Senior Mechanical Engineer - Fluid Systems

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.

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 pivotal role in transforming reactor core heat into electrical power. Your expertise will be crucial in shaping the future of commercial reactor design, aiming for the first new design in over 50 years by 2026.Key Responsibilities:Lead the engineering of fluid systems and components, such as compressors, valves, and heat exchangers.Conduct advanced thermal and fluid analysis to inform design choices, validate system performance, and maintain structural integrity through first-principle calculations and finite element analysis.Perform trade studies to enhance system efficiency and meet project specifications.Create and implement manufacturing/assembly instructions and testing protocols.Develop and maintain a comprehensive Bill of Materials (BOM).Source and cultivate relationships with suppliers for all components.Oversee design, manufacturing, and testing schedules for subassemblies.Conduct risk assessments (FMEA) for subsystems.Gather requirements and provide constructive feedback to cross-functional engineering teams through effective communication.

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.

About VardaLow Earth orbit is open for business. Varda is pioneering the construction of commercial space infrastructure, ranging from in-orbit pharmaceutical manufacturing to efficient reentry capsules.With a commitment to innovation in the orbital economy, Varda is dedicated to developing products and infrastructure that will enable space to directly enhance life on Earth. Our mission revolves around expanding humanity's economic horizons.Our exceptional team, featuring industry veterans from SpaceX, Blue Origin, major pharmaceutical entities, and Silicon Valley, is poised to achieve this ambitious goal. Founded in January 2021 by Will Bruey and Delian Asparouhov, Varda enjoys substantial backing from renowned investors including Khosla Ventures, Lux Capital, Founders Fund, Caffeinated Capital, General Catalyst, and Also Capital.Headquartered in El Segundo, California, Varda operates offices and a production facility where our vehicles, equipment, and materials are designed, built, and tested. We also maintain offices in Washington, DC and Huntsville, AL.Join Varda and contribute to the creation of a thriving in-space ecosystem.

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 Mechanisms EngineerRadiant Industries is on the lookout for a dynamic and experienced Senior Mechanisms Engineer to spearhead the design and development of essential mechanisms within the innovative Kaleidos project. In this role, you will tackle unique engineering challenges to create efficient and dependable mechanisms that govern reactivity and activate critical safety features. Your responsibilities will encompass trade studies, material selection, in-depth structural analysis, assembly, integration, and rigorous testing. Your contributions will be vital in propelling the introduction of the first new commercial reactor design in over five decades by the year 2026.Key Responsibilities:Lead the design and development of crucial mechanisms such as control blade actuators and air jacket valves.Conduct comprehensive trade studies and formulate designs that align with program requirements.Execute detailed thermomechanical analysis (including static strength and durability/fatigue) and kinematic analysis to assess structural integrity and performance margins using both hand calculations and finite element analysis tools.Develop and implement manufacturing and assembly instructions along with test plans.Create and oversee a Bill of Materials (BOM).Identify and cultivate relationships with suppliers for necessary components.Manage schedules for subassembly design, manufacturing, and testing.Conduct risk analysis (FMEA) for subsystems.Gather requirements and provide insights to engineers across other functional areas through effective communication.Qualifications:Bachelor's degree in Mechanical or Aeronautical Engineering from an accredited institution.A minimum of 4 years of experience in mechanism design.Over 4 years of experience conducting stress analysis utilizing both hand calculations and finite element tools (such as Abaqus, Ansys, FEMAP, or equivalent).Desired Skills:Proficient in the design of multi-component assemblies using CAD software (NX or similar).Experience in designing hardware that underwent manufacturing, deployment, and iterative improvements.Familiarity with pneumatic system design.Knowledge in integrating electromechanical components such as motors or encoders.

Role Overview Varda Space Industries is hiring a Senior Mechanisms Engineer focused on payload systems in El Segundo, California. This role leads the design, development, and testing of mechanisms that enable advanced payloads for space applications. What You Will Do Design, develop, and test mechanisms that support complex payloads Work closely with multidisciplinary teams to integrate mechanical systems Help ensure payload mechanisms meet quality and performance requirements

About VardaPioneering the Commercial Space Frontier. Varda is at the forefront of developing commercial space infrastructure, ranging from in-orbit pharmaceutical manufacturing to cost-effective reentry capsules.With innovative products such as life-saving pharmaceuticals and advanced fiber optics, Varda is reshaping the orbital economy to yield tangible benefits for life on Earth. Our mission is to push the limits of humanity's economic potential through space.Our talented team is composed of experts from SpaceX, Blue Origin, leading pharmaceutical firms, and Silicon Valley, all driven by the vision of founders Will Bruey and Delian Asparouhov since January 2021. We are supported by prestigious investors including Khosla Ventures, Lux Capital, Founders Fund, and General Catalyst.Headquartered in El Segundo, California, our production facility is where we design, build, and test our vehicles, equipment, and materials. We also have offices in Washington, DC and Huntsville, AL.Join us at Varda to help create a thriving ecosystem in space.About This RoleAs a Mechanisms Engineer on Varda’s Payload team, you will design and develop advanced electromechanical flight hardware that operates in the harsh conditions of orbit, withstands hypersonic reentry, and returns to Earth for assessment and refinement. You will take complete ownership of payloads for both pharmaceutical production and hypersonic reentry testing, guiding projects from concept through assembly, testing, launch, and recovery.

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.

Rainmaker creates cloud seeding technology aimed at improving water availability and addressing difficult weather patterns. The company’s work brings together radar validation, unmanned aerial systems (UAS), numerical weather modeling, and environmentally mindful seeding materials to help increase precipitation. The engineering team focuses on advancing UAS platforms, developing dispersion payloads, and building both in-situ and remote sensing systems. Projects move quickly and are designed for practical, real-world results. Role overview This Research Engineer in Aerosol & Spray Systems role is suited for those with a background in mechanical or aerospace engineering, especially with expertise in aerosol science, multiphase flow, and compressible fluid dynamics. The position sits at the intersection of cloud physics and advanced fluid systems. Work centers on designing hardware that applies high-velocity gas dynamics to break up nanoparticle agglomerates and atomize liquid precursors into submicron aerosols. Key challenges Efficient dispersion of cohesive dry powders and ultra-fine droplets Managing complex mass transfer and the momentum of particles or droplets Solving mechanical problems while meeting strict aerospace Size, Weight, and Power (SWaP) constraints Location This role is based in El Segundo, CA.

About VardaLow Earth orbit is open for business. Varda is pioneering the development of commercial space infrastructure, ranging from in-orbit pharmaceutical processing to economical reentry capsules.From critical pharmaceuticals to advanced fiber optics, numerous products essential on Earth can only be produced in the unique environment of space. Varda is at the forefront of innovation in the orbital economy, establishing both the products and infrastructure necessary for space to significantly benefit life on Earth. Our mission is to expand the economic frontiers of humanity.Our team is exceptionally equipped to achieve this ambition, comprising veterans from SpaceX, Blue Origin, leading pharmaceutical firms, and Silicon Valley. Varda was founded in January 2021 by Will Bruey and Delian Asparouhov, backed by prominent investors including Khosla Ventures, Lux Capital, Founders Fund, Caffeinated Capital, General Catalyst, and Also Capital.With headquarters in El Segundo, California, Varda operates offices and a production facility where our vehicles, equipment, and materials are designed, integrated, and tested, and we also maintain offices in Washington, DC, and Huntsville, AL.Join Varda and be part of creating a thriving in-space ecosystem.

About VardaLow Earth orbit is open for business. Varda is at the forefront of developing commercial space infrastructure, ranging from in-orbit pharmaceutical manufacturing to cost-effective reentry capsules.With the potential to create life-saving pharmaceuticals and advanced fiber optics, Varda is pioneering innovations that will enable the orbital economy to directly enhance life on Earth. Our mission is to expand the economic frontiers of humanity.Our team is composed of industry veterans from SpaceX, Blue Origin, leading pharmaceutical firms, and Silicon Valley. Founded in January 2021 by Will Bruey and Delian Asparouhov, Varda has garnered support from distinguished investors including Khosla Ventures, Lux Capital, Founders Fund, Caffeinated Capital, General Catalyst, and Also Capital.Headquartered in El Segundo, California, we operate from our offices and production facility where our vehicles, equipment, and materials are designed, integrated, and tested. We also have locations in Washington, DC and Huntsville, AL.Join Varda to help create a thriving in-space ecosystem.About This RoleVarda is on the lookout for a Senior Systems Engineer, Flight Safety to act as the lead architect for mission safety and reentry compliance. As part of our Mission Assurance team, you will spearhead the development of Flight Safety Analysis and the regulatory strategy essential for FAA Part 450 and Range Safety licensing. This is a highly collaborative position that connects various functions across the organization.

Radiant Industries is on the lookout for an experienced and passionate Senior Mechanical Engineer specializing in sheet metal structures. In this pivotal role, you will be instrumental in designing and developing essential structures within our innovative Kaleidos project. Your expertise will address unique challenges while creating efficient and reliable structures capable of facilitating fission in extreme temperature environments and adhering to strict volumetric constraints.As a Senior Mechanical Engineer, you will lead trade studies, select materials, and conduct detailed structural analyses, including assembly, integration, and testing. Your contributions will significantly impact the development of the first new commercial reactor design in over 50 years, scheduled for completion by 2026.

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.

With over 50 years of experience, ENSCO Inc. has been at the forefront of delivering innovative engineering, science, and advanced technology solutions to government and private sectors globally.We take pride in our ability to create and implement cutting-edge technologies that ensure mission success. Our services encompass systems engineering, integration, and advanced technologies that enhance the safety, security, and resilience of critical missions across various domains, including ground, air, space, and information systems.Discover more about ENSCO.Position DescriptionWe are currently looking for a Senior Evolved Strategic Systems (ESS) Program Systems Integration Engineer to join our dynamic Systems Engineering team. This team is responsible for shaping the future of space communication systems that support the Air Force Military Satellite Communications. The successful candidate will engage in Systems Engineering & Integration (SE&I) activities within a multidisciplinary and collaborative framework. You will be expected to collaborate with SE&I team members, contractors, government personnel, and members of the USAF. This role includes leading and supporting multiple working groups to facilitate technical discussions, identify and mitigate risks, address requirement gaps, create briefings, track action items, and document meeting minutes.The MILSATCOM Systems Engineering, Integration, and Test (MSEIT) initiative offers advanced SE&I capabilities for the Air Force’s Space and Missiles System Center. We play a crucial role in the acquisition of state-of-the-art Military Satellite Communications systems, ensuring secure, survivable, and protected communications for our nation’s military personnel. We are seeking technically adept individuals who can thrive in a highly collaborative small team environment, utilizing the latest tools and methodologies to overcome the complexities of integrating sophisticated space and ground communication systems. This position is based on-site in El Segundo, CA. Key responsibilities include but are not limited to:Developing and executing integration strategies and processes to ensure the successful integration of satellite communication systems, segments (Ground, Space, Crypto, Terminals), subsystems, elements, and components; managing the technical baselines among various stakeholders.Conducting thorough analyses of system requirements that define the technical frameworks necessary for successful project execution.

About VardaLow Earth orbit is open for business. Varda is pioneering the advancement of commercial space infrastructure, from in-orbit pharmaceutical production to efficient and reliable reentry capsules.With products ranging from life-saving pharmaceuticals to advanced fiber optics, Varda is at the forefront of innovation in the orbital economy, creating the necessary products and infrastructure to ensure that space advancements directly benefit life on Earth. Our mission is to push the economic limits of humanity.Our team is exceptionally equipped to achieve this mission, featuring leadership and staff with backgrounds from SpaceX, Blue Origin, major pharmaceutical firms, and Silicon Valley. Founded in January 2021 by Will Bruey and Delian Asparouhov, Varda has received significant support from top-tier 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 where our vehicles, equipment, and materials are designed, integrated, and tested. We also have offices located in Washington, DC, and Huntsville, AL.Join Varda and contribute to the creation of a thriving in-space ecosystem.About This RoleVarda Space Industries is on the lookout for a Senior Propulsion Engineer to oversee ground propulsion fluid systems for our spacecraft. This role entails taking full responsibility for the architecture, design, and functionality of fluid systems that facilitate spacecraft fueling, testing, and launch preparations. Your expertise will be crucial in ensuring the reliability and performance of systems vital to mission success.

About VardaLow Earth orbit is open for business. Varda is at the forefront of developing commercial space infrastructure, ranging from in-orbit pharmaceutical processing to cutting-edge, economical reentry capsules.We are pioneering innovations in the orbital economy by creating products and infrastructure that enable space to tangibly enrich life on Earth. Our mission is to expand the economic horizons of humanity.Our exceptional team, composed of veterans from SpaceX, Blue Origin, leading pharmaceutical companies, and Silicon Valley, is uniquely equipped to achieve this vision. Founded in January 2021 by Will Bruey and Delian Asparouhov, Varda is supported by esteemed investors including Khosla Ventures, Lux Capital, Founders Fund, Caffeinated Capital, General Catalyst, and Also Capital.Headquartered in El Segundo, California, Varda boasts offices and a production facility dedicated to the construction, integration, and testing of our vehicles, equipment, and materials. We also have locations in Washington, DC and Huntsville, AL.Join Varda and be part of shaping a thriving ecosystem in space.

About Matter IntelligenceAt Matter Intelligence, we are pioneering the future of vision AI with a revolutionary sensor that can perceive molecular chemistry, temperature, and 3D shapes, all integrated into a Large World Model. This innovative system doesn't merely capture images; it comprehensively understands information from a single pixel, which we proudly term as Superintelligent Vision.Join a team of experts who have successfully delivered advanced technologies to Mars for NASA/JPL, co-founded and led infrastructure for OpenAI, developed cutting-edge sensors for U.S. Defense, and created foundational algorithms for spectral and 3D imaging. Together, we are constructing the next generation of infrastructure for vision and intelligence in our physical world.About the RoleWe are on the lookout for a skilled Senior Systems Engineer to take ownership of the end-to-end technical architecture, integration, and mission assurance for a complete remote-sensing space system. In this role, you will act as the technical authority, ensuring that all mission components—from payload and spacecraft to launch, ground operations, and beyond—are cohesively aligned to provide transformative Earth-observation capabilities.Your responsibilities will encompass leading mission systems engineering, orchestrating subsystem integration, maintaining the technical baseline, driving critical design and verification decisions, and guiding the engineering team throughout the entire lifecycle. Your contributions will significantly impact mission feasibility, performance, and long-term operational success.

Radiant Industries is seeking a Mechanical Engineer focused on electric motor design to join the team developing an advanced alternator for a nuclear-driven, high-speed power generation system. This entry-level position is designed for recent graduates who want hands-on experience with high-voltage electric motors and generators. The role is fully on-site at the El Segundo, CA headquarters. What you will do Design and analyze generator components used in high-speed power systems. Create detailed 3D models and 2D fabrication drawings using CAD and NX software. Collaborate with cross-functional engineering teams, including turbomachinery specialists, to develop systems that convert mechanical energy to electrical energy. Communicate with vendors to source parts for generator construction. Carry out bench, dynamic, and system testing on subsystem components and models. Participate in hands-on assembly, rapid prototyping, and integration of electric motors and generators. Support efforts to commercialize mass-produced nuclear reactors that deliver clean energy to remote locations and essential infrastructure. Requirements Bachelor's degree in Mechanical Engineering with a focus on electric motors. Solid understanding of permanent magnet electric motors. Practical experience in electric motor design, manufacturing, and assembly processes. Preferred qualifications Master's degree in Mechanical Engineering specializing in electric motors. Knowledge of motor control systems, including Space Vector Modulation (SVM). Experience working with teams in turbomachinery, power electronics, thermal, packaging, or software engineering. Additional requirements Willingness to work extended hours and weekends as needed. This position requires 100% on-site presence in El Segundo, CA.

Varda Space Industries builds commercial space infrastructure, including in-orbit pharmaceutical manufacturing and reentry capsules designed for cost efficiency. The company specializes in products enabled by microgravity, such as advanced fiber optics and pharmaceuticals, aiming to bring the benefits of space manufacturing to people on Earth. Founded in 2021 by Will Bruey and Delian Asparouhov, Varda’s team draws on backgrounds from SpaceX, Blue Origin, major pharmaceutical firms, and Silicon Valley. The company is supported by Khosla Ventures, Lux Capital, and Founders Fund. Headquarters and production are based in El Segundo, California, with offices in Washington, DC, and Huntsville, Alabama. Role overview The Lead Principal Mechanisms Engineer for Payloads leads the design and development of complex electromechanical flight hardware. This hardware must operate reliably in orbit, withstand hypersonic reentry, and return to Earth for further analysis and development. This position shapes the payload architecture for missions focused on pharmaceutical manufacturing and hypersonic reentry testbeds. The engineer guides projects from initial concept through detailed design, ensuring mission requirements are met throughout each stage.