About 1XWe're building humanoid robots that work in home - doing the chores, handling the tasks, and giving people their time back. Simple, but it's not.To do this right, we have to solve robotics, AI, manufacturing - at the same time, at scale, in a form factor that has to be safe enough to live with your family. If you're inspired by this, you'll thrive here. We've been at this since 2014 and we're at the point where the hard problems are behind us and the hard work is in front of us.NEO is our flagship - a home robot designed to move, learn, and operate in the real world alongside real people.
We're not demoing it - we're shipping it. We're excited to meet you, if this excites you.If you've spent your career working on problems that matter and want to see them actually reach the world - this is that moment. We're scaling, we're hiring with intention, and we need people who want to build something that will genuinely change how humans spend their time - safely creating abundance for all.About the TeamThe Energy Systems Engineering team develops the battery systems that power NEO throughout its daily operation. From cell characterization and battery management algorithms to pack design and system-level energy optimization, the team is responsible for delivering safe, reliable, and high-performance energy systems for humanoid robotics.Battery performance directly impacts robot capability, runtime, reliability, and user experience.
This team works closely with hardware, firmware, controls, robotics, and fleet operations teams to ensure our battery systems perform safely and predictably under demanding real-world conditions.Your CharterGenerate the data that drives battery performance, reliability, and safety.You will design and execute battery testing programs that characterize cells, modules, packs, and complete robotic battery systems under realistic operating conditions. Your work will provide the foundation for battery algorithms, hardware validation, fleet analysis, and long-term reliability improvements.As a Battery Test Engineer, you will play a critical role in understanding how batteries behave in the real world and ensuring our energy systems meet the demands of humanoid robotics.Key OutcomesDevelop and execute battery test campaigns that generate high-quality data for performance, aging, safety, and reliability analysisCreate robotic duty-cycle test profiles that accurately represent real-world operating conditions, including transient loads, regenerative events, and continuous operationIdentify battery degradation mechanisms, failure modes, and performance limitations through structured testing and analysisSupport validation of battery management systems, including SoC, SoH, fault detection, and protection strategiesDeliver actionable insights and recommendations that improve battery design, algorithms, safety, and field performanceKey CompetenciesStrong understanding of lithium-ion battery behavior, degradation mechanisms, and safety considerationsHands-on laboratory experience with battery testing equipment and experimental validation methodsStrong analytical mindset with the ability to extract meaningful insights from large datasetsExcellent troubleshooting and root-cause analysis skillsStrong communication and documentation skills that support cross-functional engineering collaborationMinimum RequirementsBS or MS in Electrical Engineering, Mechanical Engineering, Energy Systems, or a related field2+ years of experience in battery testing, validation, reliability engineering, or a related fieldHands-on experience working with lithium-ion cells, modules, or battery packsExperience operating battery cyclers, environmental chambers, and laboratory test equipmentExperience analyzing test data using Python, MATLAB, or similar technical computing toolsComfortable working in laboratory environments and following rigorous safety proceduresPreferred SkillsExperience testing batteries for robotics, automotive, aerospace, industrial equipment, or other high-reliability systemsFamiliarity with battery management systems (BMS), SoC/SoH estimation, and battery algorithmsExperience developing automated test systems and scripting test workflowsFamiliarity with battery safety and certification standards such as UN38.3, IEC 62133, UL, or ISO 26262Experience with environmental, thermal, vibration, abuse, or durability testingExperience analyzing field data and supporting fleet-level reliability investigationsWhat Does a Successful 1X Team Member Look Like?Team members at 1X who thrive here are builders. They move fast, own their work completely, and treat time like it's the one thing you can't get back - because it is. They say what they mean, finish what they start, and hold themselves to a standard before anyone has to ask.
We push each other to be better, and we do it with honesty and respect.Successful Battery Test Engineers at 1X are deeply curious about how systems behave in the real world. They combine rigorous experimental methods with practical engineering judgment, moving quickly from questions to data to decisions. They care about safety, reliability, and creating the insights that allow better products to be built.Compensation Range$106,400 - $146,300 + EquityBenefitsComprehensive medical, dental, and vision coverageGenerous paid time off, company holidays, and parental leave401(k) plan with company match (100% on the first 3% of contributions, 50% on the next 2%)Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA) optionsCommuter benefits (transit and parking)Short-term and long-term disability, and life insuranceEmployee Assistance Program (EAP) for mental health, financial, and personal supportOnsite snacks and catered lunchesEqual Opportunity Employer1X is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, ancestry, citizenship, age, marital status, medical condition, genetic information, disability, military or veteran status, justice system impact, or any other characteristic protected under applicable federal, state, or local law.