Requisition Number:  XL2025-002

Position:  Stack Prototype Engineer

Location:  Marlborough, MA

About Us

XL Batteries, a Massachusetts-based development stage company focused on long duration energy storage at the grid level.  We are growing a highly collaborative team with the addition of a Principal Battery Systems Engineer. Our mission is to create a safe, low-cost and reliable grid-scale battery that will enable the transition of the grid from fossil fuels to renewable sources.   We are a fast paced, nimble startup where no job is too big or small, and where we strive to ask ourselves the hard questions before problems arise.

XL Batteries is an equal opportunity employer

About Our Location

Marlborough, MA is a beautiful small city in central Massachusetts, surrounded by quaint  Massachusetts towns and within a day-trip distance of the Berkshires, White Mountains, and Cape Cod. For those who prefer a more urban lifestyle, we are located directly off I-495 within  easy commuting distance of Boston and Cambridge (30-40 minutes), Worcester (25 minutes),  Nashua, NH (45 minutes) and Providence, RI (50 minutes). 

About You

We are seeking talented engineers, machinists and makers with a proven track record who are looking to develop an industry-leading storage technology. We are looking for teammates who are collaborative and creative.

Each team member has an opportunity to truly impact XL Batteries, and with that mentality we need team members that are excited to work in a fast paced startup environment that is ever changing, where no job is too big or too small, and where we strive to constantly learn and grow.

Responsibilities

• Manage a prototype machine shop where you will operate and guide others in operating prototyping equipment safely and efficiently (3D printers, CNC routers, laser cutters, basic workshop power tools, etc.).

• Manage the safety and cleanliness of the prototyping machine shop.

• Recommend tooling and equipment to improve producibility of stack designs.

• Prototype and assemble electrochemical components and cells to support testing objectives.

• Ability to identify and resolve technical issues with equipment as well as manufactured parts.

• Recommend design changes to improve manufacturability of stack components and assembly of stack components.

• Record appropriate data, analyze, and report the results to a cross-functional team.

• Generate SOPs and guide team mates in meeting SOP requirements.

• Own and meet milestones using Objectives and Key Results (OKRs).

Qualifications

Required

• B.S. in Mechanical, Electrical Engineering or related fields or B.A. in same with production experience.

• Fundamental knowledge of electrochemistry, thermodynamics, fluid dynamics, heat & mass transfer, chemical kinetics, and materials.

• Electrochemical engineering development experience in a relevant field such as fuel cell, electrolyzer, and flow battery.

• Ability to think critically.

• Mechanically inclined.

• Execution/results-oriented mindset.

• Hands on experience running 3D prototyping technologies (e.g., CNC, 3D printers).

• Demonstrated experience using various CAD software tools.

• Ability to develop code to run machine shop equipment and 3D printers from CAD generated designs.

•  A “maker’s mindset”: comfortable bringing ideas quickly from paper to prototype.

• The ability to adapt quickly to changing processes and responsibilities

• Excellent interpersonal and communication skills.

• A safety-first mindset; share potential risks with others before they result in hazardous outcomes.

• Highly motivated and self-driven with the ability to work independently.

• The ability to set priorities while juggling multiple tasks.

• Strong written and oral communication skills required.

• Must be comfortable lifting heavy objects.

• Must have legal authorization to work in the United States.

Preferred

• 5+ years working in a prototyping environment

• Experience with lean manufacturing techniques

• Experience with Solid Works

Compensation & Benefits

• We offer competitive salary and benefits,  including healthcare, dental, vision, and a retirement plan.

Application Process

• Apply through xl-batteries.breezy.hr