (SE&I) activities within a multidisciplinary and collaborative setting. Key responsibilities include interfacing and working alongside SE&I team members, contractors, government personnel, and USSF representatives. The candidate will lead and facilitate multiple working groups, driving technical discussions, identifying risks and requirement gaps, creating briefings, documenting action items, and taking meeting minutes.The MILSATCOM Systems Engineering, Integration, and Test (MSEIT) initiative provides state-of-the-art SE&I support for the US Space Force's Space Systems Center (SSC). Our mission is to assist the Space Force in acquiring advanced satellite communications systems that offer global secure, survivable, and protected communications for our nation’s military personnel. We are looking for innovative individuals who thrive in a collaborative environment, utilizing the latest tools and methodologies to address the complexities of integrating advanced space and ground communications systems. This position is based in El Segundo, CA, and includes various responsibilities, such as:Supporting Model-Based Systems Engineering (MBSE) activities to facilitate the development and maintenance of technical requirements.

The ESS Test and Evaluation Engineer role at Ensco, Inc. offers an exciting opportunity to contribute to the field of engineering in a dynamic and innovative environment. You will be responsible for developing, implementing, and executing test plans, ensuring that all systems meet rigorous quality standards. Your expertise in testing methodologies will be essential in evaluating system performance and identifying necessary improvements.

Join Voyager Technologies Inc. as an Electrical Engineer in Advanced Development. We are looking for innovative thinkers with a passion for technology and engineering to contribute to cutting-edge projects. In this role, you will work on advanced electrical engineering solutions, collaborating with a dynamic team of professionals to push the boundaries of technology.

vardaspace is hiring a Mid-Level Data Engineer for its El Segundo, California office. This role centers on building and maintaining data solutions that support business decision-making across the company. Key Responsibilities Design and implement data pipelines that handle complex datasets Maintain the integrity of data and ensure it remains accessible for analysis Collaborate with data scientists and analysts to strengthen data infrastructure and improve analytics tools Collaboration The Mid-Level Data Engineer works within the data engineering group and regularly partners with colleagues in data science and analytics. This position offers the chance to contribute to projects that shape how data is used throughout vardaspace.

Join Matter Intelligence as an Early Career Test Engineer specializing in advanced sensor technology. In this dynamic role, you will collaborate with cross-functional teams to design, implement, and execute tests that ensure the reliability and performance of our cutting-edge sensor products. You will have the opportunity to contribute to innovative projects that shape the future of technology.

Regulatory EngineerRadiant Industries is on the lookout for an innovative and passionate Regulatory Systems Engineer. In this pivotal role, you will be instrumental in facilitating the license application approval process with the Nuclear Regulatory Commission, contributing to the commercialization of the world’s first portable nuclear microreactor. As a subject matter expert on regulatory processes, you will engage collaboratively with technical teams to guide the design, build, and testing phases. Your leadership will bridge communication between regulators and engineering teams, ensuring clarity on regulatory requirements. You will synthesize analysis and test results from design teams, producing comprehensive deliverables that constitute a complete license application. This role is ideal for systems engineers who thrive in both technical and operational environments, as you will take ownership of a modernized regulatory strategy aimed at bringing a safe microreactor to market swiftly.

Senior Motor Design EngineerJoin Radiant Industries as a Senior Motor Design Engineer, where you will play a pivotal role in designing and developing an advanced alternator for our nuclear-powered high-speed generator. This position entails the design of active components as well as conducting structural and thermal analyses of high-speed generators. You will work collaboratively with cross-functional engineering teams and closely engage with the Power Conversion and Electrical Systems team responsible for efficiently converting mechanical energy into electrical energy, ensuring safety and reliability for our clients. As the ideal candidate, you will take ownership of the active part design for generators, and will also be responsible for conducting simulations, performing analysis, and selecting components. Your contributions will directly impact the commercialization of groundbreaking mass-produced nuclear reactors, delivering clean energy to remote areas and critical infrastructure.

About the RoleRadiant Industries is on the lookout for a seasoned Senior Electrical Engineer specializing in digital signal processing (DSP). In this pivotal role, you will spearhead the design and development of innovative signal processing and data acquisition architectures for terrestrial reactor control systems, with aspirations for future applications in space reactor technologies. As the technical authority in real-time signal processing, you will be responsible for the entire lifecycle of DSP pipeline development—from defining requirements and developing algorithms to implementation, validation, and deployment.Your focus will be on comprehensive DSP development, which encompasses digital filtering, detection, estimation algorithms, and real-time processing on embedded processors and FPGA platforms. Collaborating closely with hardware teams, you will ensure the effective interfacing with mixed-signal systems (including ADC/DACs and sensors), thereby guaranteeing precise sampling, low-noise signal conditioning, and reliability in high-stakes reactor control environments.

Senior Tooling EngineerRadiant Industries is actively searching for an enthusiastic and skilled Senior Tooling Engineer. In this pivotal role, you will collaborate closely with design engineers and the manufacturing team to craft and innovate bespoke tooling solutions essential for the development and assembly of our cutting-edge microreactor system. Join our early-stage team tasked with creating production tooling for our factory, which will mass-produce, fuel, and refuel Kaleidos.Key ResponsibilitiesCollaborate with design and manufacturing engineers to create innovative production tooling for the fabrication and assembly of complex mechanisms and structures.Design, analyze, and construct tooling that facilitates semi-remote operations for the fueling and defueling of reactors.Identify and establish relationships with suitable suppliers for tooling components and fabrication processes.Essential Skills and QualificationsBachelor’s degree in mechanical, manufacturing, or a related engineering discipline from an accredited institution.A minimum of 4 years of experience in mechanical tooling design and fabrication of multi-component assemblies using CAD software (NX or similar).Strong understanding of Geometric Dimensioning & Tolerancing (GD&T) and its application in fabrication drawings.Preferred Skills and QualificationsMaster’s degree in mechanical, manufacturing, or a related engineering discipline from an accredited institution.Expertise in both manual analytical methods and advanced finite element analysis techniques.Self-starter with excellent organizational, written, and verbal communication skills.Experience in custom machine design, including electromechanical systems, motors, actuators, linear rails, bearings, and lifting/rigging systems.Exceptional problem-solving abilities and meticulous attention to detail.Proven track record of successful collaboration with design and operations teams.Additional RequirementsWillingness to work extended hours and weekends as required to meet company objectives.Must be available for 100% onsite work at the El Segundo headquarters.Benefits and PerksCompetitive salary and performance-based bonuses.Health insurance, dental and vision coverage.401k retirement plan with company matching.Paid time off and holidays.Opportunities for professional development and training.

make-rain develops autonomous drone fleets and weather modification technology aimed at improving global freshwater access and supporting agriculture. The team tackles large-scale projects using cloud seeding and related techniques to address water scarcity challenges. Role overview This Senior PX4 Developer position is based in El Segundo, CA. The role centers on advancing drone autonomy and embedded systems, with a particular focus on PX4 firmware development and simulation testing. As part of the engineering team, this person will work on projects that push the boundaries of drone technology for environmental impact. What you will do Lead technical efforts within the drone autonomy software stack, acting as a subject matter expert Adapt and enhance PX4 firmware to meet specific mission requirements and flight behaviors Develop embedded firmware, including work on power management, integrating peripherals, and supporting sensors Set up and execute simulation tests using Gazebo, HITL, and SITL environments Support flight testing, analyze flight logs, and troubleshoot software issues as they arise Requirements Extensive programming experience in C and C++ Solid understanding of drone flight dynamics and control systems Hands-on experience with simulation tools and testing workflows Comfortable working independently and making technical decisions Willingness to relocate to El Segundo, California

Join Radiant Industries as a Lead Test Engineer for Power Generation Systems, where you will spearhead the strategy and execution of testing for our innovative power generation systems, encompassing turbomachinery, heat exchangers, controls, and primary cooling systems. This position is perfect for a hands-on technical leader who takes pride in developing test infrastructures, managing complex hardware operations, and mentoring engineering talent while being actively engaged in daily testing activities.In this role, you will take charge of the testing development for our high-speed machinery and build our testing facilities from the ground up. These infrastructures will be pivotal for rapid design iterations, focusing on evaluating vibration, performance, thermal behavior, and system reliability, ultimately facilitating a smooth transition into production acceptance testing. You will collaborate closely with mechanical design, analysis, manufacturing, and operations teams to validate and ensure that turbomachinery designs meet production standards.

About VardaLow Earth orbit is open for business. Varda is pioneering the advancement of commercial space infrastructure, from in-orbit pharmaceutical manufacturing to innovative and cost-effective reentry capsules.Our mission is to harness the potential of space to create products that enhance life on Earth, including essential pharmaceuticals and advanced fiber optics. We aim to drive innovation in the orbital economy by establishing the necessary infrastructure and products.Our team combines expertise from veterans of SpaceX, Blue Origin, leading pharmaceutical firms, and Silicon Valley innovators. Founded in January 2021 by Will Bruey and Delian Asparouhov, Varda has secured significant investment from renowned backers such as Khosla Ventures, Lux Capital, Founders Fund, Caffeinated Capital, General Catalyst, and Also Capital.Headquartered in El Segundo, California, Varda operates a production facility where we design, integrate, and test our vehicles, equipment, and materials. We also have offices in Washington, DC, and Huntsville, AL.Join us at Varda and contribute to building a vibrant in-space ecosystem.

Radiant Industries is on the lookout for an accomplished Senior Structural Engineer to spearhead the design and development of essential structures within our innovative Kaleidos project. In this pivotal role, you will tackle unique engineering challenges to create efficient and robust structures capable of sustaining fission reactions, even under extreme temperature conditions and stringent volumetric constraints.Your responsibilities will encompass conducting trade studies, selecting appropriate materials, performing comprehensive structural analyses, as well as overseeing assembly, integration, and testing processes. Your contributions will be instrumental in propelling the launch of the first new commercial reactor design in over half a century by the year 2026.

About VardaThe era of low Earth orbit is here, and Varda is leading the charge. We are pioneering the evolution of commercial space infrastructure, ranging from in-orbit pharmaceutical production to the development of cost-effective reentry capsules.Our groundbreaking work allows for the creation of life-changing products that can only be manufactured in space, enhancing life on Earth. Varda is committed to igniting innovation in the orbital economy by building the products and infrastructure that directly benefit humanity. Our mission is to broaden the economic horizons of mankind.Our team combines a wealth of experience, with leaders and staff sourced from esteemed organizations like SpaceX, Blue Origin, and major pharmaceutical firms, complemented by expertise from Silicon Valley. Founded in January 2021 by Will Bruey and Delian Asparouhov, we are backed by top-tier investors including Khosla Ventures, Lux Capital, and Founders Fund.Headquartered in El Segundo, California, our office and production facility are where we design, integrate, and test our innovative vehicles, equipment, and materials. We also maintain offices in Washington, DC and Huntsville, AL.Join us at Varda and contribute to building a thriving in-space ecosystem. About This RoleAs a Manufacturing Engineer at Varda, you will leverage your expertise to transition manufacturing processes from a handful of custom vehicles to a large number of consistent, simultaneous builds. Your role will be critical in enhancing Varda's manufacturing capabilities.

We are looking for a skilled Hardware Test Engineer to join our dynamic team at usm2. This is an exciting opportunity for individuals who are passionate about testing and verifying hardware systems. You will be responsible for developing and executing test plans, troubleshooting hardware issues, and ensuring product quality meets the highest standards.