Requisition Number: XL2026-006

Position : Chemical Process 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 Chemical Process 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).

Role Description

The Chemical Process Engineer is a full-time, on-site role based in Marlborough, MA, responsible for developing, optimizing, and scaling chemical processes for XL Batteries' Organic Flow Battery™ systems. Day-to-day tasks include designing and modeling process flows, specifying equipment, and conducting experiments and pilot-scale trials to validate process & battery performance. The role involves monitoring and improving process control strategies, analyzing data to identify efficiencies, and implementing changes that enhance safety, quality, and cost-effectiveness. The engineer collaborates closely with R&D, manufacturing, and operations teams to transfer new chemistries into production and troubleshoot issues in existing processes. Responsibilities also include preparing technical documentation, supporting regulatory and safety compliance, and contributing to continuous improvement initiatives in a dynamic startup environment.

Required Skills & Experience

• Strong foundation in Chemical Process Engineering and Process Engineering, with experience in industrial or pilot-scale environments.
• Background in the Chemical Industry or closely related fields, ideally involving electrochemical systems, batteries, or energy storage
• Demonstrated success scaling processes from lab/pilot to commercial scale.
• Strong command of PFDs, P&IDs, mass/energy balances, control strategies, HAZOP, and regulatory documentation.
• Track record delivering plants or major process units safely, on schedule, and on budget.
• Excellent cross-functional communication, documentation, and project leadership
• Skills in Process Design, including flowsheet development, equipment specification, and scale-up from lab to production
• Hands-on lab or plant experience, including experimental design, process scale-up & optimization, troubleshooting, and root-cause analysis.
• Knowledge of safety, environmental, and regulatory standards relevant to chemical processing.

Preferred Qualifications

• 5+years Bachelor's or Master's degree in Chemical Engineering or a closely related engineering discipline.
• Proficiency in process simulation and data analysis tools (e.g., Aspen, MATLAB, Python, or similar software) and experience using AI tools to accelerate technical documentation
• Ability to work on-site in Marlborough, MA, collaborate in cross-functional teams, 'go-to-market' partners
• Experience managing and communicating effectively with 'go-to-market' partners, engineering firms and ability to communicate complex technical & engineering concepts clearly.
• Experience in startup or fast-paced environments and an interest in sustainable energy technologies is a plus.
• Travel: 20-25%

Compensation & Benefits

We offer competitive salary (+equity) and benefits, including healthcare, dental, vision, and a retirement plan

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Application Process

Apply through xl-batteries.breezy.hr