About 1X

We’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 Team

The 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 Charter

Generate 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 Outcomes

Develop and execute battery test campaigns that generate high-quality data for performance, aging, safety, and reliability analysis
Create robotic duty-cycle test profiles that accurately represent real-world operating conditions, including transient loads, regenerative events, and continuous operation
Identify battery degradation mechanisms, failure modes, and performance limitations through structured testing and analysis
Support validation of battery management systems, including SoC, SoH, fault detection, and protection strategies
Deliver actionable insights and recommendations that improve battery design, algorithms, safety, and field performance

Key Competencies

Strong understanding of lithium-ion battery behavior, degradation mechanisms, and safety considerations
Hands-on laboratory experience with battery testing equipment and experimental validation methods
Strong analytical mindset with the ability to extract meaningful insights from large datasets
Excellent troubleshooting and root-cause analysis skills
Strong communication and documentation skills that support cross-functional engineering collaboration

Minimum Requirements

BS or MS in Electrical Engineering, Mechanical Engineering, Energy Systems, or a related field
2+ years of experience in battery testing, validation, reliability engineering, or a related field
Hands-on experience working with lithium-ion cells, modules, or battery packs
Experience operating battery cyclers, environmental chambers, and laboratory test equipment
Experience analyzing test data using Python, MATLAB, or similar technical computing tools
Comfortable working in laboratory environments and following rigorous safety procedures

Preferred Skills

Experience testing batteries for robotics, automotive, aerospace, industrial equipment, or other high-reliability systems
Familiarity with battery management systems (BMS), SoC/SoH estimation, and battery algorithms
Experience developing automated test systems and scripting test workflows
Familiarity with battery safety and certification standards such as UN38.3, IEC 62133, UL, or ISO 26262
Experience with environmental, thermal, vibration, abuse, or durability testing
Experience analyzing field data and supporting fleet-level reliability investigations

What 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 + Equity

Benefits

Comprehensive medical, dental, and vision coverage
Generous paid time off, company holidays, and parental leave
401(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) options
Commuter benefits (transit and parking)
Short-term and long-term disability, and life insurance
Employee Assistance Program (EAP) for mental health, financial, and personal support
Onsite snacks and catered lunches

Equal Opportunity Employer

1X 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.

Battery Test Engineer - Robotics