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About the Role

Redwood Materials is seeking a deeply technical, hands-on Battery Software & Controls Integration Engineer to architect the future of grid-scale energy storage. This role involves integrating diverse second-life automotive batteries into a unified Battery Energy Storage System (BESS), requiring expertise in electrochemistry, embedded BMS firmware, and high-voltage pack hardware. You will be responsible for bringing up battery packs, reverse-engineering BMS architectures, validating algorithms, and integrating Redwood’s in-house control algorithms to optimize performance and safety. You will also act as the technical liaison with automotive OEMs.

Responsibilities

Lead physical benchtop and lab bring-up of diverse second-life EV battery packs.
Probe wiring harnesses, capture and decode proprietary CAN/CAN-FD/LIN/Ethernet traffic, spoof vehicle-level signals, and command pre-charge and main contactor sequencing.
Design and execute hardware and HIL test campaigns to audit native OEM BMS algorithms under stationary grid duty cycles.
Validate accuracy of existing BMS state estimations (SoC, SoH, SoP, etc.) against electrochemical and thermal performance.
Implement and integrate Redwood’s proprietary battery state-estimation, degradation-mitigation, and active balancing/derating algorithms.
Architect and deploy resilient, low-latency software abstraction layers and translation gateways on embedded targets.
Serve as the primary technical counterpart to external automotive OEMs and Tier-1 BMS suppliers.
Drive engineering reviews to negotiate custom BMS firmware builds and establish deterministic command hooks.
Partner with validation and power electronics teams to model pack dynamics and verify functional safety boundaries.

Requirements

MS, or PhD in Electrical Engineering, Computer Engineering, Chemical/Electrochemical Engineering, or a related field.
5+ years of hands-on experience in BMS firmware/controls development, battery pack bring-up, or EV/BESS battery integration.
Deep, practical understanding of lithium-ion battery physics, equivalent circuit modeling, Kalman filtering, Coulomb counting, cell balancing topologies, and high-voltage safety architecture.
Proven ability to bring up an undocumented or partially documented battery pack.
Expert proficiency with oscilloscopes, logic analyzers, CANalyzer/CANoe/busmaster, high-voltage power supplies/cyclers, and diagnostic protocols.
Strong programming proficiency in Rust and C/C++ within real-time embedded and Linux environments.
Experience with data analysis and modeling tools (MATLAB/Simulink, Pandas/SciPy).
Demonstrated success acting as the lead technical point of contact with external OEM engineering teams.

Skills

BMS firmware/controls development
Battery pack bring-up
EV/BESS battery integration
Lithium-ion battery physics
Equivalent circuit modeling (ECM)
Kalman filtering (EKF/UKF)
Coulomb counting
Dynamic power/current limit calculation
Cell balancing topologies
High-voltage safety architecture (HVIL, isolation monitoring, contactor weld detection, pyro-fuses)
Oscilloscopes
Logic analyzers
CANalyzer/CANoe/busmaster
High-voltage power supplies/cyclers
Diagnostic protocols (UDS, CCP/XCP, J1939, CAN/CAN-FD, Automotive Ethernet, Modbus)
Rust
C/C++
Real-time embedded systems
Linux environments
MATLAB/Simulink
Pandas/SciPy
OEM technical liaison

Location

San Francisco

Work Type

Onsite
Full-time

Experience Level

5+ years of hands-on experience

Education Level

MS or PhD in Electrical Engineering, Computer Engineering, Chemical/Electrochemical Engineering, or a related field

Salary/Compensations

$152,000—$287,000 USD

About the Company

Redwood Materials was founded in 2017 by JB Straubel, co-founder and former CTO of Tesla.
The company's mission is to recover, refine, and redeploy critical minerals from end-of-life batteries back into the supply chain.
Redwood is the largest lithium-ion battery recycler in North America.
They have deployed the largest second-life battery project in the world, delivering power to AI data centers.
The company is profitable and operates in a market projected to grow significantly.
Redwood is positioned to lead the industry due to its supply chain, technology, and operational scale.