Freelance Mechanical Reliability Engineer Jobs in Appleton, WI

You've discovered something special. A company that cares. Cares about leading the way in construction, engineering, manufacturing and renewable energy. Cares about redefining how energy is designed, applied and consumed. Cares about thoughtfully growing to meet market demands. And as "one of the Healthiest 100 Workplaces in America" is focused on the mind/body/soul of team members through our Culture of Care.

Faith Technologies Inc. (FTI) is searching for a Senior Battery Systems Engineer to join our R&D organization and drive innovation in stationary energy storage solutions for our Product Engineering team located in either Phoenix, AZ or Menasha, WI. This role will focus on the design, development, and validation of advanced battery systems for UPS, C&I, and BESS applications. You will lead system-level testing, create validation plans, and collaborate across disciplines to ensure performance, reliability, and safety of integrated battery systems.

About the Product Engineering Team

Our ProductEngineeringTeam sits at the intersection of innovation and execution, transforming ideas into real-world products and solutions for Excellerate Products(tm), a division of Faith Technologies Incorporated (FTI). From early concept through full-scale production, our engineers design Data Center power distribution products, Electric Vehicle chargingskids, switchboards and more! With a strong focus on quality, manufacturability, and customer outcomes, we ensureeveryproduct is engineered to perform in the real world-safely, reliably, and at scale.

To learn more about our products and services, visit our website: Excellerate Products - Smarter Power Solutions - FTI.

MINIMUM REQUIREMENTS

• Bachelor's degree in electrical, Mechanical, Chemical, or related engineering discipline.
• 5+ years of experience in battery system design, architecture, testing, or integration for stationary applications (UPS, BESS, C&I).
• Strong knowledge of lithium-ion chemistries, battery architectures, and failure modes.
• Hands-on experience with battery testing and validation protocols.
• Familiarity with compliance standards and safety regulations for stationary battery systems.
• Excellent communication skills for cross-functional collaboration and stakeholder engagement.
• Strong communication skills to provide clear recommendations and guidelines to stakeholders, technical development teams, and testing teams

PREFFERED REQUIREMENTS

• Master's degree in electrical, Mechanical, or Chemical Engineering.
• Experience with DFMEA, root cause analysis, and reliability engineering.
• Knowledge of aging analysis, end-of-life behavior, and thermal management strategies.
• Experience with performance modeling tools (MATLAB/Simulink, Simscape) and FEA/CFD for thermal and structural analysis.

Travel: 5-10%

Work Schedule: This position works between the hours of 7 AM and 5 PM, Monday- Friday. However, work may be performed at any time on any day of the week to meet business needs.

Work Location: This role requires work to be done Onsite from our Menasha, WI or Phoenix, AZ office. Our onsite roles include a high level of workplace and schedule flexibility to support a healthy work-life balance.

KEY RESPONSIBILITIES

• Participate in system-level testing of integrated battery systems for UPS, microgrid, EV charging, and data center applications.
• Develop test plans and protocols to validate battery performance, life, and reliability at cell, module, and pack levels.
• Conduct and document DFMEA and failure mode analysis for battery systems.
• Define system-level requirements for size, performance, cost, and compliance for stationary battery systems.
• Maintain technical documentation, including specifications, selection analysis, and simulation reports.
• Collaborate with simulation, thermal, and mechanical engineers to define modeling requirements and validate battery architectures.
• Partner with controls and software teams to establish guidelines for BMS design and integration.
• Evaluate and benchmark new chemistries and competitive technologies to ensure best-in-class performance.
• Support verification and validation activities by defining DVP&R for battery system testing.
• Ensure compliance with industry standards (UL 9540A, UL 1973) and lead risk assessments for product safety.

The job description and responsibilities described are intended to provide guidelines for job expectations and the employee's ability to perform the position described. It is not intended to be construed as an exhaustive list of all functions, responsibilities, skills, and abilities. Additional functions and requirements may be assigned by supervisors as deemed appropriate.

Applicants must be authorized to work for ANY employer in the U.S. We are unable to sponsor or take over sponsorship of an employment Visa at this time other than the TN1 Visa (Canadian).

#Onsite

How Does FTI Give YOU the Chance to Thrive?

If you're energized by new challenges, FTI provides you with many opportunities. Joining FTI opens doors to redefine what's possible for your future.

Once you're a team member, you're supported and provided with the knowledge and resources to achieve your career goals with FTI. You're officially in the driver's seat of your career, and FTI's career development and continued education programs give you opportunities to position yourself for success.

FTI is a "merit to the core" organization. We recognize and reward top performers, offering competitive, merit-based compensation, career path development and a flexible and robust benefits package.

Benefits are the Game-Changer

We provide industry-leading benefits as an investment in the lives of team members and their families.You're invited to review the full list of FTI benefits available to regular/full-time team members. Start here. Grow here. Succeed here. If you're ready to learn more about your career with FTI, apply today!

Faith Technologies, Inc. is an Equal Opportunity Employer - veterans/disabled.