Engineering Internship – Mechanical Engineer

Moonwatt

YOUR MISSION We are seeking a Hardware Validation and Compliance Engineer to lead the complete testing and certification strategy for our Battery Energy Storage Systems.  This is a critical role at the juncture of multiple domains that will define and execute comprehensive validation campaigns, manage relationships with third-party testing laboratories, and ensure our products meet all applicable safety, performance, and regulatory standards across multiple markets. You will be the technical owner of our compliance roadmap, working cross-functionally with hardware, electrical, mechanical, and software engineering teams to translate product requirements into test specifications, oversee execution, and drive certification to completion. Your work will be essential to bringing our innovative sodium-ion BESS technology to utility-scale deployments worldwide.   What you will do * Develop and maintain the product compliance roadmap for target markets. Stay up-to-date with evolving industry regulations and standards, and proactively adapt the compliance plan as needed. * Identify, qualify, and manage relationships with third-party testing laboratories (UL, TÜV, Intertek, CSA, etc.). * Define and execute comprehensive hardware validation test plans covering electrical safety, performance, environmental, EMC/EMI, thermal, mechanical, and reliability testing. * Work closely with hardware, electrical, and mechanical engineering teams to ensure designs are optimized for testability and compliance. Interface with supply chain and manufacturing to ensure component and production compliance. Collaborate cross-functionally to align testing and compliance timelines with Moonwatt’s roadmap. * Develop detailed test specifications, procedures, and acceptance criteria aligned with product requirements and applicable standards. Coordinate and oversee testing campaigns at internal facilities and external accredited laboratories. Travel to site as needed to oversee testing and build relationships. * Analyze test results, identify root causes of failures, and work with engineering teams to improve designs and solve issues. * Create and maintain validation and compliance documentation packages for customer submissions and regulatory filings * Be the main point of contact for compliance, both internally but also externally towards testing laboratories, authorities having jurisdiction, and customers.  YOUR PROFILE Must-have Qualifications * Education: Bachelor's or Master's degree in Electrical Engineering, Mechanical Engineering, or related technical field * Experience: 5+ years of experience in hardware validation, testing, and/or compliance engineering for electrical or electronic products * Standards Knowledge: Familiarity with electrical safety and performance standards, particularly with battery standards such as UL1973, UL9540, IEC 62619, UN38.3, NFPA 855, etc. * Testing Expertise: Hands-on experience developing test plans, executing tests (electrical safety, EMC, environmental, performance), and analyzing results * Laboratory Experience: Track record working with accredited third-party testing laboratories and managing certification projects * Technical Skills: Strong understanding of electrical systems, power electronics, battery technologies, and energy storage system architectures * Project Management: Ability to manage multiple concurrent projects with competing priorities, budgets, and timelines * Communication: Excellent written and verbal communication skills; ability to present complex technical information to diverse audiences * Language: Fluent in English (written and spoken).  * Willingness to travel internationally (approximately 30%) for testing campaigns and site visits Nice-to-have qualifications Experience with battery energy storage systems (BESS), battery management systems (BMS), or power conversion systems (PCS/inverters) * Familiarity with utility-scale energy storage applications and grid interconnection requirements * Hands-on experience of fire safety testing including UL9540A thermal runaway propagation testing * Experience working in startup or fast-paced product development environments * Chinese-speaking is a plus. WHY US? * Be part of a fast-growing startup delivering next-generation clean energy technology. * Work on high-impact projects alongside experienced engineers across the EU. * Competitive salary, benefits, and opportunities for growth in the energy tech sector. WE PARTICULARLY ENCOURAGE WOMEN AND INDIVIDUALS FROM UNDERREPRESENTED BACKGROUNDS TO APPLY EVEN IF YOU DON'T MEET 100% OF THE LISTED QUALIFICATIONS. POTENTIAL AND MOTIVATION MATTERS AS MUCH AS EXPERIENCE.

Freeform

ADDITIVE ENGINEERING INTERNSHIP (FALL 2026)  Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation. By treating manufacturing as a single integrated system, we unlock a new era of innovation where complex hardware is designed, built, and scaled without limits. As an Additive Engineering Intern at Freeform, you will contribute to the development and scaling of our advanced metal 3D printing processes, including design for additive manufacturing (DFAM) feedback, print file preparation, toolpath automation, part quality analysis, and end-to-end process improvement. You will work closely with mechanical, electrical, software, and manufacturing engineers to support all stages of print development for high-volume production. Interns at Freeform own meaningful cradle-to-grave projects. Using first-principles thinking, you will help define test methods, evaluate solutions, iterate quickly, and synthesize information from engineering drawings, in-situ machine data, post-processing results, and inspection data to draw conclusions that improve printing and downstream machining processes. 3D printing experience is not required to be successful here - we look for smart, motivated, collaborative engineers who love solving hard problems and creating amazing technology!  Responsibilities:  * Own a cradle to grave project that delivers meaningful impact to critical print factory capabilities or customer print workflows * Support all stages of print development including design for additive manufacturing feedback, file preparation, printing, post-processing, and quality control * Analyze in-situ data and post-print part quality to drive continuous improvement in system performance * Use first-principles thinking to define problems, develop test methods, evaluate solutions, iterate, and provide technical recommendations  Basic Qualifications:  * Currently enrolled in a bachelor’s degree in mechanical or aerospace engineering from an ABET accredited university or college  * Hands on design experience from internships or engineering clubs such as FSAE, Baja SAE, solar car, rocket club, robotics club, or similar  * Strong grasp of mechanical engineering fundamentals and comfortable taking a first-principles approach to solving problems   Nice to Have:  * Advanced degree (Master's, PhD) in mechanical or aerospace engineering * Experience with metal 3D printing or additive manufacturing processes * Experience with process development for metal additive manufacturing * Scripting experience in MATLAB or similar tools for toolpath generation * Experience with DFM and GD&T * Experience with CNC machining * Passion for improving the state of metal 3D printing * Comfortable working in fast-paced, ambiguous environments and iterating quickly (comfortable building the plane as we fly it) * Strong communicator who collaborates across disciplines and proactively seeks support when needed * Willing to take ownership of tasks big and small, with a hands-on, problem-solving mindset * Strong work ethic with a refuse-to-fail mindset * Demonstrated indicators of excellence and/or achieving success against adversity (i.e. top academic performance, leadership in engineering clubs, first-generation college student, or other examples of resilience and achievement) Location:  * Based in Hawthorne, our vertically integrated facility brings technology development, R&D, and production together under one roof. We operate at the center of LA’s deep tech ecosystem, surrounded by some of the most ambitious hardware innovation happening anywhere in the country. What We Offer: * We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions  * We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology  * Compensation and Benefits  * The compensation for this role:  * Engineering Intern/Undergraduate: $30/hour * Engineering Intern/Masters: $32.50/hour * Engineering Intern/PhD: $35/hour * Relocation assistance provided * Free daily catered lunch and dinner, and fully stocked kitchenette  * Casual dress, flexible work hours, and regular catered team building events  * Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform 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.

Freeform

PROCESS ENGINEERING INTERNSHIP (FALL 2026)  Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation. By treating manufacturing as a single integrated system, we unlock a new era of innovation where complex hardware is designed, built, and scaled without limits. As a Process Engineering Intern at Freeform, you will help develop and refine novel processes for some of the world’s most advanced metal 3D printing systems. You will work closely with experienced engineers to study complex, multi-physics behavior within the printing process, building a foundational understanding of the system and applying those insights to support the development of next-generation processes. You’ll collaborate with mechanical, software, and simulation engineers to analyze large in-situ data sets and post-print material characteristics, contributing to rapid iteration and continuous improvement of the printing technology using data-driven and machine-learning-enabled approaches. 3D printing experience is not required to be successful here - we look for smart, motivated, collaborative engineers who love solving hard problems and creating amazing technology!  Responsibilities:  * Assist the Process Engineering team in developing a deep understanding of the metal additive process and hardware operation by analyzing massive in-situ data sets to gain insight into physical mechanisms of the printing process * Execute experiments and analyze data to improve metal additive processes * Perform post-build metrology measurements and analysis of material properties such as tensile strength, surface roughness, and alloy microstructure * Assist in the development and implementation of tool qualification procedures  Basic Qualifications:  * Currently pursuing Bachelor's degree in material science, physics, or similar engineering discipline * Experience with experimental design and statistical data analysis * Strong data analysis skills and ability to interpret important information from extremely large data sets * Experience with Python and/or MATLAB Nice to Have:  * Undergraduate research experience in material science, physics, mechanical engineering * Process development experience from cutting edge industries such as semiconductor, solar, or displays * Experience with statistical data analysis software such as R, JMP, or Minitab * Passion for improving the state of metal 3D printing * Comfortable working in fast-paced, ambiguous environments and iterating quickly (comfortable building the plane as we fly it) * Strong communicator who collaborates across disciplines and proactively seeks support when needed * Willing to take ownership of tasks big and small, with a hands-on, problem-solving mindset * Strong work ethic with a refuse-to-fail mindset * Demonstrated indicators of excellence and/or achieving success against adversity (i.e. top academic performance, leadership in engineering clubs, first-generation college student, or other examples of resilience and achievement) Location:  * Based in Hawthorne, our vertically integrated facility brings technology development, R&D, and production together under one roof. We operate at the center of LA’s deep tech ecosystem, surrounded by some of the most ambitious hardware innovation happening anywhere in the country. * Our fast-paced, cross-functional environment is built on close collaboration, and as such, this role requires full-time onsite presence (five days a week), with very limited exceptions. What We Offer: * We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions  * We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology  * Compensation and Benefits  * The compensation for this role:  * Engineering Intern/Undergraduate: $30/hour * Engineering Intern/Masters: $32.50/hour * Engineering Intern/PhD: $35/hour * Relocation assistance provided * Free daily catered lunch and dinner, and fully stocked kitchenette  * Casual dress, flexible work hours, and regular catered team building events  * Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform 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.