K2 Space
Acton, California
Job Description Job Description K2 is building the largest and highest-power satellites ever flown, unlocking performance levels previously out of reach across every orbit. Backed by over $1 billion in total funding from leading investors including Altimeter Capital, ICONIQ, Kleiner Perkins, Lightspeed Venture Partners, Redpoint Ventures, and T. Rowe Price - and with over $1 billion in signed contracts across commercial and US government customers, we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space. The rise of heavy-lift launch vehicles is shifting the industry from an era of mass constraint to one of mass abundance, and we believe this new era demands a fundamentally different class of spacecraft. Engineered to survive the harshest radiation environments and to fully capitalize on today's and tomorrow's massive rockets, K2 satellites deliver unmatched capability at constellation scale and across multiple orbits. With multiple launches in 2027 and plans to scale to 100 satellites a year, we're Building Bigger - helping develop the solar system and build toward a Kardashev Type II (K2) civilization. If you are a motivated individual who thrives in a fast-paced environment and you're excited about contributing to the success of a high-growth Series D-funded company, we'd love for you to apply. The Role Critical to achieving K2's vision is deploying our 20-kW high-power spacecraft platform at scale across MEO, GEO, cis-lunar, and deep space. Realizing that vision means actively controlling the heat generated by the high-power payloads our platform hosts. This requires active thermal control systems such as pumped fluid loops, built from fluid turbomachinery, valves, accumulators, and pressure and temperature instrumentation. Scaling to constellations requires someone who can span the mechanical, fluid, electromechanical, and thermal-fluid domains and collaborate closely with the thermal, avionics, software, and production teams to deliver these systems at rate. As Principal Turbomachinery Engineer, you will define how K2 designs, analyzes, manufactures, tests, integrates, and deploys precision turbomachinery for integration into active thermal control systems. You will own these unique pieces of turbomachinery from concept through integration and rate production. You will be responsible for mission-critical hardware which goes to space. Responsibilities Responsible for turbomachinery mechanisms in the spacecraft active thermal control system, including: Architectural down-selection, design, and tolerancing Pump- and mechanism-specific analyses (rotor dynamics, bearings and seals, hydraulic performance, structural, thermal-fluid) Environmental test and qualification plans Ground- and in-flight performance validation plans Supply chain and high-volume manufacturing trades Partner with the thermal and platform architecture teams to scope the long-term K2 pumped-fluid-loop roadmap, and system performance requirements Collaborate with thermal, structures, avionics, and satellite bus teams to determine optimal operations and requirements for the pump, supporting mechanisms, and broader fluid loop Prepare design reviews to secure stakeholder buy-in and communicate expectations across hardware, software, test, and manufacturing teams Own and refine program deliverables and schedules throughout development and production Evaluate and select manufacturing equipment for specialty processes (impeller machining, rotating-assembly balancing, leak/flow test) Partner with production to develop work instructions, in-process checkouts, and end-of-line tests Qualifications Bachelor's degree in mechanical, aerospace, or other relevant engineering discipline 8+ years of experience with mechanical and/or electromechanical design and analysis 2+ years of experience design and analysis of turbomachinery in harsh environments Experience with CAD or FEA software packages Nice to Have Experience designing, building, and testing centrifugal or axial pumps for closed-loop thermal systems, including impeller geometry, volute/diffuser design, and hydraulic performance prediction Experience with NASA-STD-5017, SMC-S-016, and GSFC-STD-7000 for the design and qualification of in-space Moving Mechanism Assemblies Experience with bearing analysis, preload techniques, and preload measurement Experience with the practical application of GD&T Demonstrated ability to own moving mechanism assemblies across the full product lifecycle in a high velocity environment Demonstrated understanding of structural analysis and failure modes of complex mechanical systems in space environments and operations Independent and self-motivated mindset, with strong organizational, written, and oral communication skills across disciplines Compensation and Benefits: Base salary range for this role is $175,000 - $200,000 + equity in the company Salary and level will be based on several factors including, but not limited to: knowledge and skills, education, and experience level Comprehensive benefits package including paid time off, medical/dental/vision coverage, life insurance, paid parental leave, and many other perks If you don't meet 100% of the preferred skills and experience, we encourage you to still apply! Building a spacecraft unlike any other requires a team unlike any other and non-traditional career twists and turns are encouraged! If you need a reasonable accommodation as part of your application for employment or interviews with us, please let us know. Export Compliance As defined in the ITAR, "U.S. Persons" include U.S. citizens, lawful permanent residents (i.e., Green Card holders), and certain protected individuals (e.g., refugees/asylees, American Samoans). Please consult with a knowledgeable advisor if you are unsure whether you are a "U.S. Person." The person hired for this role will have access to information and items controlled by U.S. export control regulations, including the export control regulations outlined in the International Traffic in Arms Regulation (ITAR). The person hired for this role must therefore either be a "U.S. person" as defined by 22 C.F.R. 120.15 or otherwise eligible for a federally issued export control license. Equal Opportunity K2 Space is an Equal Opportunity Employer; employment with K2 Space is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.
Job Description Job Description K2 is building the largest and highest-power satellites ever flown, unlocking performance levels previously out of reach across every orbit. Backed by over $1 billion in total funding from leading investors including Altimeter Capital, ICONIQ, Kleiner Perkins, Lightspeed Venture Partners, Redpoint Ventures, and T. Rowe Price - and with over $1 billion in signed contracts across commercial and US government customers, we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space. The rise of heavy-lift launch vehicles is shifting the industry from an era of mass constraint to one of mass abundance, and we believe this new era demands a fundamentally different class of spacecraft. Engineered to survive the harshest radiation environments and to fully capitalize on today's and tomorrow's massive rockets, K2 satellites deliver unmatched capability at constellation scale and across multiple orbits. With multiple launches in 2027 and plans to scale to 100 satellites a year, we're Building Bigger - helping develop the solar system and build toward a Kardashev Type II (K2) civilization. If you are a motivated individual who thrives in a fast-paced environment and you're excited about contributing to the success of a high-growth Series D-funded company, we'd love for you to apply. The Role Critical to achieving K2's vision is deploying our 20-kW high-power spacecraft platform at scale across MEO, GEO, cis-lunar, and deep space. Realizing that vision means actively controlling the heat generated by the high-power payloads our platform hosts. This requires active thermal control systems such as pumped fluid loops, built from fluid turbomachinery, valves, accumulators, and pressure and temperature instrumentation. Scaling to constellations requires someone who can span the mechanical, fluid, electromechanical, and thermal-fluid domains and collaborate closely with the thermal, avionics, software, and production teams to deliver these systems at rate. As Principal Turbomachinery Engineer, you will define how K2 designs, analyzes, manufactures, tests, integrates, and deploys precision turbomachinery for integration into active thermal control systems. You will own these unique pieces of turbomachinery from concept through integration and rate production. You will be responsible for mission-critical hardware which goes to space. Responsibilities Responsible for turbomachinery mechanisms in the spacecraft active thermal control system, including: Architectural down-selection, design, and tolerancing Pump- and mechanism-specific analyses (rotor dynamics, bearings and seals, hydraulic performance, structural, thermal-fluid) Environmental test and qualification plans Ground- and in-flight performance validation plans Supply chain and high-volume manufacturing trades Partner with the thermal and platform architecture teams to scope the long-term K2 pumped-fluid-loop roadmap, and system performance requirements Collaborate with thermal, structures, avionics, and satellite bus teams to determine optimal operations and requirements for the pump, supporting mechanisms, and broader fluid loop Prepare design reviews to secure stakeholder buy-in and communicate expectations across hardware, software, test, and manufacturing teams Own and refine program deliverables and schedules throughout development and production Evaluate and select manufacturing equipment for specialty processes (impeller machining, rotating-assembly balancing, leak/flow test) Partner with production to develop work instructions, in-process checkouts, and end-of-line tests Qualifications Bachelor's degree in mechanical, aerospace, or other relevant engineering discipline 8+ years of experience with mechanical and/or electromechanical design and analysis 2+ years of experience design and analysis of turbomachinery in harsh environments Experience with CAD or FEA software packages Nice to Have Experience designing, building, and testing centrifugal or axial pumps for closed-loop thermal systems, including impeller geometry, volute/diffuser design, and hydraulic performance prediction Experience with NASA-STD-5017, SMC-S-016, and GSFC-STD-7000 for the design and qualification of in-space Moving Mechanism Assemblies Experience with bearing analysis, preload techniques, and preload measurement Experience with the practical application of GD&T Demonstrated ability to own moving mechanism assemblies across the full product lifecycle in a high velocity environment Demonstrated understanding of structural analysis and failure modes of complex mechanical systems in space environments and operations Independent and self-motivated mindset, with strong organizational, written, and oral communication skills across disciplines Compensation and Benefits: Base salary range for this role is $175,000 - $200,000 + equity in the company Salary and level will be based on several factors including, but not limited to: knowledge and skills, education, and experience level Comprehensive benefits package including paid time off, medical/dental/vision coverage, life insurance, paid parental leave, and many other perks If you don't meet 100% of the preferred skills and experience, we encourage you to still apply! Building a spacecraft unlike any other requires a team unlike any other and non-traditional career twists and turns are encouraged! If you need a reasonable accommodation as part of your application for employment or interviews with us, please let us know. Export Compliance As defined in the ITAR, "U.S. Persons" include U.S. citizens, lawful permanent residents (i.e., Green Card holders), and certain protected individuals (e.g., refugees/asylees, American Samoans). Please consult with a knowledgeable advisor if you are unsure whether you are a "U.S. Person." The person hired for this role will have access to information and items controlled by U.S. export control regulations, including the export control regulations outlined in the International Traffic in Arms Regulation (ITAR). The person hired for this role must therefore either be a "U.S. person" as defined by 22 C.F.R. 120.15 or otherwise eligible for a federally issued export control license. Equal Opportunity K2 Space is an Equal Opportunity Employer; employment with K2 Space is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.
Radiant Industries
El Segundo, California
Job Description Job Description About Radiant Radiant is an El Segundo, CA-based startup building the world's first mass-produced, portable nuclear microreactors. The company's first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant's unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Principal Turbomachinery Engineer to serve as the Responsible Engineer for the turbomachinery within our nuclear-driven power generation system. This role owns the mechanical design, integrity, and performance of the core rotating assembly at the heart of our 1MW closed-loop Brayton cycle. You will define and drive the mechanical architecture of high-speed rotating hardware operating at extreme temperatures, pressures, and rotational speeds. As a deeply technical individual contributor, you will set direction for rotor dynamics, structures, bearings, seals, and system integration while working closely with electrical, thermal, and manufacturing teams. This is a hands-on, high-ownership role focused on technical excellence, sound engineering judgment, and delivering reliable, production-ready turbomachinery. Responsibilities & Duties: Technical Ownership & System Architecture Serve as Responsible Engineer for the turbomachinery mechanical system. Own the mechanical architecture and design strategy for high-speed rotating assemblies (up to 30 krpm). Lead rotor dynamics, structural integrity, and life analysis for rotating components and assemblies. Define and flow down requirements from system-level constraints including thermal, structural, and operational environments. Make key technical decisions on rotor layout, shafting, bearings, seals, materials, and clearances. Ensure designs meet performance, reliability, safety, and regulatory requirements. Establish and uphold standards for mechanical design rigor, analysis quality, and documentation. Mechanical Design & Analysis Lead detailed design of turbomachinery components including rotors, shafts, housings, and support structures. Test and validate rotordynamic systems, driving model correlation, risk reduction, and performance verification. Perform and review structural and thermal analysis to ensure integrity under high-speed and high-temperature operation. Define tolerances, fits, stack-ups, and alignment strategies for precision rotating assemblies. Partner with electrical engineering on alternator rotor integration, including electromagnetic and structural coupling. Cross-Functional Integration Partner closely with turbomachinery aero, motor design, thermal, manufacturing, and test teams. Ensure seamless integration between turbine, compressor, and alternator subsystems. Drive clear interface definitions across mechanical, electrical, and thermal boundaries. Collaborate with manufacturing to ensure designs are producible, inspectable, and scalable. Engage with suppliers on technically critical components and design decisions. Prototyping, Testing & Validation Support assembly, integration, and test of turbomachinery hardware. Define validation strategies including spin testing, thermal testing, and system-level operation. Lead root cause analysis and drive design iteration for test failures or performance gaps. Remain hands-on in hardware bring-up, troubleshooting, and refinement. Technical Influence Act as a subject matter expert in turbomachinery mechanical design and rotating systems. Provide technical guidance and design reviews across the team without direct people management responsibility. Influence engineering direction through deep expertise, data-driven decisions, and strong judgment. Contribute to technical roadmap, risk identification, and mitigation strategies. Required Qualifications & Skills: B.S. in Mechanical Engineering or related field. 8+ years of experience designing high-speed rotating machinery (turbines, compressors, or similar systems). Deep expertise in structural analysis and mechanical design of turbomachinery. Experience with bearings, seals, and high-speed shafting design. Expert-level proficiency with analysis tools (e.g., ANSYS) and advanced use of NX and Teamcenter for complex design, simulation, and product lifecycle management. Strong understanding of tolerancing, GD&T, and precision mechanical assembly. Experience owning hardware through design, build, and test cycles. Hands-on experience with assembly, integration, and troubleshooting of turbomachinery. Strong system-level thinking and mechanical intuition. Excellent engineering judgment and decision-making capability. Ability to influence without authority across cross-functional teams. Clear communicator capable of articulating complex technical concepts. High ownership mindset and accountability for hardware outcomes. Ability to operate effectively in a fast-paced, first-of-a-kind development environment. Desired Qualifications & Skills: 10+ years of turbomachinery or rotating equipment experience. M.S. or Ph.D. in Mechanical Engineering. Experience with closed-loop Brayton cycle systems or similar energy systems. Familiarity with high-temperature materials and extreme environment design. Experience integrating mechanical systems with high-speed electric machines. Prior experience as a Responsible Engineer for complex hardware. Experience scaling hardware from prototype to production. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today's advanced reactor builders don't wait for job postings. They join the winning team. If that's you, contact us directly for immediate opportunities: . We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant's capacity to serve in compliance with U.S. export controls. Compensation Range: $200,500 - $314,475
Job Description Job Description About Radiant Radiant is an El Segundo, CA-based startup building the world's first mass-produced, portable nuclear microreactors. The company's first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant's unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Principal Turbomachinery Engineer to serve as the Responsible Engineer for the turbomachinery within our nuclear-driven power generation system. This role owns the mechanical design, integrity, and performance of the core rotating assembly at the heart of our 1MW closed-loop Brayton cycle. You will define and drive the mechanical architecture of high-speed rotating hardware operating at extreme temperatures, pressures, and rotational speeds. As a deeply technical individual contributor, you will set direction for rotor dynamics, structures, bearings, seals, and system integration while working closely with electrical, thermal, and manufacturing teams. This is a hands-on, high-ownership role focused on technical excellence, sound engineering judgment, and delivering reliable, production-ready turbomachinery. Responsibilities & Duties: Technical Ownership & System Architecture Serve as Responsible Engineer for the turbomachinery mechanical system. Own the mechanical architecture and design strategy for high-speed rotating assemblies (up to 30 krpm). Lead rotor dynamics, structural integrity, and life analysis for rotating components and assemblies. Define and flow down requirements from system-level constraints including thermal, structural, and operational environments. Make key technical decisions on rotor layout, shafting, bearings, seals, materials, and clearances. Ensure designs meet performance, reliability, safety, and regulatory requirements. Establish and uphold standards for mechanical design rigor, analysis quality, and documentation. Mechanical Design & Analysis Lead detailed design of turbomachinery components including rotors, shafts, housings, and support structures. Test and validate rotordynamic systems, driving model correlation, risk reduction, and performance verification. Perform and review structural and thermal analysis to ensure integrity under high-speed and high-temperature operation. Define tolerances, fits, stack-ups, and alignment strategies for precision rotating assemblies. Partner with electrical engineering on alternator rotor integration, including electromagnetic and structural coupling. Cross-Functional Integration Partner closely with turbomachinery aero, motor design, thermal, manufacturing, and test teams. Ensure seamless integration between turbine, compressor, and alternator subsystems. Drive clear interface definitions across mechanical, electrical, and thermal boundaries. Collaborate with manufacturing to ensure designs are producible, inspectable, and scalable. Engage with suppliers on technically critical components and design decisions. Prototyping, Testing & Validation Support assembly, integration, and test of turbomachinery hardware. Define validation strategies including spin testing, thermal testing, and system-level operation. Lead root cause analysis and drive design iteration for test failures or performance gaps. Remain hands-on in hardware bring-up, troubleshooting, and refinement. Technical Influence Act as a subject matter expert in turbomachinery mechanical design and rotating systems. Provide technical guidance and design reviews across the team without direct people management responsibility. Influence engineering direction through deep expertise, data-driven decisions, and strong judgment. Contribute to technical roadmap, risk identification, and mitigation strategies. Required Qualifications & Skills: B.S. in Mechanical Engineering or related field. 8+ years of experience designing high-speed rotating machinery (turbines, compressors, or similar systems). Deep expertise in structural analysis and mechanical design of turbomachinery. Experience with bearings, seals, and high-speed shafting design. Expert-level proficiency with analysis tools (e.g., ANSYS) and advanced use of NX and Teamcenter for complex design, simulation, and product lifecycle management. Strong understanding of tolerancing, GD&T, and precision mechanical assembly. Experience owning hardware through design, build, and test cycles. Hands-on experience with assembly, integration, and troubleshooting of turbomachinery. Strong system-level thinking and mechanical intuition. Excellent engineering judgment and decision-making capability. Ability to influence without authority across cross-functional teams. Clear communicator capable of articulating complex technical concepts. High ownership mindset and accountability for hardware outcomes. Ability to operate effectively in a fast-paced, first-of-a-kind development environment. Desired Qualifications & Skills: 10+ years of turbomachinery or rotating equipment experience. M.S. or Ph.D. in Mechanical Engineering. Experience with closed-loop Brayton cycle systems or similar energy systems. Familiarity with high-temperature materials and extreme environment design. Experience integrating mechanical systems with high-speed electric machines. Prior experience as a Responsible Engineer for complex hardware. Experience scaling hardware from prototype to production. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today's advanced reactor builders don't wait for job postings. They join the winning team. If that's you, contact us directly for immediate opportunities: . We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant's capacity to serve in compliance with U.S. export controls. Compensation Range: $200,500 - $314,475