Senior Mechanical Engineer, Unit Cell R&D

Invinity Energy Systems Plc
Invinity Energy Systems Plc

Other Engineering

Vancouver, BC, Canada

CAD 120k-135k / year

Posted on Jun 20, 2026
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Energy storage is the most exciting area in energy today. Massive amounts of energy storage are required if renewable energy is to take its rightful place on the electric grid. Invinity provides an alternative to the most common type of battery, lithium-ion because the battery technology that works so well in our pockets doesn’t work as well at the grid scale; it wears out, limits use, and even catches fire.

Manufactured as a standardized product in a factory, Invinity’s vanadium flow batteries don’t degrade, won’t catch fire, and can be operated continuously from full charge to full discharge for 25 years. Invinity has 75,000 kilowatt-hours of its modular battery systems in 82 projects across 15 countries - more than any other company in the space. We’ve deployed the largest flow battery systems in the U.S., Canada, Australia, and the UK, and are supported by the UK Infrastructure Bank, the U.S. Department of Energy, and some of the world’s leading institutional investors.

A compelling product and recent funding put Invinity in a position to grow dramatically as it addresses the global imperative for stationary energy storage. Join us as we help transform renewable energy into a stable and dependable contributor to the transition to net zero.

Invinity has operations in the UK, Canada, the U.S., Australia, and China and trades publicly in the UK on AIM and AQSE and in the U.S. on OTCQX. For more information about us visit our webpage.

SENIOR MECHANICAL ENGINEER, UNIT CELL R&D

As a Senior Mechanical Engineer, Unit Cell R&D, reporting to the Manager, Unit Cell R&D, you will lead the development of next-generation unit cell and stack components for Invinity’s energy storage systems. You will translate requirements into robust, manufacturable designs, make key technical decisions, and collaborate across disciplines to improve performance, reduce cost, and enhance product durability. The role encompasses materials selection, component design, manufacturing process development, prototype qualification, and support for the transition of new technologies into commercial production.

Role & Responsibilities

    • Lead the design and development of unit cell and stack components for next-generation vanadium flow battery systems.

    • Select and qualify materials in collaboration with cross-functional materials, chemistry, and engineering teams.

    • Develop and optimize manufacturing and assembly processes, including injection moulding, plastic welding, bonding, and related production methods.

    • Define specifications, source suppliers, and qualify prototype components and assemblies.

    • Manage external suppliers and development partners through design, prototyping, and qualification phases.

    • Design and develop test cells, fixtures, and experimental methods to evaluate component and stack performance.

    • Plan and execute performance, durability, and reliability testing of unit cell and stack components.

    • Contribute to design reviews, risk assessments, and continuous improvement initiatives to enhance product performance, manufacturability, and cost competitiveness.

    • Mentor junior engineers and provide technical guidance across projects.

Qualifications & Skills

    • Bachelor's or Master's degree in Mechanical Engineering or a related discipline.

    • 5+ years of mechanical product development experience in batteries, fuel cells, automotive, industrial equipment, or related industries.

    • Strong foundation in mechanical design, structural analysis, fluid dynamics, thermodynamics, and heat transfer.

    • Experience developing products for manufacture using low- and high-volume production processes, including machining, forming, injection moulding, and plastic welding.

    • Experience designing sealing solutions for batteries, fuel cells, or other fluid-handling systems.

    • Hands-on experience designing, building, and commissioning prototype mechanical systems, fixtures, and test equipment.

    • Advanced proficiency in 3D CAD design and modelling, preferably using Onshape and/or SolidWorks.

    • Strong understanding of Design for Manufacture and Assembly (DFMA) principles.

    • Excellent analytical, organizational, and problem-solving skills.

    • Strong written and verbal communication skills, with the ability to clearly communicate complex technical concepts to diverse audiences.

    • Experience with energy storage technologies, flow batteries, fuel cells, or related electrochemical systems is considered an asset.

    • Demonstrated ability to thrive in a fast-paced, collaborative technology development environment.

    • Registered, or eligible for registration, as a P.Eng. or EIT with Engineers and Geoscientists BC (EGBC).

    • Eligible to work in Canada.

    • Project management and supplier management experience are desirable.

Invinity Energy Systems is small enough that every team member plays a critical role in our daily business, but large enough to participate in landmark clean energy projects around the world. With its exposure to our most impactful emerging products, this role will be critical in us delivering on those opportunities. If you are great at what you do, willing to engage with our dedicated, collaborative culture, and motivated by taking on and delivering against some of the biggest opportunities in energy today, we’d love to hear from you.

120000 - 135000 CAD a year

At Invinity Energy Systems, we are dedicated to providing equal employment opportunities to all individuals and practicing wage transparency to ensure fairness and equity. The salary for this position ranges from $120,000 to $135,000 per year and will be determined by a combination of the interview process, prior work experience, and educational background.
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