Lead BMS Design BESS

Lead BMS System Engineer – Stationary Energy Storage (BESS)About the Role

We are seeking a Lead BMS System Engineer to drive the architecture, design, and validation of Battery Management Systems (BMS) for commercial and utilityscale stationary Battery Energy Storage Systems (BESS).

In this role, you will own the endtoend BMS system lifecycle—from requirements definition and system architecture to validation, field deployment, and continuous improvement. You will act as the technical authority for BMS within the BESS platform, mentoring engineers and collaborating closely with power electronics (PCS), EMS, grid integration, and validation teams.

This position demands strong systemlevel thinking, deep BMS expertise, and technical leadership to ensure safety, scalability, reliability, and longterm performance of fielddeployed energy storage assets.

Key ResponsibilitiesTechnical Leadership & Ownership

• Act as technical lead and subjectmatter expert (SME) for BMS architecture in stationary BESS products.
• Own systemlevel BMS requirements, interfaces, and design decisions.
• Review and approve BMS designs, algorithms, and implementation from junior engineers.
• Mentor and technically guide engineers across firmware, validation, and system integration.
  
  

BESS Controller & System Design

• Lead the design and development of BESS controller architecture, coordinating BMS, PCS, EMS, and SCADA interfaces.
• Define systemlevel control strategies for longduration, highcapacity battery systems.
• Ensure scalability across multirack, containerized, and MW/MWhscale deployments.
  
  

BMS Firmware & Algorithms

• Architect and guide development of RTOSbased BMS firmware (C / C++).
• Lead implementation and tuning of advanced BMS features:
• Cell and module monitoring
• Passive and active cell balancing algorithms
• Protection, derating, and control logic
• Ensure firmware follows safetycritical and reliabilityfocused design practices.

Communication & Integration

• Define and govern communication architectures:
• CAN / CAN FD for internal BESS communication
• Modbus RTU / TCP for EMS, PCS, and SCADA
• Own interface specifications and sequencing between BMS, PCS, and EMS.
• Support gridinterface and system commissioning requirements.

Validation, Safety & HIL

• Lead HIL (HardwareintheLoop) strategy and execution for BMS and systemlevel validation.
• Define test coverage for:
• Normal and edgecase operation
• Gridrelevant fault and abuse scenarios
• Architect and tune diagnostics and protection strategies for:
• Electrical faults (over/under voltage, current)
• Thermal faults
• Insulation resistance and communication failures
• Ensure compliance with relevant stationary storage safety and reliability standards.

OTA, Cybersecurity & Field Reliability

• Architect secure OTA firmware update frameworks for longlife, fielddeployed BESS.
• Ensure robustness, failsafe operation, and rollback strategies.
• Drive cybersecurity awareness for connected energy systems.
  
  

Product Lifecycle & Field Support

• Lead technical support for:
• Factory Acceptance Testing (FAT)
• Site Acceptance Testing (SAT)
• Commissioning and deployments
• Perform systemlevel root cause analysis (RCA) of field issues.
• Feed lessons learned into design, firmware, and validation improvements.
• Own technical documentation, system specifications, and validation reports.

Required Skills & ExperienceCore Technical Expertise

• 12–15 years of experience in BMS, embedded systems, or energy storage product development.
• Strong handson expertise in:
• RTOSbased embedded firmware (C / C++)
• CAN / CAN FD / Modbus communication
• Cell balancing algorithms and SOC/SOHrelated considerations
• HIL validation and fault diagnostics
• Experience with microcontrollers and BMS ICs used in stationary storage systems.
• Deep understanding of Liion battery electrothermal behavior, aging, and safety limits.
• Proficiency with embedded debugging tools (JTAG, CAN tools, logic analyzers).
• Experience working with Git and structured product development processes.

System & Product Experience

• Proven experience delivering stationary BESS products (C&I or utilityscale preferred).
• Strong understanding of BMS–PCS–EMS interaction at system level.
• Familiarity with gridrelevant operating and fault scenarios in stationary storage.
• Exposure to highvoltage battery systems.
  
  

Preferred Qualifications

• Bachelor's or Master's degree in Electrical, Electronics, Embedded Systems, or related field.
• Knowledge of IEC / UL standards applicable to stationary energy storage.
• Exposure to functional safety concepts and safetycritical design.
• Awareness of cybersecurity requirements for OTA and connected infrastructure assets.
  
  

Soft Skills & Leadership Expectations

• Strong systemlevel and architectural thinking.
• Ability to lead technically while remaining handson.
• Excellent crossfunctional communication with firmware, hardware, validation, EMS, and power electronics teams.
• High sense of ownership, safety, and product reliability.
• Comfortable making design tradeoffs under schedule and field constraints.