Senior Battery Engineer

Senior Battery Engineer (Full-Time) – Boston, MA

Lead the design, qualification, and lifecycle sustainment of lithium‑ion battery systems that power WHOOP’s advanced wearable technology.

• Critical role in achieving the highest levels of energy density, reliability, and safety in compact, high‑performance form factors.
• Act as technical lead for battery systems, driving development across internal engineering teams and external partners.
• Drive innovation in cell design and integration to support long‑lasting, compact energy systems that meet WHOOP’s demanding performance standards.
• Own the battery subsystem and ensure optimal reliability and safety under real‑world use conditions.
• Collaborate with electrical, mechanical, firmware, reliability, and quality engineers to optimize battery system performance in a multidisciplinary development environment.
• Lead the creation and execution of test plans, including Design of Experiments (DOE), performance validation, and root‑cause failure analysis for battery‑related issues.
• Evaluate and qualify battery suppliers and manufacturing partners, ensuring alignment with WHOOP’s product standards and regulatory requirements.
• Maintain organized documentation for test results, field performance data, and compliance with international safety and regulatory standards (UL, CE, IEC).
• Ensure WHOOP’s battery systems meet or exceed global safety and certification benchmarks, supporting regulatory filings as needed.
• Conduct field quality assessments and lead corrective actions for battery‑related concerns.
• Mentor junior engineers and contribute to technical roadmaps for future product innovation.
• Manage battery subsystem development timelines and cross‑functional team coordination to ensure on‑time delivery of new and sustained battery technologies.
• Work with firmware and electrical engineers to develop and optimize the fuel gauge and battery management system for the WHOOP line of products.

• Bachelor’s degree in Chemical, Mechanical, or Electrical Engineering, or related technical field (or foreign degree equivalent) and 5 years of experience with battery system design, failure analysis, or sustaining engineering.
• Or Master’s degree in Chemical, Mechanical, or Electrical Engineering, or related technical field (or foreign degree equivalent) and 2 years of experience with battery system design, failure analysis, or sustaining engineering.
• At least 2 years of experience with Lithium‑Ion Cell design and battery chemistry.
• At least 2 years of experience leading cross‑functional engineering projects and communicating complex technical issues to diverse stakeholders.
• At least 2 years of experience using Python or similar scripting tools for test data analysis and visualization.
• At least 2 years of experience with machine learning methods and data science tools for battery predictive modeling.
• At least 2 years of experience with running battery test equipment (Arbin or Maccor) and battery test fixture/DOE development.

$146,786/year – $185,000/year