Staff Software Engineer: Embedded Power Systems & Functional Safety

OUR MISSION SPAN IS ENABLING ELECTRIFICATION FOR ALL ⚡ WE ARE A MISSION-DRIVEN COMPANY DESIGNING, BUILDING, AND DEPLOYING PRODUCTS THAT ELECTRIFY THE BUILT ENVIRONMENT, REDUCE CARBON EMISSIONS, AND SLOW THE EFFECTS OF CLIMATE CHANGE. - Decarbonization is the process to reduce or remove greenhouse gas emissions, especially carbon dioxide, from entering our atmosphere. - Electrification is the process of replacing fossil fuel appliances that run on gas or oil with all-electric upgrades for a cleaner way to power our lives. AT SPAN, WE BELIEVE IN: - Enabling homes and vehicles powered by clean energy - Making electrification upgrades possible - Building more resilient homes with reliable backup - Designing a flexible and distributed electrical grid THE ROLE SPAN's Device Software team is responsible for all of the software that is physically embodied in our hardware products. The SPAN Panel is a safety-critical electrical device at the heart of the home energy system; our software directly governs how power flows, how faults are detected and responded to, and how the system remains safe under all conditions. We seek collaborative, top-tier engineers who excel at solving complex problems alongside their peers. Our culture is rooted in strong support and a deep trust in our team's capabilities. Engineers work directly with the broader software, product, and hardware teams to ensure the right things get built at the right time. RESPONSIBILITIES As a Staff Engineer on the Device Software team you will own the design and implementation of the control algorithms and functional safety architecture that govern how the SPAN Panel manages electrical power. This means designing real-time control systems and algorithms, owning the full functional safety lifecycle for software components (including hazard analysis, FTA, SW-FMEA, and certification artifacts), and setting the engineering standard for how we build safe, reliable power control software. You will drive safety-critical features from conception through implementation and certification, working independently and influencing the broader team and organization. Representative Projects - Designing and implementing control algorithms for power management (including load shedding logic, relay actuation sequencing, and fault response state machines) running on MCUs in an RTOS environment, working with system architects to define requirements and validate behavior across operating conditions. - Owning the functional safety software lifecycle for new features: authoring hazard analyses and software FMEAs, designing safety mechanisms and diagnostics into firmware, and producing the documentation and evidence packages required for UL 1998, UL 60730, and UL 3141 certification. - Developing fault injection frameworks and Hardware In the Loop test methodologies that validate safety mechanisms across bench and system-level test environments, and evangelizing functional safety best practices across the Device Software team and partner teams. ABOUT YOU Required Qualifications We are seeking a Staff Embedded engineer with: - Deep knowledge of electrical power systems, including power conversion, load control, energy metering, the behavior of switching systems, and the ability to translate that domain knowledge into correct, safe embedded software - Experience designing and implementing real-time control algorithms on microcontrollers, including PID controllers, state machine-based control systems, and timing-critical software in RTOS environments - Hands-on functional safety process experience with UL 1998, UL 60730, and/or UL 3141 (or an equivalent standard such as IEC 61508 or ISO 26262), including safety analysis techniques such as FTA and SW-FMEA - 7 or more years of experience writing embedded software for hardware devices in C++ or object-oriented C on microcontrollers - Strong fundamentals in modern software design: object-oriented design, manual memory management, and real-time constraints - E