Embedded Firmware Engineer - Battery

requirements are met Implement power converter control loops in firmware: voltage regulation, current regulation, and soft-start sequencing with stability under varying line and load conditions Develop fault detection and protection firmware: input overvoltage/undervoltage, output overcurrent, overtemperature, ground fault, and loss-of-communication with the BMS, each with defined safe-state transitions Key Competencies Deep embedded instincts writing firmware that is correct under real hardware conditions: interrupt timing, DMA conflicts, communication protocol edge cases, and hardware fault behavior First-principles problem solver diagnosing novel failures at the firmware-hardware boundary using lab tools and reasoning from fundamentals, not just vendor documentation or established patterns Safety-aware by default understanding what “fail safe” means in a physical system and treats protection logic, fault detection, and safe-state transitions as first-class firmware concerns Effective cross-functional partner translating firmware constraints and failure modes clearly to hardware architects, electrical engineers, and systems engineers; supports bring-up without waiting to be directed Minimum

Requirements 5+ years of embedded firmware development in C/C++ on real hardware, with direct experience managing interrupts, DMA, and timing-critical execution (7+ years for senior/staff-level positions) Power conversion fundamentals working understanding of switched-mode power supply operation: common AC-DC topologies (flyback, LLC, phase-shifted full bridge), power factor correction stages, transformer isolation, and how firmware-controlled parameters (switching frequency, duty cycle, phase shift) affect converter behavior Battery charging knowledge: understanding of lithium-ion charge protocols (CC-CV, multi-stage), the relationship between charge rate and cell degradation, and how temperature and cell age affect charge termination criteria Embedded bus fluency hands-on CAN implementation for charger-to-BMS coordination, plus additional embedded interfaces (SPI, I²C, UART) for communication with power controller ICs, monitoring devices, and auxiliary circuits Hardware debug at the firmware boundary experience using oscilloscopes, current probes, and power analyzers to diagnose problems that span firmware control behavior, converter waveform quality, and thermal performance Preferred Skills Domain depth in one or more areas relevant to humanoid robot subsystems: distributed real-time communication bus firmware, switched-mode power conversion and lithium-ion battery charge management, or motor drive and actuator control firmware Experience with safety-critical or fault-tolerant embedded systems; familiarity with safety integrity standards such as IEC 61508 or ISO 26262 Familiarity with real-time operating systems (FreeRTOS, SafeRTOS, or similar) Background in robotics, autonomous systems, or complex electromechanical products 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. =

Compensation Range $200,000 – $280,000 + 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.

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