Mechanical Engineer - Fluid Systems at Radiant Industries | El Segundo

Join Radiant Industries as a Mechanical Engineer specializing in Fluid SystemsWe are on the lookout for a dynamic Mechanical Engineer to take the helm of our Kaleidos fluid systems, guiding them from initial design through to production. This role involves working with critical subsystems, including the primary loop and power conversion loop, which play a pi…

Radiant Industries is on the forefront of innovative engineering solutions, and we are looking for a highly skilled Senior Mechanical Engineer (Structures) to join our team. In this pivotal role, you will design and develop critical structural components within our Kaleidos project, tackling unique challenges to create efficient and reliable structures that can withstand extreme temperature environments and adhere to volumetric constraints.As a Senior Mechanical Engineer, you will play a crucial role in the advancement of the first new commercial reactor design in over 50 years, set to launch by 2026. Your responsibilities will include conducting trade studies, material selection, detailed structural analysis, assembly, integration, and testing.

Join Radiant Industries as a passionate and driven Mechanical Engineer in Fluid Systems - 2026 New Graduate within our KDU Engineering team. You will play a pivotal role in the design, assembly, and testing of the Kaleidos Development Unit (KDU) – marking the United States’ first new fueled reactor design in over half a century. This is your chance to take ownership of significant projects that drive KDU’s readiness for fueled operations while collaborating with a diverse team of engineers.Key ResponsibilitiesParticipate actively in the design, analysis, and testing of fluid subsystems for the KDU.Take full ownership of deliverables from initial concept through to build and validation, with mentorship from senior engineers.Work collaboratively across disciplines to integrate designs and solve technical challenges.Assist in system-level testing, troubleshooting, and iterative design processes to expedite KDU development.Effectively communicate results through design reviews, technical reports, and presentations to team members and leadership.Required Skills and QualificationsBachelor's degree in Mechanical Engineering, Aerospace Engineering, or a related field (completed or expected by Spring 2026).Strong grounding in engineering fundamentals, particularly in thermodynamics and fluid mechanics.Hands-on experience in design and construction through projects, research, lab work, or internships.Proficiency with engineering tools such as CAD, analysis software, and laboratory instrumentation.Preferred Skills and QualificationsMaster's degree in Mechanical Engineering, Aerospace Engineering, or a related discipline (completed or currently pursuing).Relevant internship, co-op, or project experience pertaining to fluid systems.Ability to independently tackle complex engineering challenges and proactively seek resources.Adept at thriving in a dynamic, startup environment with a collaborative, mission-oriented approach.Genuine enthusiasm for Radiant’s mission to swiftly deploy nuclear microreactors in remote areas requiring sustainable, clean energy.Familiarity with reactor physics is advantageous but not mandatory.Additional InformationThis position is located on-site at Radiant’s headquarters in El Segundo, California.

Radiant Industries is on the lookout for a Business Systems Analyst who will play a pivotal role in shaping our strategic initiatives aimed at enhancing data-driven decision-making throughout the organization. This position is integral to the development and execution of Radiant’s digital transformation roadmap, ensuring ongoing support for our digital ecosystem. As a key stakeholder in our data architecture development, you will advocate for effective data utilization within cross-functional business intelligence projects. We are seeking a detail-oriented, collaborative individual who is keen to expand their expertise in highly regulated industries.Key Responsibilities:Lead the mapping of business processes, identifying and documenting system requirements to create a consolidated roadmap for digital transformation.Contribute significantly to enterprise system evaluations, ensuring the best fit for business needs while providing critical insights on system configuration and ongoing support.Oversee business intelligence projects from initiation to completion, managing scope definition, resource allocation, timeline management, delivery, maintenance, and executive reporting.Collaborate with cross-functional teams to gather requirements, translate data insights into actionable business recommendations and strategic initiatives for stakeholders.Design, develop, and maintain data models and pipelines that support reporting and analytics initiatives, including the creation of dashboards and reports utilizing BI tools such as Power BI.Work closely with the Software Team and IT to guide the development of sustainable and scalable data architecture, ETL processes, and data warehousing solutions to meet downstream data needs.Expected Deliverables:Partner with cross-functional business leaders to ensure the development and execution of a digital transformation roadmap through enterprise system selection, implementation, and rollout.Develop and maintain scalable BI visual tools and reports that effectively track and display key metrics such as schedule adherence, milestone progression, on-time delivery, performance, and resource utilization.Generate comprehensive reporting that aligns business objectives with facility readiness, regulatory compliance, and production plans.

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.

Engineering TechnicianJoin Radiant Industries as an Engineering Technician, where you will utilize a diverse array of skills in the fabrication and assembly of our innovative microreactor unit. Your role will be pivotal in constructing both large and small-scale test rigs, creating prototype components and tooling, and sourcing the necessary tools for assembly. You will be the fourth key technician on our team, necessitating a high level of autonomy and initiative. In our new El Segundo headquarters, you will manage our prototype shop, working with an assortment of tools across various shop activities, including machining, welding, metal forming, electrical work, and plumbing. This position offers you the chance to make a substantial technical impact as we strive to fuel a new reactor design for the first time in over 50 years by 2026.Key Responsibilities:Fabricate components to specifications using various shop equipment such as mills, lathes, welders, and hand tools.Lead the assembly and commissioning of test rigs and production builds.Conduct troubleshooting and root cause analysis for mechanical, electrical, thermal, and pneumatic issues.Collaborate with engineers to devise solutions and enhancements for hardware design, fabrication, and assembly processes.Maintain high operational standards regarding safety, reliability, and cleanliness.Perform additional tasks as required; versatility is essential in our small team environment.

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.

About RadiantRadiant Industries, based in El Segundo, California, 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 anywhere it is needed for up to five years without refueling. This innovative solution offers a sustainable alternative to diesel generators, delivering essential energy support for hospitals, data centers, remote installations, and military bases. By integrating modern software engineering with nuclear technology, we are committed to delivering safe, factory-built microreactors utilizing proven materials. Founded in 2020, we are poised to conduct our first reactor test at the Idaho National Laboratory next year, with initial customer deliveries scheduled to commence in 2028.About the RoleWe are looking for a dedicated Senior Power Systems Engineer to spearhead the design, modeling, and validation of electrical power systems integral to our nuclear microreactor platform. In this pivotal role, you will define the mechanisms of power generation, conditioning, control, and distribution across various environments including grid-connected, islanded, and rapidly deployable settings.You will manage power system studies, from initial architectural considerations to thorough modeling, testing, and validation. Collaborating closely with teams from electrical design, controls, turbomachinery, nuclear, thermal, and software, your efforts will ensure safe, stable, and reliable power delivery under diverse operational and contingency scenarios. This role is crucial to the commercialization of the world's first mass-produced portable nuclear reactors.Responsibilities and Duties:Lead power system modeling and analysis for microreactor power generation systems in both grid-connected and islanded modes.Create and maintain steady-state, dynamic, and electromagnetic transient (EMT) models representing generation assets, loads, protective schemes, and supervisory controls.Conduct power flow, fault analysis, protection coordination, and system stability studies to validate system performance across normal and contingency situations.Assess system behavior during disturbances such as load changes, faults, breaker operations, and generation loss events.Assist in design trade studies to enhance power system architecture, control strategies, and equipment selection.Collaborate cross-functionally to ensure integrated solutions that meet the highest standards of safety and efficiency.

Senior Structures EngineerRadiant Industries is on the lookout for a dynamic and innovative Senior Structures Engineer to lead the design and development of essential structures within the Kaleidos project. In this role, you will tackle unique engineering challenges, crafting efficient and robust structures that endure extreme temperatures and satisfy volumetric constraints. Your expertise will play a crucial role in advancing the first new commercial reactor design in over 50 years, set to launch by 2026.Key Responsibilities:Lead the design of critical structures, including mass-efficient transportable shielding systems, container systems, and high-temperature graphite and metallic systems.Conduct thorough trade studies and develop innovative designs to meet program specifications.Perform detailed thermomechanical (static strength, durability/fatigue) and dynamic analyses (vibration, shock) to ensure structural integrity, utilizing both manual calculations and finite element analysis tools.Create and implement manufacturing and assembly instructions, along with comprehensive test plans.Manage a Bill of Materials (BOM) and collaborate with suppliers for component development.Oversee subassembly design, manufacturing, and testing schedules.Conduct risk analysis (FMEA) for subsystems.Gather requirements and provide constructive guidance to engineers across different functional areas through effective communication.

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 Radiant IndustriesRadiant Industries is an innovative startup headquartered in El Segundo, California, pioneering the development of the world’s first mass-produced, portable nuclear microreactors. Our inaugural reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor designed for transportation to any location requiring power, capable of operating for up to 5 years without refueling. This cutting-edge technology offers a sustainable alternative to conventional diesel generators, providing essential power support for critical infrastructures such as hospitals, data centers, remote sites, and military bases. Since our inception in 2020, we have adopted a unique approach that combines advanced software engineering with proven materials to safely deliver factory-built microreactors. We are set to commence testing our first reactor at the Idaho National Laboratory next year, with initial customer deliveries projected to begin in 2028.Position OverviewWe are on the lookout for a motivated Senior FPGA Engineer to join our Embedded Systems team. In this role, you will play a crucial part in the design, development, and validation of FPGAs utilized in the reactor's instrumentation and control systems, focusing on safety-critical applications, sensor and actuator management, and communication systems. Collaboration with hardware engineers, embedded software engineers, and test engineers will be essential to create integrated designs that fulfill the operational requirements for monitoring and controlling fission reactors. Your contributions will be pivotal in testing our first commercial reactor design in over half a century.This position is full-time and based onsite in El Segundo, California.

Radiant Industries seeks an Executive Assistant based in El Segundo, CA. This position supports executive leadership by handling a variety of administrative responsibilities. The goal is to keep daily operations on track and ensure clear communication across the company. Key responsibilities Maintain and organize executive calendars and schedules Arrange meetings and coordinate logistics Prepare reports and manage documentation Support special projects as needed Requirements Strong organizational and time management abilities Keen attention to detail Comfort managing multiple tasks and shifting priorities Experience working in a high-energy environment

Senior Engineering TechnicianJoin Radiant Industries as a Senior Engineering Technician and leverage your diverse skill set in the fabrication and assembly of our cutting-edge microreactor unit. As a vital member of our team, you will play a key role in developing both large and small-scale test rigs, crafting prototype parts and tooling, and managing material handling. With significant autonomy, you will help establish and maintain our prototype shop at our new headquarters in El Segundo, California, utilizing your expertise in machining, welding, metal forming, electrical work, and plumbing. Your contributions will be instrumental in achieving the successful fueling of a groundbreaking reactor design by 2026.

Join Radiant Industries as a Senior Electrical Technician!In this pivotal role, you will leverage your expertise to support our engineering team in the development and assembly of cutting-edge electronic systems. Your contributions will ensure the reliability and functionality of our products, making a significant impact in the aerospace and military sectors.Responsibilities:Interpret and work with engineering drawings, electrical schematics, and wiring diagrams.Assemble, wire, and integrate hardware components such as PCBs, harnesses, electrical panels, and enclosures.Adhere to established procedures and specifications throughout the manufacturing process.Collaborate closely with engineers to enhance and document processes.Utilize manufacturing tools including soldering irons, cutters, strippers, crimpers, and torque wrenches with expertise.Conduct electromechanical tests such as continuity, hi-pot, and pull tests.Maintain a high standard of safety, cleanliness, and reliability in all operations.Demonstrate a solid understanding of electrical hardware and safe interaction practices.Required Skills:Experience with military or aerospace-grade electronics.Familiarity with high-power electronics and batteries.Understanding of production equipment and tooling for electromechanical manufacturing.Flexibility to support various projects aligned with company goals.Knowledge of NASA-STD-8739.4, IPC-A-610, IPC-A-620 standards.Experience with UL-508A and NFPA-70 (NEC) regulations.Preferred Qualifications:Ability to stand, bend, and work with small components for extended periods.Excellent vision and fine motor skills for precision work.Capability to lift up to 50 lbs occasionally.Strong teamwork, communication, and organizational skills.Positive attitude and ability to work effectively with minimal supervision.Strong organizational skills and attention to detail.Willingness to work outdoors when required.Ability to work at heights using scissor lifts or ladders as needed.Willingness to travel occasionally for offsite support.

Radiant Industries, based in El Segundo, CA, is at the forefront of clean energy innovation, pioneering the world’s first portable, zero-emissions nuclear microreactor. Our Kaleidos 1MW system is engineered to replace diesel generators in remote and mission-critical environments. As we gear up to test our development reactor by 2026, we aim to be the first new commercial reactor design to achieve a fueled test in over 50 years. To facilitate our journey towards commercialization, robust enterprise systems are essential for effective execution, compliance, and cost management.Position Overview: Production PlannerWe are looking for a dedicated Production Planner who will play a crucial role in ensuring that our production build plans align seamlessly with company milestones and are supported by comprehensive, accurate, and readily available material kits. This position is pivotal in converting production build operations and routing into kit readiness, identifying inventory deficiencies, coordinating shortage resolutions, and ensuring that both internal and external production activities are synchronized with build schedules. Additionally, the role includes overseeing material movement through our internal work centers.The Production Planner will collaborate closely with teams across Supply Chain, Warehouse, Quality, Engineering, and internal manufacturing to guarantee material availability, internal fabrication readiness, and that outside processing activities are effectively coordinated to support build execution. The ideal candidate should be detail-oriented, proactive, and adept at coordinating cross-functional teams to swiftly resolve operational challenges.

Join Radiant Industries as a Recruiting Coordinator (Full-Time)At Radiant Industries, we are on a mission to revolutionize the future of energy with our groundbreaking portable zero-carbon nuclear microreactor. We are looking for a meticulous and organized Recruiting Coordinator to become an integral part of our dynamic team in a fast-paced startup environment. In this pivotal role, you will enhance the candidate experience and streamline our recruiting operations, positioning us for effective scaling.The ideal candidate is someone who excels in organization, communication, and problem-solving. You will collaborate closely with recruiters, sourcers, and hiring managers to oversee interview scheduling, candidate communications, and recruitment systems. Additionally, you will play a key role in improving processes, ensuring data integrity, and generating reports that inform our hiring strategies.This position offers the unique opportunity to influence both the candidate journey and the operational framework that supports our innovative projects.

Senior Technical Talent SourcerRadiant Industries is on the lookout for an innovative, strategic, and mission-oriented Senior Technical Talent Sourcer. In this pivotal role, you will take charge of identifying and attracting elite talent within a dynamic, fast-paced startup ecosystem. You will be responsible for establishing and cultivating a strategic talent pipeline, leading outreach initiatives that empower Radiant to recruit exceptional engineers, operators, and innovators. The ideal candidate will excel in navigating ambiguity, possess a passion for discovering hidden talent, and take pride in their ability to connect with candidates who might otherwise be overlooked. Your collaboration with recruiters and hiring managers will be essential in understanding recruitment needs and crafting effective sourcing strategies that draw the industry's finest talent. This position offers a unique opportunity to shape the team responsible for delivering the world's first portable zero-carbon nuclear microreactor.Key Responsibilities:Collaborate closely with recruiters and hiring managers to gain a comprehensive understanding of role requirements and team objectives.Develop and implement innovative sourcing strategies to engage passive talent across technical and corporate sectors.Utilize a wide array of sourcing tools (LinkedIn Recruiter, Boolean search, networking, events, and specialized platforms) to create strong candidate pipelines.Execute personalized outreach campaigns that engage candidates with Radiant’s mission and opportunities.Maintain and manage candidate pipelines, ensuring data accuracy and organization.Represent Radiant at recruitment and networking events to enhance talent pools and promote our employer brand.Provide valuable market insights and talent intelligence to assist recruiters and hiring teams in shaping effective hiring strategies.Required Qualifications:Bachelor’s degree from an accredited institution or a minimum of 3 years of sourcing/recruiting experience, ideally within a technical company.Proven track record of successfully sourcing elusive, passive talent across diverse disciplines.Strong research and Boolean search capabilities, complemented by a creative mindset for candidate generation.Exceptional written and verbal communication skills, particularly in outreach and engagement.Ability to manage multiple searches concurrently in a high-pressure environment.Desired Qualifications:Familiarity with advanced sourcing techniques and tools.Experience in the energy sector or with innovative technology companies is a plus.

Radiant Industries is actively searching for a dynamic and strategic Indirect Procurement Manager. In this pivotal role, you will spearhead the sourcing, negotiation, and management of all goods and services across various indirect categories. Your expertise will be essential in cultivating a robust, cost-effective, and dependable supply chain.You will oversee a diverse range of categories such as Facilities, IT, Professional Services, MRO (Maintenance, Repair, and Operations), consumables, and intricate R&D partnerships. Collaborating closely with Engineering, Operations, Finance, and Production teams, you will ensure that our partners and suppliers consistently meet Radiant’s rigorous technical, quality, and commercial standards. The ideal candidate thrives in a fast-paced environment and exhibits exceptional negotiation skills, with a keen understanding of the complexities involved in sourcing specialized services in regulated sectors.

Join Radiant IndustriesRadiant Industries, based in El Segundo, CA, is pioneering the development of the world’s first mass-produced portable nuclear microreactors. Our flagship reactor, Kaleidos, is a revolutionary 1-megawatt microreactor designed for mobility and efficiency, capable of running for up to five years without refueling. This innovative solution provides a sustainable alternative to diesel generators, supporting critical operations for hospitals, data centers, remote locations, and military installations. Founded in 2020, we're on a mission to transform the energy landscape with safe, factory-built microreactors, leveraging cutting-edge software engineering. With our first reactor set to be tested at Idaho National Laboratory next year and initial customer deliveries projected for 2028, now is an exciting time to join our team.Role OverviewAs a Senior Power Electronics Engineer, you will be integral to the design and development of power electronics for our nuclear-powered high-speed generator. Your expertise will be crucial in the creation of high-voltage and high-speed generator drives, DC-DC converters for high-voltage batteries, and inverters for both standalone and grid-tied applications. Collaborating with a dynamic team, you will be responsible for the complete power electronics design, analysis, simulation, and component selection. You will work alongside leading industry engineers and engage with vendors and governmental organizations, playing a key role in bringing our groundbreaking nuclear microreactor to market.Key ResponsibilitiesDesign power electronic systems to convert AC and DC power into stable, grid-compatible voltages and frequencies.Take ownership of configuring active rectifiers, inverters, and DC-DC converters.Implement EMI/EMC strategies in system design, including line filter selection, capacitors, grounding, and isolation.Apply your expertise in designing and validating gate drivers, power stages, magnetics, and control systems.Conduct modeling and detailed simulation of inverters.Lead the design and construction of fully functional inverters independently.Perform formal circuit analysis, including de-rating and worst-case scenario evaluations.Optimize for loss, efficiency, and conduct thermal analysis of the inverters.

Senior Mechanical Engineer - Fluid SystemsRadiant Industries is on the lookout for an enthusiastic and experienced Senior Mechanical Engineer specializing in Fluid Systems. This pivotal role involves overseeing the design and development of critical Kaleidos fluid systems, guiding projects from initial design to production. These systems are essential for converting reactor core heat into electrical power.As a key member of our engineering team, you'll engage in trade studies, component selection, thermal hydraulic analysis, piping design, vendor evaluation, assembly, and rigorous testing. Your contributions will play a vital role in launching the first new commercial reactor design in over 50 years by 2026.Responsibilities:Lead the engineering process for fluid systems and components, including compressors, valves, and heat exchangers.Conduct complex thermal and fluid analyses to inform design choices, validate system performance, and maintain structural integrity using hand calculations and finite element analysis tools.Perform trade studies to enhance system performance and fulfill program requirements.Create and implement manufacturing and assembly instructions along with test plans.Manage and maintain a comprehensive Bill of Materials (BOM).Identify and cultivate relationships with suppliers for all components.Oversee the design, manufacturing, and testing schedules for subassemblies.Conduct risk analysis (FMEA) for subsystems.Gather requirements and provide guidance and constructive feedback to engineers across various disciplines.Qualifications:Bachelor’s degree in Mechanical, Materials, Aeronautical, Civil, or Structural Engineering from an accredited institution.Proven experience in fluid system architecture design.A minimum of 4 years of experience in designing, building, and testing fluid systems.In-depth knowledge of fluid dynamics and thermodynamics.Solid understanding of heat exchanger design and analysis techniques.