Job Description

Senior Battery Engineer (Full-Time)

Boston, MA

Duties:

Lead the design, qualification, and lifecycle sustainment of lithium-ion battery systems that

power WHOOP’s advanced wearable technology. This role is critical to achieving the highest

levels of energy density, reliability, and safety in compact, high-performance form factors. Serve

as the technical lead for WHOOP’s 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 batteries 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.

Requirements:

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. Will also accept a 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. Required

Skills: 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.

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