Cell Test Engineer

About ZiplineZipline is the world’s largest and most experienced drone delivery service. We are on a mission to serve all humans equally by ensuring access to food, medicine and essential goods anytime, anywhere. We design, build, and operate the world’s largest autonomous logistics system, delivering critical supplies quickly and reliably. Today, Zipline operates on four continents, makes a delivery somewhere in the world every 30 seconds, and has completed millions of deliveries to date, including blood, vaccines, medical supplies, food, and retail products. Our customers include the world’s largest and most prominent healthcare systems, governments, retailers, restaurants and global businesses who rely on us to save lives, reduce emissions, increase economic opportunity, and provide delivery from point A to point B as fast as possible. The drone is only 15% of what we’ve built to enable seamless, reliable, global operations.Our system strengthens supply chains, reduces congestion, and gives people time back. With more than 140 million commercial autonomous miles safely flown, Zipline is redefining access to healthcare, consumer products, and food across the globe.We operate at a global scale and are looking for practical problem solvers who thrive on real-world challenges and rapid growth. Our team is motivated by building systems that have a direct, meaningful impact on people’s lives and by scaling the future of logistics. We are seeking people who sculpt from first principles, enjoy facing adversity, and can do the impossible at record breaking speeds.About You and The Role Zipline builds autonomous delivery aircraft and ground systems that operate daily in demanding field environments. The performance, reliability, and safety of our aircraft begin at the battery cell. As a Cell Test Engineer, you will develop the test systems, methodologies, and data that characterize cell performance, validate new technologies, and improve the safety and reliability of our battery systems.The Battery & Power Electronics team is responsible for delivering power throughout the aircraft—from individual cells to complete battery packs and power distribution systems. You will design and execute experiments that evaluate electrical performance, thermal behavior, degradation, abuse tolerance, and lifetime across multiple cell technologies, enabling critical engineering and sourcing decisions.This role is open to engineers at all levels. Responsibilities and technical scope will be matched to experience, with opportunities to grow from owning individual test programs to defining cell validation strategy across multiple aircraft platforms.What You'll Do Own end-to-end development of cell validation programs from requirements experiment design execution analysis engineering recommendations continuous improvement.Develop and execute cell characterization programs evaluating capacity, impedance, power capability, efficiency, thermal behavior, and aging performance.Design validation plans covering electrical, thermal, environmental, mechanical, and abuse testing to qualify cells for drone applications.Design experiments that evaluate cycle life, calendar aging, fast charging, temperature performance, storage conditions, and operational limits.Develop custom fixtures, instrumentation, wiring, thermal interfaces, and automation supporting repeatable, high-throughput cell testing.Operate and improve battery cyclers, environmental chambers, thermal measurement systems, DAQ equipment, and laboratory instrumentation.Develop automated test scripts, data processing pipelines, and reporting tools using Python, MATLAB, LabVIEW, or equivalent software.Analyze large experimental datasets to identify degradation mechanisms, performance trends, failure modes, and opportunities for optimization.Perform post-test teardown inspections and correlate electrical performance with mechanical and thermal observations.Support abuse testing including crush, penetration, thermal runaway propagation, overcharge, short circuit, vibration, shock, and environmental exposure.Work closely with battery design, systems engineering, reliability, manufacturing, and suppliers to define validation plans and support product development decisions.Develop laboratory procedures, calibration methods, safety documentation, and standardized test methodologies that improve repeatability and engineering efficiency.Support supplier qualification, incoming cell validation, technology benchmarking, and root cause investigations involving field-return hardware.What You'll BringExperience in battery cell engineering, electrochemical testing, energy storage systems, or validation engineering appropriate to your career level.Experience developing or executing battery cell characterization, life testing, abuse testing, or reliability testing.Strong understanding of lithium-ion battery fundamentals including cell chemistry, degradation mechanisms, thermal behavior, and electrical performance.Experience operating battery cyclers, environmental chambers, DAQ systems, thermal instrumentation, and laboratory equipment.Experience developing automated test software or data analysis tools using Python, MATLAB, LabVIEW, or equivalent platforms.Ability to design experiments using statistical methods and interpret large experimental datasets.Familiarity with battery safety standards and abuse testing methodologies.Experience with instrumentation including thermocouples, RTDs, current and voltage measurement, impedance measurement, and thermal imaging.Strong written and verbal communication skills with the ability to communicate technical findings and influence engineering decisions.What Else You Need To KnowThe starting cash range for this role is $130,000 - $180,000. Please note that this is a target, starting cash range for a candidate who meets the minimum qualifications for this role. The final cash pay for this role will depend on a variety of factors, including a specific candidate's experience, qualifications, skills, working location, and projected impact. The total compensation package for this role may also include: equity compensation; discretionary annual or performance bonuses; sales incentives; benefits such as medical, dental and vision insurance; paid time off; and more.Zipline is an equal opportunity employer and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws or our own sensibilities.We value diversity at Zipline and welcome applications from those who are traditionally underrepresented in tech. If you like the sound of this position but are not sure if you are the perfect fit, please apply!