Role & seniority: Test Engineer, mid to senior level (early-stage engineering team member)

Stack/tools: mechanical, electrical, software collaboration; high-voltage systems (400–2000 VDC, 480–800 VAC); manufacturing & field testers; test automation, self-test, data analysis; GRR/SAT; battery testers/characterization tools

Top 3 responsibilities

Design, implement, and validate manufacturing and field testers for a new electromechanical product
Collaborate with firmware/hardware teams to define test coverage, metrics, and manufacturing testing features; lead tester builds and validation (GRR, SAT)
Debug root-cause issues in manufacturing tests and develop scalable test infrastructure and automation

Must-have skills

Bachelor’s in Mechanical, Electrical, Mechatronics, or related field; 5+ years in manufacturing/test engineering or similar
Experience with high-voltage systems; cross-disciplinary comfort (mechanical, electrical, software)
Background in high-volume manufacturing; direct battery tester or characterization tools
Ability to develop scalable tools/infrastructure; strong communication with stakeholders

Nice-to-haves

Experience leading tester builds/validation programs; proficiency in test automation and data analysis
Prior work in battery-related testing environments; broader software/firmware collaboration
Location & work type: California-based, full-time position; occasional travel; potential for weekends/nights/on-cal

Full Description

About Redwood Materials Redwood is localizing a global battery supply chain that seamlessly integrates recovery, reuse, and recycling — keeping critical minerals in circulation and driving the energy transition. Founded in 2019, we’re delivering low-cost and large-scale energy storage and producing battery materials in the U.S. for the first time, all from batteries we already have. Test Engineer, Energy Storage

Essential Duties

As an early member of a new engineering team, you will play a key role in designing testers to support the development of a new product at Redwood Materials. Your responsibilities will span across mechanical, electrical, and software engineering domains to ensure robust product validation. You’ll be involved in the design of testers for implementation in manufacturing as well as field settings to screen our products. This role requires a hands-on, proactive attitude paired with a methodical and analytical approach to problem-solving.
If necessary, we will adjust the job level to suit your experience and responsibilities.

Responsibilities will include

Develop and implement manufacturing & field testers for a new electromechanical product
Collaborate with firmware and hardware teams to develop test coverage, define metrics, align on hardware and firmware features for manufacturing testing implementation
Debug and root cause issues found in manufacturing test
Design and develop manufacturing test hardware that may include functional and system power tests
Lead tester builds and validation efforts such as GRR and SAT
Work with firmware & software teams to develop test automation, self-test, and data analysis

Desired Qualifications

Bachelor's degree in Mechanical Engineering, Electrical Engineering, Mechatronics, or a related field
5+ years of technical experience in manufacturing test engineering or a related role
Experience working with high-voltage systems (400–2000VDC and 480-800VAC)
Deep technical expertise in at least one aspect of test engineering, with comfort working across disciplines (mechanical, electrical, software)
Experience working in a high volume manufacturing environment
Direct experience with battery testers or characterization tools
Experience developing scalable tools, infrastructure, and design practices for test engineering teams
Excellent communication and interpersonal skills; ability to engage effectively with stakeholders at all organizational levels, including executives
A get-it-done attitude; no job is too big or too small

Test Engineer, Energy Storage