Fluid Systems Engineer — Nuclear Microreactor Tech
Radiant
Radiant is seeking a highly motivated Mechanical Engineer, Fluids Systems to own critical Kaleidos fluid systems from preliminary design through build and production. You will perform thermal hydraulics analysis, select components, and manage manufacturing and testing to enable the first new commercial reactor design in over 50 years by 2026. You will work onsite at El Segundo HQ, collaborating with cross-disciplinary teams, and contribute to trade studies, BOM creation, supplier development, #J-18808-Ljbffr Radiant
- ...first mass-produced, portable nuclear microreactors. The company’... ...is a 1-megawatt, fail-safe microreactor that can be transported... ...leverages modern software engineering to rapidly deliver safe, factory... ...a highly motivated Staff Fluid Systems Engineer to own critical...SuggestedFull timeSummer workRemote workFlexible hoursWeekend work
- Forge Atomics Inc. seeks a Mechanical Engineer, Fluids, to design and deploy advanced fluid systems for nuclear reactors. The role emphasizes high reliability, manufacturability, and rapid timelines, with close collaboration to scale production and support critical test...SuggestedFull timeRelocation
$158k - $219.45k
...world’s first mass-produced, portable nuclear microreactors. Rising energy demand... ...factory-built, 1-megawatt, fail-safe microreactor that can be transported by land, sea,... ...is seeking a highly motivated Staff Fluid Systems Engineer to own critical Kaleidos fluid systems...SuggestedFull timeContract workImmediate startRemote workFlexible hoursWeekend work- Pow.bio in El Segundo, CA, is looking for an Engineering Manager who excels at regulatory processes for nuclear technologies. The role involves overseeing licensing efforts and managing customer interactions. Ideal candidates have a background in engineering, specifically...SuggestedFull time
$100k - $117.5k
...developing the technologies to make this possible, with the ultimate goal of enabling human life on Mars. PROPULSION FLUIDS ANALYST (RAPTOR SYSTEMS ENGINEERING) The Propulsion Fluids Analyst role is responsible for evaluating and improving engine hardware designs...SuggestedTemporary workWeekend work- ...in El Segundo, CA is seeking a highly motivated Electrical Engineer. You will design, model, and analyze electrical systems, support testing and validation, and collaborate with mechanical, software, and nuclear teams to ensure safety and reliability. The role involves...
- Radiant, an El Segundo, CA-based startup, seeks a Principal or Staff Electrical Engineer to define and lead the electrical architecture for Kaleidos, our 1-megawatt microreactor. You will own full-stack PCB development, mixed-signal design, and high-speed interfaces to...
$100.3k - $150.4k
...Fluid Systems Engineer# Welcome!## Fluid Systems EngineerApply: El Segundo, CA: Full time: Posted Today: R016893The Aerospace Corporation is the trusted partner to the nation’s space programs, solving the hardest problems and providing unmatched technical expertise. As...Full timeFor contractorsImmediate startRemote workRelocation packageFlexible hours$133.5k - $190.05k
...mass-produced, portable nuclear microreactors. The... ...1-megawatt, fail-safe microreactor that can be transported... ...leverages modern software engineering to rapidly deliver... ...RoleRadiant is seeking a Systems Engineer to develop,... ...reactor core, structures, fluid systems, electronics,...Full timeSummer workImmediate startRemote workFlexible hoursWeekend work$140.33k - $179.31k
...DC and Huntsville, AL. Join Varda, and work to create a bustling in-space ecosystem. About this Role As a Senior Fluid Systems Engineer on Varda's Payload team, you will develop first of its kind electromechanical fluid-handling hardware that manufactures pharmaceuticals...Permanent employmentFull timeInternshipImmediate startRelocation packageFlexible hours$181.91k - $232.44k
...and Huntsville, AL. Join Varda, and work to create a bustling in-space ecosystem. About this Role As a Principal Fluid Systems Engineer on Varda's Payload team, you will define and lead the development of first-of-its-kind electromechanical fluid handling hardware...Permanent employmentFull timeInternshipImmediate startRelocation packageFlexible hours- Varda Space Industries in El Segundo, CA, seeks a Propulsion Engineer II - Ground Fluids to own end-to-end ground fluid systems across spacecraft programs. You will define architecture, drafts, build, test, and live flight operations while shaping processes and standards...
- Varda Space Industries in El Segundo, CA, is seeking a Propulsion Engineer II - Ground Fluids to own end-to-end ground fluid systems across spacecraft programs. You will define architecture, P&IDs, and build/test activities, and lead propellant loading campaigns across...
- The Aerospace Corporation in El Segundo, CA is seeking a Fluid Systems Engineer (Senior MST) to lead analysis, modeling, and testing of fluid systems for space, launch, and reentry vehicles. This on-site role requires at least 4 days onsite and a strong background in fluid...
- Varda Space Industries in El Segundo, CA, is actively seeking a Senior Fluid Systems Engineer to develop first‑of‑its‑kind electromechanical fluid‑handling hardware for pharmaceutical manufacturing in microgravity, enduring hypersonic reentry, and returning to Earth for...
- Radiant is seeking a Materials Engineer in El Segundo, CA to lead materials testing, property evaluation, and data-driven design decisions for Kaleidos. You will guide materials selection, procure characterization equipment, and improve manufacturing processes to achieve...
- ...mass‑produced, portable nuclear microreactors. The company... ...a 1-megawatt, fail‑safe microreactor that can be transported anywhere... ...modern software engineering to rapidly deliver safe,... ...core, shielding, control systems, instrumentation, fluid systems, structures, and...Full timeSummer workRemote workFlexible hoursShift work
- Radiant, an El Segundo, CA-based startup, is building portable nuclear microreactors. We seek a Test Engineer to drive mission-critical test operations for development, qualification, and acceptance of Kaleidos reactor technology. You will bridge engineering, operations...
- Radiant, based in El Segundo, CA, seeks a Senior Test Engineer to lead mission-critical test operations for the Kaleidos reactor development. You will assume the roles of Test Conductor and Test Director, partnering with design engineers to craft robust test methods and...
- Radiant, an El Segundo, CA-based startup developing portable nuclear microreactors, seeks a highly motivated Thermal Engineer to join our team. You will perform thermal analysis and CFD to evaluate Kaleidos system design and contribute to fast-paced, hands-on engineering....
$158k - $247.28k
Pow.bio is looking for a Senior Electrical Engineer at their El Segundo HQ. In this role, you will oversee the design of electrical control systems for nuclear microreactors, ensuring safety and reliability. Applicants should have a Bachelor's in Electrical Engineering...Flexible hours- Radiant in El Segundo, CA, is seeking a Senior Mechanical Engineer to design and develop critical structures within Kaleidos. You will solve challenges creating efficient, reliable structures that withstand extreme temperatures and fit tight volumetric constraints. You...
$183k - $261k
...Sr. Systems Engineer – Command & Control (C2) Satellite System Full Time Professional El Segundo, CA, US 2 days ago Requisition ID: 1153 Salary Range: $183,000.00 To $261,000.00 Annually Tech 7 is seeking a Senior Systems Engineer – Command & Control (C2) Satellite...Full timeFor subcontractorWork at officeLocal area- ...the world's first mass-produced, portable nuclear microreactors. Rising energy demand is... ...a factory-built, 1-megawatt, fail-safe microreactor that can be transported by land, sea, or... ...Radiant is seeking a driven Senior Nuclear Engineer to join our team! You will own modeling...Full timeContract workImmediate startRemote workFlexible hoursWeekend work
- ...the world's first mass-produced, portable nuclear microreactors. Rising energy demand is... ...a factory-built, 1-megawatt, fail-safe microreactor that can be transported by land, sea, or... ...is seeking a highly motivated Nuclear Engineer responsible for developing nuclear engineering...Full timeContract workImmediate startRemote workFlexible hoursWeekend work
$115k - $130k
...impact. At Forge, we believe nuclear fission is the key to solving... ...nuclear fission. The Nuclear Engineer role is responsible for end-to... ...de-risking complex physical systems, and will be highly motivated... ...regulatory limits Work closely with fluids, structures, components and...Full timeInternshipWork at officeLocal areaRelocationWeekend work- Radiant, an El Segundo, CA-based startup, seeks a Lead Nuclear Engineer to guide the nuclear design and analysis group on core physics, shielding... ...reliability, portability, and performance for the Kaleidos microreactor. You will mentor engineers, collaborate with cross‑...
- ...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... ...development leverages modern software engineering to rapidly deliver safe, factory‑built...Full timeSummer workWork at officeRemote workRelocationFlexible hoursShift workWeekend work
$170k - $183k
...Senior Systems Test Engineer Job Locations US-CA-El Segundo ID 2026-2040 Category Systems Engineer Required... .... We are a leading service and expertise provider for high-tech commercial ventures, spanning communications, earth...Full timeTemporary workFor contractorsWork at officeImmediate startRemote work3 days per week$120k - $160k
...El Segundo, CA, US Date Posted 2026-09-01 Category Engineering and Sciences Subcategory Systems Engineer Schedule Full-Time Shift Day Job Travel Yes... ...developing and deploying the satellites and ground systems for Nuclear Detection System (NDS) capabilities. These systems...Full timeFor contractorsRemote workShift work
Do you want to receive more vacancies?
Subscribe and receive similar vacancies to Fluid Systems Engineer — Nuclear Microreactor Tech. Be the first to apply!
- distributed systems engineer El Segundo, CA
- application system engineer El Segundo, CA
- ground systems engineer El Segundo, CA
- system performance engineer El Segundo, CA
- systems engineer El Segundo, CA
- electronic systems engineer El Segundo, CA
- healthcare systems engineer El Segundo, CA
- senior staff systems engineer El Segundo, CA
- broadcast systems engineer El Segundo, CA
- gps systems engineer El Segundo, CA



