Senior to Staff Firmware Engineer - Battery Charger

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  "description": "<p style=\"text-align:start;\"><strong><span style=\"color:#121317\">About 1X</span></strong></p><p style=\"text-align:start;\"><span style=\"color:#121317\">We’re an AI and robotics company based in San Carlos, California, on a mission to build a truly </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">abundant society through general‑purpose robots capable of performing any kind of work </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">autonomously.</span></p><p style=\"text-align:start;\"><span style=\"color:#121317\"><br>We believe that to truly understand the world and grow in intelligence, humanoid robots must live </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">and learn alongside us. That’s why we’re focused on developing friendly home robots designed to </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">integrate seamlessly into everyday life.<br></span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">We’re looking for curious, driven, and passionate people who want to help shape the future of </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">robotics and AI. If this mission excites you, we’d be thrilled to hear from you and explore how you </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">might contribute to our journey.</span></p><p style=\"min-height: 1.7em;\"></p><p><strong><span style=\"color:#4F4749\">Role Overview</span></strong></p><p><span style=\"color:#121317\">We are looking for a cross-functional Firmware or Embedded Engineer to develop and maintain<br>the firmware for the battery charging system of a production humanoid robot. In this role, you<br>will own the embedded software that controls AC-DC power conversion, charge profile<br>management, and the interface between the charger and the battery management system.<br></span></p><p><span style=\"color:#121317\">You will work closely with hardware architects, electrical engineers, systems engineers, and test<br>engineers to ensure firmware reliably bridges hardware capabilities and higher-level system<br>requirements across prototype and production platforms.</span></p><p><span style=\"color:#121317\"><br>The charger is a consumer-facing subsystem that must meet regulatory emissions<br>requirements, operate safely in household environments, and manage the charge cycle for a<br>high-energy lithium-ion pack that experiences demanding discharge profiles between charges.<br>Charging behavior directly affects battery longevity, system availability, and user safety. The<br>ideal candidate understands power conversion from magnetics and control loop fundamentals,<br>writes firmware that is robust under component variation and fault conditions, and can reason<br>about the interactions between charger behavior, battery chemistry, and EMC performance.<br></span></p><p><strong><span style=\"color:#121317\">Responsibilities</span></strong></p><ul><li><p><span style=\"color:#121317\">Develop and maintain charger firmware controlling AC-DC power conversion stages,<br>including power factor correction and isolated DC-DC conversion topologies</span></p></li><li><p><span style=\"color:#121317\">Implement charge profile management for multi-series lithium-ion packs: constant-<br>current, constant-voltage, and taper phases with cell-chemistry-appropriate voltage and<br>current limits</span></p></li><li><p><span style=\"color:#121317\">Architect the charger-to-BMS communication interface over CAN or similar embedded<br>bus, coordinating charge current requests, pack voltage feedback, temperature limits,<br>and fault signaling between the two subsystems</span></p></li><li><p><span style=\"color:#121317\">Responsible for the testing, validation, and verification of initial firmware releases to<br>ensure functionality, reliability, and performance requirements are met</span></p></li><li><p><span style=\"color:#121317\">Implement power converter control loops in firmware: voltage regulation, current<br>regulation, and soft-start sequencing with stability under varying line and load conditions</span></p></li><li><p><span style=\"color:#121317\">Develop fault detection and protection firmware: input overvoltage/undervoltage, output<br>overcurrent, overtemperature, ground fault, and loss-of-communication with the BMS,<br>each with defined safe-state transitions</span></p></li><li><p><span style=\"color:#121317\">Support EMC compliance by understanding how firmware-controlled switching<br>frequencies, gate drive timing, and measurement sampling interact with conducted and<br>radiated emissions performance</span></p></li><li><p><span style=\"color:#121317\">Collaborate with hardware architects to define charger hardware requirements, converter<br>topology trade-offs, and the boundary between hardware protection and firmware<br>protection</span></p></li><li><p><span style=\"color:#121317\">Implement production test modes and end-of-line validation routines for charger<br>acceptance, including efficiency measurement, regulation accuracy, and protection trip-<br>point verification</span></p></li><li><p><span style=\"color:#121317\">Develop diagnostic logging and telemetry for charge cycle data, fault history, and<br>component health trending</span></p></li><li><p><span style=\"color:#121317\">Document firmware architecture, interfaces, and assumptions; improve code structure,<br>readability, and maintainability<br></span></p></li></ul><p style=\"min-height: 1.7em;\"></p>",
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  "company_name": "1X Technologies AS",
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  "published_at": "2026-03-04 19:19:51 UTC",
  "requirements": "<p><strong><span style=\"color:#121317\">Requirements</span></strong></p><ul><li><p><span style=\"color:#121317\">Bachelor’s or Master’s degree in Electrical Engineering, Computer Engineering, or a<br>related field</span></p></li><li><p><span style=\"color:#121317\">7+ years of industry experience with embedded systems and real-time firmware<br>development</span></p></li><li><p><span style=\"color:#121317\">Proficiency in C and C++ for embedded targets</span></p></li><li><p><span style=\"color:#121317\">Production charger or power converter firmware experience the candidate has<br>developed or substantially modified firmware controlling an AC-DC or DC-DC power<br>converter in a shipped product. Experience should include closed-loop regulation,<br>protection logic, and charge profile implementation, not solely integration of a digital<br>power controller evaluation board.</span></p></li><li><p><span style=\"color:#121317\">Power conversion fundamentals working understanding of switched-mode power<br>supply operation: common AC-DC topologies (flyback, LLC, phase-shifted full bridge),<br>power factor correction stages, transformer isolation, and how firmware-controlled<br>parameters (switching frequency, duty cycle, phase shift) affect converter behavior</span></p></li><li><p><span style=\"color:#121317\">Battery charging knowledge — understanding of lithium-ion charge protocols (CC-CV,<br>multi-stage), the relationship between charge rate and cell degradation, and how<br>temperature and cell age affect charge termination criteria</span></p></li><li><p><span style=\"color:#121317\">Embedded bus fluency hands-on CAN implementation for charger-to-BMS<br>coordination, plus additional embedded interfaces (SPI, I²C, UART) for communication<br>with power controller ICs, monitoring devices, and auxiliary circuits</span></p></li><li><p><span style=\"color:#121317\">Hardware debug at the firmware boundary experience using oscilloscopes, current<br>probes, and power analyzers to diagnose problems that span firmware control behavior,<br>converter waveform quality, and thermal performance</span></p></li><li><p><span style=\"color:#121317\">Schematic literacy — ability to read power stage schematics (switching FETs, gate<br>drivers, magnetics, snubbers, feedback networks) and understand how firmware<br>interacts with the physical circuit</span></p></li><li><p><span style=\"color:#121317\">Comfortable debugging firmware on real hardware using standard lab tools</span></p></li><li><p><span style=\"color:#121317\">Ability to collaborate closely across hardware, systems, and software teams<br></span></p></li></ul><p><strong><span style=\"color:#121317\">Preferred Qualifications</span></strong></p><ul><li><p><span style=\"color:#121317\">First-principles problem solving a track record of approaching power conversion<br>and charging problems from circuit and control theory fundamentals rather than relying<br>solely on vendor reference designs or digital power controller auto-tuning tools</span></p></li><li><p><span style=\"color:#121317\">EMC and regulatory compliance direct experience with charger or power supply<br>products that required FCC Class B, CE, or equivalent emissions certification.<br>Understanding of how firmware decisions (switching frequency selection, spread-<br>spectrum modulation, burst mode behavior) affect compliance test results.</span></p></li><li><p><span style=\"color:#121317\">EV charging or high-power battery chargers experience at automotive charger<br>suppliers, EVSE manufacturers, or industrial battery charger companies where charge<br>power exceeds 500W and regulatory, thermal, and reliability requirements are<br>demanding</span></p></li><li><p><span style=\"color:#121317\">Consumer electronics power systems experience with UL/IEC 62368-1, IEC 61000<br>series, or similar consumer safety and EMC standards, where the charger must operate<br>safely in a household environment with untrained users</span></p></li><li><p><span style=\"color:#121317\">Power factor correction firmware implementation of active PFC control loops<br>(boost, bridgeless, totem-pole) in firmware, including transient response tuning and THD<br>optimization</span></p></li><li><p><span style=\"color:#121317\">Digital power control experience implementing compensator algorithms (PID, type-<br>II/III) in firmware for voltage and current mode control of switched-mode converters,<br>including discrete-time loop design and stability analysis</span></p></li><li><p><span style=\"color:#121317\">Thermal management firmware experience with firmware-controlled thermal<br>derating, fan speed management, or power limiting based on real-time temperature<br>monitoring of power stage components</span></p></li><li><p><span style=\"color:#121317\">Experience contributing to hardware architecture or system-level design decisions</span></p></li><li><p><span style=\"color:#121317\">Familiarity with real-time operating systems (FreeRTOS, SafeRTOS, or similar)</span></p></li><li><p><span style=\"color:#121317\">Experience supporting hardware through prototype and production phases</span></p></li></ul><p style=\"min-height: 1.7em;\"></p><p style=\"text-align:start;\"><strong><span style=\"color:#121317\">Benefits &amp; Compensation</span></strong></p><ul><li><p><span style=\"color:#121317\">Salary Range: $175,000 - $250,000 + Equity </span></p></li></ul><ul><li><p><span style=\"color:#121317\">Health, dental, and vision insurance</span></p></li><li><p><span style=\"color:#121317\">401(k) with company match</span></p></li><li><p><span style=\"color:#121317\">Paid time off and holidays</span></p></li></ul><p style=\"text-align:start;min-height: 1.7em;\"></p><p style=\"text-align:start;\"><strong><span style=\"color:#121317\">Equal Opportunity Employer</span></strong></p><p style=\"text-align:start;\"><span style=\"color:#121317\">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, or any other characteristic protected under applicable federal, state, or local law.</span></p><p style=\"min-height: 1.7em;\"></p>",
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    "en": {
      "title": "Senior to Staff Firmware Engineer - Battery Charger",
      "highlight": null,
      "description": "<p style=\"text-align:start;\"><strong><span style=\"color:#121317\">About 1X</span></strong></p><p style=\"text-align:start;\"><span style=\"color:#121317\">We’re an AI and robotics company based in San Carlos, California, on a mission to build a truly </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">abundant society through general‑purpose robots capable of performing any kind of work </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">autonomously.</span></p><p style=\"text-align:start;\"><span style=\"color:#121317\"><br>We believe that to truly understand the world and grow in intelligence, humanoid robots must live </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">and learn alongside us. That’s why we’re focused on developing friendly home robots designed to </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">integrate seamlessly into everyday life.<br></span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">We’re looking for curious, driven, and passionate people who want to help shape the future of </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">robotics and AI. If this mission excites you, we’d be thrilled to hear from you and explore how you </span></p><p style=\"text-align:start;\"><span style=\"color:#121317\">might contribute to our journey.</span></p><p style=\"min-height: 1.7em;\"></p><p><strong><span style=\"color:#4F4749\">Role Overview</span></strong></p><p><span style=\"color:#121317\">We are looking for a cross-functional Firmware or Embedded Engineer to develop and maintain<br>the firmware for the battery charging system of a production humanoid robot. In this role, you<br>will own the embedded software that controls AC-DC power conversion, charge profile<br>management, and the interface between the charger and the battery management system.<br></span></p><p><span style=\"color:#121317\">You will work closely with hardware architects, electrical engineers, systems engineers, and test<br>engineers to ensure firmware reliably bridges hardware capabilities and higher-level system<br>requirements across prototype and production platforms.</span></p><p><span style=\"color:#121317\"><br>The charger is a consumer-facing subsystem that must meet regulatory emissions<br>requirements, operate safely in household environments, and manage the charge cycle for a<br>high-energy lithium-ion pack that experiences demanding discharge profiles between charges.<br>Charging behavior directly affects battery longevity, system availability, and user safety. The<br>ideal candidate understands power conversion from magnetics and control loop fundamentals,<br>writes firmware that is robust under component variation and fault conditions, and can reason<br>about the interactions between charger behavior, battery chemistry, and EMC performance.<br></span></p><p><strong><span style=\"color:#121317\">Responsibilities</span></strong></p><ul><li><p><span style=\"color:#121317\">Develop and maintain charger firmware controlling AC-DC power conversion stages,<br>including power factor correction and isolated DC-DC conversion topologies</span></p></li><li><p><span style=\"color:#121317\">Implement charge profile management for multi-series lithium-ion packs: constant-<br>current, constant-voltage, and taper phases with cell-chemistry-appropriate voltage and<br>current limits</span></p></li><li><p><span style=\"color:#121317\">Architect the charger-to-BMS communication interface over CAN or similar embedded<br>bus, coordinating charge current requests, pack voltage feedback, temperature limits,<br>and fault signaling between the two subsystems</span></p></li><li><p><span style=\"color:#121317\">Responsible for the testing, validation, and verification of initial firmware releases to<br>ensure functionality, reliability, and performance requirements are met</span></p></li><li><p><span style=\"color:#121317\">Implement power converter control loops in firmware: voltage regulation, current<br>regulation, and soft-start sequencing with stability under varying line and load conditions</span></p></li><li><p><span style=\"color:#121317\">Develop fault detection and protection firmware: input overvoltage/undervoltage, output<br>overcurrent, overtemperature, ground fault, and loss-of-communication with the BMS,<br>each with defined safe-state transitions</span></p></li><li><p><span style=\"color:#121317\">Support EMC compliance by understanding how firmware-controlled switching<br>frequencies, gate drive timing, and measurement sampling interact with conducted and<br>radiated emissions performance</span></p></li><li><p><span style=\"color:#121317\">Collaborate with hardware architects to define charger hardware requirements, converter<br>topology trade-offs, and the boundary between hardware protection and firmware<br>protection</span></p></li><li><p><span style=\"color:#121317\">Implement production test modes and end-of-line validation routines for charger<br>acceptance, including efficiency measurement, regulation accuracy, and protection trip-<br>point verification</span></p></li><li><p><span style=\"color:#121317\">Develop diagnostic logging and telemetry for charge cycle data, fault history, and<br>component health trending</span></p></li><li><p><span style=\"color:#121317\">Document firmware architecture, interfaces, and assumptions; improve code structure,<br>readability, and maintainability<br></span></p></li></ul><p style=\"min-height: 1.7em;\"></p>",
      "requirements": "<p><strong><span style=\"color:#121317\">Requirements</span></strong></p><ul><li><p><span style=\"color:#121317\">Bachelor’s or Master’s degree in Electrical Engineering, Computer Engineering, or a<br>related field</span></p></li><li><p><span style=\"color:#121317\">7+ years of industry experience with embedded systems and real-time firmware<br>development</span></p></li><li><p><span style=\"color:#121317\">Proficiency in C and C++ for embedded targets</span></p></li><li><p><span style=\"color:#121317\">Production charger or power converter firmware experience the candidate has<br>developed or substantially modified firmware controlling an AC-DC or DC-DC power<br>converter in a shipped product. Experience should include closed-loop regulation,<br>protection logic, and charge profile implementation, not solely integration of a digital<br>power controller evaluation board.</span></p></li><li><p><span style=\"color:#121317\">Power conversion fundamentals working understanding of switched-mode power<br>supply operation: common AC-DC topologies (flyback, LLC, phase-shifted full bridge),<br>power factor correction stages, transformer isolation, and how firmware-controlled<br>parameters (switching frequency, duty cycle, phase shift) affect converter behavior</span></p></li><li><p><span style=\"color:#121317\">Battery charging knowledge — understanding of lithium-ion charge protocols (CC-CV,<br>multi-stage), the relationship between charge rate and cell degradation, and how<br>temperature and cell age affect charge termination criteria</span></p></li><li><p><span style=\"color:#121317\">Embedded bus fluency hands-on CAN implementation for charger-to-BMS<br>coordination, plus additional embedded interfaces (SPI, I²C, UART) for communication<br>with power controller ICs, monitoring devices, and auxiliary circuits</span></p></li><li><p><span style=\"color:#121317\">Hardware debug at the firmware boundary experience using oscilloscopes, current<br>probes, and power analyzers to diagnose problems that span firmware control behavior,<br>converter waveform quality, and thermal performance</span></p></li><li><p><span style=\"color:#121317\">Schematic literacy — ability to read power stage schematics (switching FETs, gate<br>drivers, magnetics, snubbers, feedback networks) and understand how firmware<br>interacts with the physical circuit</span></p></li><li><p><span style=\"color:#121317\">Comfortable debugging firmware on real hardware using standard lab tools</span></p></li><li><p><span style=\"color:#121317\">Ability to collaborate closely across hardware, systems, and software teams<br></span></p></li></ul><p><strong><span style=\"color:#121317\">Preferred Qualifications</span></strong></p><ul><li><p><span style=\"color:#121317\">First-principles problem solving a track record of approaching power conversion<br>and charging problems from circuit and control theory fundamentals rather than relying<br>solely on vendor reference designs or digital power controller auto-tuning tools</span></p></li><li><p><span style=\"color:#121317\">EMC and regulatory compliance direct experience with charger or power supply<br>products that required FCC Class B, CE, or equivalent emissions certification.<br>Understanding of how firmware decisions (switching frequency selection, spread-<br>spectrum modulation, burst mode behavior) affect compliance test results.</span></p></li><li><p><span style=\"color:#121317\">EV charging or high-power battery chargers experience at automotive charger<br>suppliers, EVSE manufacturers, or industrial battery charger companies where charge<br>power exceeds 500W and regulatory, thermal, and reliability requirements are<br>demanding</span></p></li><li><p><span style=\"color:#121317\">Consumer electronics power systems experience with UL/IEC 62368-1, IEC 61000<br>series, or similar consumer safety and EMC standards, where the charger must operate<br>safely in a household environment with untrained users</span></p></li><li><p><span style=\"color:#121317\">Power factor correction firmware implementation of active PFC control loops<br>(boost, bridgeless, totem-pole) in firmware, including transient response tuning and THD<br>optimization</span></p></li><li><p><span style=\"color:#121317\">Digital power control experience implementing compensator algorithms (PID, type-<br>II/III) in firmware for voltage and current mode control of switched-mode converters,<br>including discrete-time loop design and stability analysis</span></p></li><li><p><span style=\"color:#121317\">Thermal management firmware experience with firmware-controlled thermal<br>derating, fan speed management, or power limiting based on real-time temperature<br>monitoring of power stage components</span></p></li><li><p><span style=\"color:#121317\">Experience contributing to hardware architecture or system-level design decisions</span></p></li><li><p><span style=\"color:#121317\">Familiarity with real-time operating systems (FreeRTOS, SafeRTOS, or similar)</span></p></li><li><p><span style=\"color:#121317\">Experience supporting hardware through prototype and production phases</span></p></li></ul><p style=\"min-height: 1.7em;\"></p><p style=\"text-align:start;\"><strong><span style=\"color:#121317\">Benefits &amp; Compensation</span></strong></p><ul><li><p><span style=\"color:#121317\">Salary Range: $175,000 - $250,000 + Equity </span></p></li></ul><ul><li><p><span style=\"color:#121317\">Health, dental, and vision insurance</span></p></li><li><p><span style=\"color:#121317\">401(k) with company match</span></p></li><li><p><span style=\"color:#121317\">Paid time off and holidays</span></p></li></ul><p style=\"text-align:start;min-height: 1.7em;\"></p><p style=\"text-align:start;\"><strong><span style=\"color:#121317\">Equal Opportunity Employer</span></strong></p><p style=\"text-align:start;\"><span style=\"color:#121317\">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, or any other characteristic protected under applicable federal, state, or local law.</span></p><p style=\"min-height: 1.7em;\"></p>",
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  "location_question_visible": false,
  "locations_question_required": true
}