Senior Guidance, Navigation, and Controls Engineer

About VardaLow Earth orbit is open for business. Varda is pioneering the creation of commercial space infrastructure, ranging from in-orbit pharmaceutical manufacturing to efficient reentry capsules.Our innovative approach aims to manufacture products in space that can significantly enhance life on Earth, from critical pharmaceuticals to advanced fibers. Varda is at the forefront of transforming the orbital economy through the development of both the necessary products and infrastructure. Our mission is to broaden the economic horizons of humanity.Our exceptional team, consisting of veterans from SpaceX, Blue Origin, leading pharmaceutical firms, and Silicon Valley, is well-equipped to achieve this vision. Founded in January 2021 by Will Bruey and Delian Asparouhov, Varda has garnered substantial investment from notable investors including Khosla Ventures, Lux Capital, Founders Fund, Caffeinated Capital, General Catalyst, and Also Capital.With our headquarters in El Segundo, California, we have a dedicated office and production facility where we design, integrate, and test our vehicles and technologies. Additional offices are located in Washington, DC, and Huntsville, AL.Join Varda to contribute to the establishment of a vibrant in-space economy.

Join vardaspace as a Guidance, Navigation & Controls (GNC) Intern for the Fall 2026 semester! This is a unique opportunity to immerse yourself in the aerospace industry, working alongside seasoned professionals on cutting-edge projects that shape the future of space exploration. You will gain hands-on experience, contribute to innovative solutions, and develop your skills in a collaborative environment.

About RadiantRadiant, located in El Segundo, CA, is an innovative startup 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 and extended operation, capable of providing power for up to five years without refueling. This revolutionary approach to portable nuclear energy aims to replace traditional diesel generators, delivering essential support for hospitals, data centers, remote locations, and military installations. Founded in 2020, Radiant is poised to test its inaugural reactor at the Idaho National Laboratory in the coming year, with initial customer deployments anticipated to begin in 2028.Position OverviewRadiant is searching for a Senior Advanced Controls Systems Engineer to take the lead in designing, implementing, and validating autonomous control systems for our nuclear microreactors. You will manage the entire control system development process—from defining requirements to operational deployment. Responsibilities include algorithm development, modeling and simulation, embedded implementation, and system validation.This role involves the design and integration of tightly coupled control functions that encompass reactivity control, primary loop mass flow, alternator/generator speed, and coordination across multiple reactors within microgrids. The ideal candidate will possess experience working in regulatory environments, developing autonomous and adaptive control strategies, and conducting system-level analyses of nonlinear, coupled dynamic systems. Close collaboration with multidisciplinary engineering teams focused on hardware, software, and system integration is essential.

Senior Automation & Controls EngineerJoin Radiant Industries as a Senior Automation and Controls Engineer, where your expertise will be instrumental in collaborating with our design and manufacturing teams. You will be responsible for the design, construction, and implementation of automated production and testing equipment crucial for the mass production and refueling of our innovative microreactor technology.Key Responsibilities:Lead the design, development, and execution of automation projects, including ideation of equipment, machine commissioning, and conducting quality and reliability studies before transitioning projects to operational teams.Develop, write, and troubleshoot PLC code focused on creating organized, structured, and maintainable code suitable for high-volume manufacturing environments.Ensure factory safety and reliability by implementing ANSI/RIA R15.06 and OSHA compliant systems for robots, gantries, conveyors, and other manufacturing equipment.Design electrical systems that adhere to NEC, NFPA, and UL508A standards.Select and size electrical and electromechanical components, including servo motors and controllers.Oversee the assembly of electrical cabinets, field wiring, as well as pneumatic and fluid plumbing.Create user-friendly HMI screens that simplify the operation and troubleshooting of complex machinery.Required Qualifications:Bachelor’s degree in Engineering, Physics, or Computer Science from an accredited institution.A minimum of 4 years of experience in designing and commissioning automation and controls systems for industrial applications.Preferred Qualifications:Master’s degree in an engineering discipline.Experience in process integration and electromechanical/mechatronic systems.Familiarity with various robotic welding applications (Kuka, ABB & Fanuc).Proficiency in robot and PLC simulation.Experience with electrical schematic CAD software such as Zuken E3.Knowledge of programming languages such as C#, .NET, Python, and/or SQL.Experience in PLC programming, preferably with Beckhoff TwinCat 3.

About Radiant IndustriesRadiant Industries, based in El Segundo, CA, is pioneering the development of the world's first mass-produced, portable nuclear microreactors. Our flagship product, Kaleidos, is a 1-megawatt, fail-safe microreactor designed for mobility and operational longevity, capable of running for up to five years without refueling. This groundbreaking technology is set to replace diesel generators in various critical applications, including hospitals, data centers, remote locations, and military bases. Our innovative approach integrates modern software engineering with nuclear development to deliver safe, factory-produced microreactors using proven materials. Founded in 2020, Radiant is preparing to test its inaugural reactor at the Idaho National Laboratory next year, with customer deliveries commencing in 2028.Position Overview: Control Systems Test EngineerWe are looking for a driven and meticulous Control Systems Test Engineer to join our dynamic team. In this crucial role, you will take charge of developing, maintaining, executing, and automating comprehensive test cases throughout the testing lifecycle for our reactor control systems. You will work collaboratively with systems engineers, controls developers, and software teams to uphold the highest standards of quality and reliability in our safety-critical control software.Key ResponsibilitiesAnalyze and assess control system Simulink models and related design documents to gain insights into system behavior and expected performance.Interpret system requirements for the reactor control system to establish thorough test coverage.Create and manage detailed test artifacts, including:Unit test casesSoftware-in-the-Loop (SiL) test casesHardware-in-the-Loop (HiL) test casesHardware test casesConduct all testing phases:Unit testingSiL testingHiL testingFull hardware testingAutomate testing workflows for SiL, HiL, and hardware test cases utilizing scripting languages such as Python or Go (Golang).Organize and oversee structured test campaigns, including regression suites.

Join Vardaspace as a Thermal Hardware Engineer specializing in Passive & Active Control Systems. In this role, you will be at the forefront of innovative thermal management solutions, ensuring the efficiency and reliability of our cutting-edge technologies. Collaborate with a dynamic team to design, develop, and test thermal hardware components that meet rigorous performance standards.

ghj seeks a Controller to join the team in El Segundo, CA. This role leads financial operations, manages reporting, and provides direction within the finance department. The Controller plays a central part in maintaining internal controls and ensuring accounting standards are met. What you will do Lead and supervise a team of finance professionals Oversee the preparation of financial statements and reports Maintain and monitor internal controls Ensure compliance with applicable accounting standards Provide strategic financial guidance to support company goals Location This position is based in El Segundo, CA.

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.

Join VardaSpace as a Senior Structures Engineer and be at the forefront of innovative aerospace solutions. In this pivotal role, you will lead the design and analysis of structural components for space vehicles, ensuring safety and performance in the demanding environment of space. You will collaborate with a passionate team of engineers and contribute to groundbreaking projects that push the boundaries of technology.

At Sift, we are pioneering the future of infrastructure for modern machines, transforming the way they are constructed, tested, and managed. Our innovative platform offers engineers unparalleled real-time observability over high-frequency telemetry, effectively eliminating bottlenecks and facilitating rapid, dependable development.Originating from our groundbreaking work at SpaceX on projects like Dragon, Falcon, Starlink, and Starship, Sift emerged from the need for advanced infrastructure to accommodate complex telemetry, debug flight systems, and ensure mission reliability. Our founding team, with expertise from SpaceX, Google, and Palantir, crafts solutions for mission-critical systems where precision and scalability are paramount.As a pivotal member of our engineering team, you will not only write code but also play a significant role in shaping the architecture, product direction, and culture of a company dedicated to addressing real engineering challenges. If you thrive on tackling intricate technical problems and aspire to build foundational systems that support complex machinery, we encourage you to apply.

Join Radiant Industries as a Senior Thermal Engineer, where you will play a crucial role in developing innovative thermal solutions for our cutting-edge projects. You will collaborate with a dynamic team of engineers and scientists to enhance product performance through advanced thermal management techniques.

Mattel, Inc. seeks a Senior Quality Engineer based in El Segundo. This role centers on upholding and improving quality standards across several product lines. The position plays a key part in ensuring that products meet expectations from development through production. Key responsibilities Use quality assurance methods and tools to enhance processes Monitor product quality at every stage, from development to production Collaborate with teams to ensure products are reliable and meet quality goals This role focuses on both maintaining current standards and identifying opportunities to raise the bar for product quality at Mattel.

About Matter IntelligenceMatter Intelligence is at the forefront of developing cutting-edge airborne and spaceborne sensing systems that integrate precision optics, innovative thermal architectures, spacecraft engineering, and AI-enhanced data analysis. Our advanced systems function effectively in challenging orbital and airborne environments, unlocking new possibilities for Earth observation capabilities.With a proven track record of delivering technologies to Mars for NASA/JPL, designing advanced sensors for U.S. defense, and establishing core infrastructure at OpenAI, our team is now focused on creating the next generation of sensing systems for both space and airborne applications.About the RoleWe are looking for a Senior Thermal Engineer who will take charge of the thermal architecture, analysis, and verification of our precision optical payloads and spacecraft systems. This role encompasses ownership of thermal performance from the initial concept stage through integration, testing, and, where applicable, on-orbit operations.You will be responsible for developing and maintaining intricate thermal models, steering thermal trade studies, supporting STOP performance, and collaborating closely with systems, optomechanical, electronics, and AI & T teams to ensure that flight hardware meets all performance requirements throughout every mission phase.This is a hands-on, analytical, and leadership-focused role suited for an engineer seeking significant technical ownership over hardware that operates in flight.Key ResponsibilitiesThermal Architecture & DesignDefine and lead the thermal architecture for optical payloads and spacecraft subsystems.Design both passive and active thermal control solutions, including radiators, heat pipes, thermal straps, insulation, and cryogenic interfaces.Translate mission-level thermal requirements into subsystem- and component-level designs.Support thermal trades to effectively balance performance, mass, power, and complexity.Thermal Modeling & AnalysisDevelop, maintain, and correlate detailed thermal models using industry-standard tools (e.g., Thermal Desktop, SINDA/FLUINT).Conduct steady-state and transient thermal analyses across all mission phases (launch, ascent, on-orbit hot/cold cases, safe modes).Perform in-depth thermal analysis of precision optical elements (mirrors, mounts, focal plane assemblies), including thermo-elastic distortion.Execute thermal assessments at the circuit card and chassis level.

Senior Materials Engineer (Metallurgy)Join Radiant Industries as a dynamic Senior Materials Engineer, where you'll be responsible for the testing and qualification of materials, particularly metals, for our innovative Kaleidos 1MW nuclear microreactor. We’re looking for an individual who takes pride in their work, is highly skilled in materials selection, testing, and analysis, and thrives in a fast-paced, collaborative environment. You will play a crucial role in ushering in the era of the world's first mass-produced, rapidly-deployable nuclear reactor.Responsibilities & DutiesPlan and execute comprehensive materials testing to derive essential material properties for informed design decisions.Spearhead the qualification of all metallic components utilized in the design of the Kaleidos reactor.Conduct rapid prototypic testing to mitigate risks associated with design and integration.Collaborate closely with the manufacturing team to develop and validate application-specific manufacturing processes including welding, brazing, coating, casting, and heat treatments.Provide expert advice on materials selection for various components within the Kaleidos project.Identify and manage equipment necessary for materials characterization and testing.Assess and ensure the quality and accuracy of material property data for our materials database.Define and enhance manufacturing processes to achieve the desired material properties.Required Qualifications & SkillsBachelor’s degree from an accredited institution in Materials Science and Engineering, or Mechanical, Aeronautical, Nuclear, or Chemical Engineering with a focus on materials science.5+ years of experience in the development, testing, and analysis of materials for challenging load scenarios and environments.Desired Qualifications & SkillsMaster’s or PhD degree in a related field is preferred.

Join Mattel, Inc. as the Senior Manager of Quality Engineering, where you will play a pivotal role in ensuring the highest standards of quality in our innovative products. In this dynamic position, you will lead and mentor a team of skilled engineers, driving quality initiatives that align with our commitment to excellence. Your expertise will directly contribute to enhancing product performance, reliability, and safety, making a meaningful impact on the lives of children and families around the world.

Senior Nuclear EngineerJoin Radiant Industries as a Senior Nuclear Engineer! In this pivotal role, you will take the lead on modeling techniques and reactor physics calculations that drive neutronics parameters such as reactivity, kinetics parameters, and energy deposition distributions. These calculations are integral to our innovative Digital Twin simulation software. Your expertise will ensure the safety and reliability of our modeling methods, which are crucial for the commercialization of the first mass-produced nuclear reactor.Key Responsibilities:Lead the development of core neutronics models and reactor physics calculations, essential for Radiant’s transient safety analyses.Execute calculations of energy deposition distributions, reactivity coefficients, kinetics parameters, and control blade worths for integration into Digital Twin models.Verify modeling assumptions and evaluate the conservatism of neutronics models.Document methodologies for both technical and non-technical stakeholders.Support Verification & Validation (V&V) initiatives for the Digital Twin.Collaborate with teams across the company on reactor physics, shielding, and radiation detection analyses.Qualifications:Bachelor’s degree in Nuclear Engineering or a related discipline from an accredited institution.A minimum of 4 years of experience with Monte Carlo nuclear engineering software such as OpenMC, MCNP, Serpent, SCALE, etc.Proven ability to document analysis methods and assumptions effectively.Strong programming skills in any language, with a preference for Python.Preferred Qualifications:Familiarity with reactor kinetics.Basic understanding of thermal hydraulic principles.Experience in communicating complex information to cross-functional teams.Self-motivated with a strong sense of ownership for project outcomes.

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.

About VardaLow Earth orbit is open for business. Varda is pioneering the advancement of commercial space infrastructure, from in-orbit pharmaceutical processing to dependable and cost-effective reentry capsules.From life-saving pharmaceuticals to enhanced fiber optics, a myriad of products utilized on Earth today can only be produced in space. Varda is driving innovation in the orbital economy by establishing both the products and infrastructure required for space to directly enhance life on Earth. Our mission is to expand the economic horizons of humanity.Our team is exceptionally equipped to achieve this objective, with leadership and personnel comprising veterans from SpaceX, Blue Origin, leading pharmaceutical companies, and Silicon Valley. 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.Varda's headquarters is located in El Segundo, California, where we operate offices and a production facility for building, integrating, and testing our vehicles, equipment, and materials. Additionally, Varda has offices in Washington, DC, and Huntsville, AL.Join Varda and contribute to the creation of a thriving in-space ecosystem.

We are seeking a highly skilled and experienced Senior Thermal-Hydraulics Engineer to join our dynamic team at Radiant Industries. In this role, you will be responsible for designing, analyzing, and optimizing thermal-hydraulic systems to enhance our product offerings. Your expertise will play a crucial role in ensuring the efficiency and reliability of our engineering solutions.As a key member of our team, you will collaborate with cross-functional teams to develop innovative designs, conduct simulations, and perform experiments. If you are passionate about engineering and eager to take on new challenges, we invite you to apply!

Radiant Industries is actively seeking a skilled Quality Control Manager to spearhead dimensional inspection, in-process production inspection, and metrology operations across a wide range of hardware, including mechanical, structural, electrical, and power-generation systems. This pivotal role will focus on the establishment and maintenance of comprehensive inspection systems that guarantee all hardware meets design specifications, internal standards, and quality requirements from the moment of receipt through to final assembly.This position is ideal for a proactive leader who thrives in a dynamic hardware setting and is passionate about developing structured processes while upholding a high level of technical precision.