The Role

We're looking for a Battery Engineer to own the design, development, integration, and qualification of our spacecraft battery systems. You'll be responsible for developing reliable, high-performance energy storage solutions that power the spacecraft through eclipse periods, peak load events, and critical mission operations.

This is a hands‑on individual contributor role for an engineer who enjoys taking battery systems from concept through flight. You'll work closely with power electronics, avionics, thermal, mechanical, and software engineers to develop flight‑ready battery hardware capable of operating safely and reliably in the harsh environment of space.

Responsibilities
- Own the architecture and development of spacecraft batteries from concept through flight qualification
- Design battery packs, module architectures, and electrical interconnects (e.g., laser welding, wire bonding, busbar design) to meet mission performance requirements, including series/parallel cell configuration trade‑offs
- Develop a battery management system (BMS),



including cell balancing (passive and active balancing techniques), state‑of‑charge (SOC) and state‑of‑health (SOH) estimation (coulomb counting, OCV‑based, and model‑based/Kalman filtering approaches), fault detection, and protection strategies (overvoltage, undervoltage, overcurrent, overtemperature, cell imbalance)
- Select battery cell chemistries and components (e.g., NMC, NCA, LFP, or primary Li‑CFx for long‑duration/low‑power missions) based on mission requirements, specific energy/power trade‑offs, cycle life, reliability, and environmental constraints
- Perform battery sizing, capacity analysis, degradation modeling (capacity fade, impedance growth), depth‑of‑discharge (DoD) management for cycle life targets, and lifecycle assessments
- Develop battery charging and discharge strategies in partnership with the spacecraft power systems team, including coordination with solar array power management (MPPT vs. di

📌 Sr. Battery Engineer (San Carlos)
🏢 Cowboy Space
📍 San Carlos