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Open Positions

StarCube is developing compact, factory-manufactured nuclear microreactors that deliver safe, reliable, carbon-free energy anywhere it is needed most. We are hiring engineers and technicians who want to take that from concept to deployment. Explore our open roles below.

Construction EngineerConstruction Engineer, Senior / LeadershipElectrical EngineerElectrical Engineer, Senior / LeadershipMechanicMechanical EngineerMechanical Engineer, Senior / LeadershipMechanic, Senior / LeadershipNuclear EngineerNuclear Engineer, Senior / LeadershipThermodynamics EngineerThermodynamics Engineer, Senior / Leadership

Construction Engineer

Engineering
Portsmouth, NH
Full-time

Support the planning and execution of microreactor construction, installation, and site integration activities.

Key Responsibilities

  • Develop construction plans, schedules, and cost estimates for modular reactor deployments.
  • Oversee civil, structural, and installation work while ensuring nuclear quality standards.
  • Coordinate with design teams for constructability reviews.
  • Manage subcontractors, safety programs, and field quality assurance.

Requirements

  • Degree in Civil, Mechanical, or Construction Engineering.
  • 4 to 8 years of experience in industrial/power plant construction or other relevant fields (nuclear experience a strong plus).
  • Knowledge of construction codes and project management tools.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Construction Engineer, Senior / Leadership

Engineering
Portsmouth, NH
Full-time

Lead construction strategy and execution for our microreactor projects from site preparation through commissioning.

Key Responsibilities

  • Lead overall construction planning, modular integration, and deployment logistics.
  • Oversee multidisciplinary construction teams and regulatory compliance on-site.
  • Drive innovation in rapid-deployment construction techniques for nuclear systems.
  • Manage budgets, schedules, risks, and stakeholder interfaces.

Requirements

  • Advanced experience (10+ years) with leadership in nuclear or heavy industrial construction projects.
  • Strong safety and quality leadership track record.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Electrical Engineer

Engineering
Portsmouth, NH
Full-time

Design and implement electrical systems for our microreactors, focusing on power distribution, instrumentation, control systems, and integration with nuclear safety features.

Key Responsibilities

  • Design low- and medium-voltage power systems, cabling, and grounding for reactor modules.
  • Develop instrumentation and control (I&C) architectures and safety-related electrical systems.
  • Perform load calculations, fault analysis, and electromagnetic compatibility (EMC) assessments.
  • Support integration testing, commissioning, and troubleshooting of electrical subsystems.
  • Collaborate with nuclear and mechanical teams on system-level requirements and interfaces.

Requirements

  • Bachelor's degree in Electrical Engineering or a related field.
  • 4 to 8 years of experience in power systems, controls, or industrial electrical design (nuclear or energy sector preferred).
  • Proficiency with tools like SolidWorks Electrical, AutoCAD Electrical, MATLAB/Simulink, or similar.
  • Knowledge of relevant standards (IEEE, NEC, IEC).
  • Hands-on experience with hardware integration and testing.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Electrical Engineer, Senior / Leadership

Engineering
Portsmouth, NH
Full-time

Lead the electrical engineering function, defining architecture for power, controls, and safety systems while ensuring compliance with stringent nuclear standards.

Key Responsibilities

  • Architect and lead the design of reactor electrical and I&C systems, including digital and analog safety systems.
  • Oversee power conversion, distribution, and backup power solutions tailored to microreactor constraints.
  • Lead technical reviews, supplier selection, and qualification of electrical components for nuclear environments.
  • Mentor the electrical team and coordinate with regulators on electrical aspects of licensing.
  • Drive innovation in compact, high-reliability electrical designs for harsh environments.

Requirements

  • Degree in Electrical Engineering or similar.
  • 10+ years of experience, including leadership roles in complex energy or nuclear projects.
  • Strong project leadership and cross-functional management skills.
  • Bonus: deep expertise in nuclear-grade I&C, redundancy, and qualification (e.g., IEEE 323, 344).

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Mechanic

Operations
Portsmouth, NH
Full-time

Support the assembly, maintenance, and testing of microreactor prototypes and components in our fabrication and test facilities.

Key Responsibilities

  • Perform precision assembly, disassembly, and maintenance of mechanical nuclear systems.
  • Conduct hands-on fabrication, welding, and fitting of reactor components.
  • Support test campaigns, troubleshooting, and iterative improvements.
  • Follow strict safety, quality, and procedural protocols in a radiological-controlled environment.
  • Collaborate with engineers to implement design changes and document work.

Requirements

  • Technical certification or Associate's degree in Mechanical Technology, or relevant experience.
  • 4 to 8 years of experience as a mechanic in power generation, aerospace, or nuclear facilities.
  • Proficient in reading blueprints, using precision tools, and performing alignments.
  • Experience with heavy machinery, rigging, and confined-space work.
  • Commitment to safety culture and attention to detail.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Mechanical Engineer

Engineering
Portsmouth, NH
Full-time

Design and analyze structural and mechanical components for our microreactors, ensuring durability under extreme conditions.

Key Responsibilities

  • Perform mechanical design, stress analysis (FEA), and thermal-mechanical evaluations.
  • Develop reactor vessel, piping, and structural systems using CAD (SolidWorks or similar).
  • Support material selection, fabrication processes, and qualification testing.
  • Collaborate on vibration, seismic, and transportability analyses.

Requirements

  • Bachelor's or Master's in Mechanical Engineering.
  • 4 to 8 years of experience in mechanical design in a multidisciplinary environment (e.g., energy, aerospace, nuclear, or high-pressure systems).
  • Proficiency in FEA (ANSYS or similar) and CAD.
  • Bonus: knowledge of ASME codes and nuclear design standards.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Mechanical Engineer, Senior / Leadership

Engineering
Portsmouth, NH
Full-time

Lead mechanical system design and serve as a technical authority for structural integrity and integration across the reactor platform.

Key Responsibilities

  • Lead the mechanical architecture and detailed design of core structures and auxiliary systems.
  • Oversee FEA, fatigue, and fracture mechanics analyses for nuclear service conditions.
  • Mentor mechanical engineers and drive design-for-manufacturability initiatives.
  • Interface with construction, manufacturing, and regulatory teams.

Requirements

  • Advanced degree and/or 10+ years of experience with leadership in mechanical systems for nuclear or advanced energy projects.
  • Bonus: expert knowledge of ASME BPVC, seismic qualification, and advanced materials.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Mechanic, Senior / Leadership

Operations
Portsmouth, NH
Full-time

Oversee mechanical assembly and maintenance operations, mentor technicians, and ensure high standards for prototype fabrication and field support.

Key Responsibilities

  • Lead assembly and integration teams for reactor modules and test rigs.
  • Develop and improve maintenance procedures, tooling, and best practices.
  • Coordinate with engineering on manufacturability and field deployment readiness.
  • Supervise technicians, enforce quality assurance, and manage shop safety programs.
  • Support training programs and knowledge transfer for complex nuclear systems.

Requirements

  • 10+ years of progressive experience in mechanical assembly and maintenance, preferably nuclear or high-reliability sectors.
  • Leadership experience and strong mentoring skills.
  • Expert-level proficiency with mechanical systems; welding certifications a plus.
  • Deep understanding of nuclear safety and quality standards.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Nuclear Engineer

Engineering
Portsmouth, NH
Full-time

Contribute to the design, analysis, and licensing of our microreactor systems, working across multidisciplinary teams to ensure nuclear safety, regulatory compliance, and performance optimization.

Key Responsibilities

  • Perform nuclear core design, neutronics analysis, and radiation shielding calculations using industry-standard tools (e.g., MCNP, SCALE).
  • Support safety analysis, transient modeling, and probabilistic risk assessments.
  • Contribute to regulatory engagement with the NRC or equivalent bodies, including technical reports and white papers.
  • Collaborate on fuel cycle analysis, criticality safety, and thermal-hydraulics integration.
  • Participate in prototyping, testing, and iterative design improvements.

Requirements

  • Degree in Nuclear Engineering or a related field.
  • 4 to 8 years of relevant experience in nuclear reactor design, operations, or R&D.
  • Strong knowledge of nuclear physics, reactor kinetics, and safety principles.
  • Experience with nuclear simulation software and data analysis tools.
  • Ability to thrive in a fast-paced, collaborative startup setting with ownership of deliverables.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Nuclear Engineer, Senior / Leadership

Engineering
Portsmouth, NH
Full-time

Drive the nuclear design strategy for our microreactor program. Provide technical leadership, mentor engineers, and interface with regulators and external stakeholders to advance our systems toward deployment.

Key Responsibilities

  • Lead nuclear system design, core optimization, and safety case development from concept through licensing.
  • Oversee neutronics, shielding, and fuel performance analyses; define technical roadmaps and risk mitigation strategies.
  • Serve as a primary point of contact for NRC licensing and regulatory interactions.
  • Mentor mid-level engineers and foster cross-functional collaboration with mechanical, electrical, and thermal teams.
  • Conduct technical reviews, support prototyping campaigns, and contribute to intellectual property development.
  • Guide R&D priorities and help build a high-performing nuclear engineering team.

Requirements

  • Advanced degree (MS or PhD) or equivalent experience in Nuclear Engineering.
  • 10+ years of progressive experience in advanced reactor design, preferably with micro or small modular reactors.
  • Demonstrated leadership in nuclear safety analysis, licensing campaigns, and multidisciplinary projects.
  • Expertise in multiple nuclear codes and standards (e.g., ASME).
  • Proven track record of regulatory engagement and technical publication.
  • Strong leadership, communication, and strategic thinking skills. Security clearance eligibility required.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Thermodynamics Engineer

Engineering
Portsmouth, NH
Full-time

Model and optimize heat transfer, fluid flow, and thermodynamic cycles within our microreactor systems.

Key Responsibilities

  • Perform thermal-hydraulic analysis, CFD simulations, and system-level thermodynamic modeling.
  • Design and analyze cooling systems, heat exchangers, and power conversion cycles.
  • Support safety transients, failure analysis, LOCA analysis, and performance optimization.
  • Work with nuclear and mechanical teams on integrated modeling.

Requirements

  • Degree in Mechanical, Nuclear, or Chemical Engineering with thermodynamics experience.
  • 4 to 8 years of experience in thermal-hydraulics for energy systems (nuclear preferred) or other relevant thermodynamics experience.
  • Proficiency with RELAP, TRACE, ANSYS Fluent, or similar tools.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

Thermodynamics Engineer, Senior / Leadership

Engineering
Portsmouth, NH
Full-time

Lead thermal and fluid systems design, ensuring efficient and safe heat management across the reactor.

Key Responsibilities

  • Define and lead thermal-hydraulic strategy and multi-physics coupling.
  • Oversee advanced simulations, validation testing, and code qualification.
  • Provide leadership on passive safety systems and efficiency improvements.
  • Mentor team members and support regulatory thermal analysis submissions.

Requirements

  • Advanced degree and/or 10+ years of leadership experience in reactor thermal-hydraulics.

What We Offer

Competitive compensation, meaningful equity, comprehensive health benefits, flexible work, and the opportunity to make a direct impact on next-generation nuclear technology.

Apply for this role

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