Senior Embedded Engineer (Battery-management)

Combined Selection Group Ltd; California (MO); On-site; USD 155,000 - 221,000; Full time

Job summary

Combined Selection Group Ltd is seeking a Senior Embedded Software Engineer to own the embedded software for a new MCU-based battery subsystem in a fast-growing, engineering-focused environment in Long Beach, California.

You will develop bare-metal and RTOS firmware for a battery-management system, implement state estimation tasks, and collaborate with electrical and power-electronics engineers to bring up boards and support field testing.

Qualifications

• Approximately five or more years of embedded-software experience preferred.
• Deep expertise in bare-metal or RTOS MCU development for real hardware.
• Strong proficiency in C or C++.
• Experience with battery-management, energy-storage or related embedded systems.
• Knowledge of cell monitoring, protection, state estimation and fault handling.
• Ability to work independently while collaborating across engineering teams.

Responsibilities

• Own the battery-management software subsystem from requirements through production-ready implementation.
• Develop bare-metal and RTOS-based firmware for MCU-based BMS.
• Create MCU board-support packages, drivers and interfaces.
• Implement state-of-charge and state-of-health estimation functionality.
• Design deterministic RTOS software under strict latency and memory constraints.
• Bring up new boards with electrical and power-electronics engineers.
• Read schematics, review hardware interfaces and diagnose integration issues.
• Develop unit, integration, and hardware-in-the-loop tests with test engineering.
• Support laboratory and field testing and continuous improvements.

Skills

Embedded C/C++

RTOS development

Microcontrollers

Battery management

Diagnostics

Hardware bring-up

Job description

Senior Embedded Software Engineer - Battery Management Systems

Location: Long Beach, California (On-site)

Employment type: Full time

Compensation: $155,000-$221,000, plus equity and benefits

Position overview

Our client is an engineering-led technology company developing advanced embedded systems for demanding, high-reliability environments. They are seeking an experienced battery-management firmware engineer to own the embedded software for a new microcontroller-based battery subsystem. The role spans cell monitoring, communications, control and protection interfaces, state estimation, sequencing, limits, diagnostics, fault handling and integration with power electronics. This is a hands-on individual-contributor position with end-to-end technical ownership, from early requirements and architecture through hardware bring-up, verification, field support and continued improvement. You will work closely with embedded, electrical, power-electronics and test engineers throughout development and integration.

• Responsibilities Own the battery-management software subsystem from initial requirements and architecture through production-ready implementation and ongoing support.
• Develop bare-metal and/or RTOS-based firmware for a microcontroller-based battery-management system.
• Create and maintain MCU board-support packages, low-level drivers and peripheral interfaces.
• Implement cell-monitoring, communications, control and protection interfaces.
• Develop battery-management state machines, operating modes, fault handling, safe states and recovery behaviour.
• Implement state-of-charge and state-of-health estimation functionality.
• Develop monitoring, balancing, sequencing, limits, thermal supervision, diagnostics and protection logic.
• Integrate battery-management firmware with power electronics, communications interfaces and higher-level system controls.
• Design deterministic real-time software under strict latency, jitter, timing, memory and compute constraints.
• Configure and debug MCU peripherals including timers, ADCs, interrupts, DMA, non-volatile memory and communication interfaces.
• Bring up new boards in close collaboration with electrical and power-electronics engineers.
• Read schematics and component documentation, review hardware interfaces and diagnose hardware/software integration issues.
• Use oscilloscopes, logic analysers, in-circuit debuggers and related laboratory tools to identify root causes.
• Develop unit, integration, software-in-the-loop, hardware-in-the-loop and fault-injection tests in collaboration with test engineering.
• Support laboratory and field testing, production testing, failure investigation and corrective improvements.
• Improve build automation, continuous integration, static analysis, profiling and automated testing.
• Produce concise engineering documentation, contribute to technical reviews and mentor other engineers while remaining hands-on.

Required qualifications

• Approximately five or more years of relevant embedded-software experience is preferred; demonstrated technical depth and delivery experience are more important than a specific tenure.
• Deep practical expertise in bare-metal and/or RTOS-based microcontroller development for real hardware systems.
• Strong proficiency in at least one low-level systems-programming language, such as C or C++.
• Practical experience developing software for battery-management, energy-storage, power-electronics or a closely related embedded system.
• Strong understanding of cell monitoring, battery protection, sequencing, limits, diagnostics, fault handling and safe-state design.
• Experience with battery state estimation, including state of charge and/or state of health.
• Experience implementing deterministic software under latency, jitter, timing, memory and performance constraints.
• Strong understanding of timers, interrupts, DMA, concurrency, synchronisation, memory management and low-level peripheral control.
• Experience bringing up new MCU boards, reading schematics and debugging integrated hardware/software systems.
• Experience with common embedded communication protocols and bus architectures.
• Strong laboratory-debugging skills using oscilloscopes, logic analysers and related equipment.
• Experience writing maintainable production code, conducting code reviews, developing automated tests, using static analysis and profiling performance.
• Ability to work independently with incomplete information while collaborating closely across engineering disciplines.
• Willingness to support field testing when required.
• US citizenship and eligibility to obtain and maintain a U.S. security clearance.

Desirable experience

• Safety-critical, mission-critical or other high-reliability embedded products
• Taking a greenfield battery-management system through design, verification and operational deployment
• Cell monitoring and balancing
• State-of-charge and state-of-health estimation
• Thermal monitoring, charge/discharge limits and fault-state design
• Power-electronics integration and high-voltage safety concepts
• Experience across multiple MCU and RTOS platforms
• Fault injection, HOOTL, SIL, HIL or HITL test environments
• Robotics, aerospace, automotive, industrial-control, medical, energy or similarly integrated electromechanical systems

Keywords: Senior Embedded Software Engineer, Battery Management System, BMS, Embedded C, C++, Bare Metal, RTOS, Microcontrollers, State of Charge, State of Health, Cell Monitoring, Battery Protection, Power Electronics, Board Bring-Up, HIL Testing and High-Reliability Systems