Mechanical Engineer - Thermal Management

Wartsila Energy Storage is the leading global energy storage optimizer. Our mission is to deliver integrated energy solutions that build a resilient, intelligent, and flexible energy infrastructure - unlocking the way to an optimized renewable future. By integrating renewables, energy management technology, and storage with traditional energy resources, we reinvent clean energy production from the largest and most complex grids to the most remote and essential microgrids. We play a key role in Wartsila's vision towards a 100% renewable energy future through flexibility, reliability, and integration and a more sustainable world for us all.

Wartsila's Energy Business is looking for a Mechanical Engineer - Thermal management for the Energy Storage Business. The role will be part of the hardware engineering team. The ideal candidate will be a self-starter that can work both independently and as part of an interdisciplinary team. The candidate should thrive in a fast paced, constantly changing environment while the industry and company go through substantial growth.

Preferred location for this position is Wartsila's location in Scarborough, ON (Toronto Area). The selected candidate will be required to work onsite.

Main Responsibilities:

• Develop and optimize battery module and power electronics thermal management systems designs to meet specific requirements, such as energy density, power output, thermal management, and safety.
• Support the design and development of mechanical, electrical, and thermal components cooling systems, enclosures, and electrical power buswork. Perform thermal load calculations and size and select cooling system components accordingly
• Collaborate with battery module and cooling component (chillers) and fluid handling (piping) component suppliers to ensure compatibility and integration in system design.
• Collaborate with manufacturing teams to develop and optimize assembly processes, tooling, and fixtures.
• Support the transition from prototype to mass production, including pilot builds / testing and manufacturing ramp-up activities.
• Manage suppliers and projects to ensure timely program deliverables within budget.
• Develop various battery system thermal control test experiments, document procedures, and perform the tests in lab and shop environments.
• Design piping systems, mounting, enclosures, racks, and other features as necessary.
• Develop and document test procedures, assembly and installation instructions, and other document and system documentation.
• Collaborate in a team environment and/or take charge of opportunities to develop optimal solutions for customers and development programs.
• Support manufacturing and system deployment activities by collaborating to resolve issues and ensure products and systems are delivered to specification.

Minimum Experience and Educational Requirements:

• BS Required, MS degree desired
• 3-5 years or more of product/project development and mechanical engineering experience, HVAC industry experience (liquid cooling equipment, piping, controls) and hands-on practical is especially valuable Experience with flow calculations and thermal load calculations is critical. Ansys/Fluent is a plus, PTC Creo/Windchill is a plus
• Experience with energy storage systems is valuable
• Knowledge of heat transfer and thermodynamics
• Experience solving customer's needs and issues
• History of maintaining positive working relationships with customers, peers, subordinates, vendors, shop and office in a fast-paced environment
• Excellent communication skills
• Team player attitude internally and externally
• Entrepreneurial drive with hunter mind-set
• Willing to travel up to 20% of the time

Last application date: 12/08/2025

Why you and us:

Wartsila Canada is committed to Employment Equity, supports diversity in the workplace, and encourages applications from all qualified individuals, including women, members of visible minorities, Indigenous persons, and persons with disabilities. If you require accommodation during the recruitment process, please let us know, and we will work with you to support your request. At Wartsila we value, respect and embrace all our differences, and are committed to diversity, inclusion and equal employment opportunities; everyone can be their true self and succeed based on their job-relevant merits and abilities.

We are not accepting unsolicited submissions from 3rd party recruitment agencies.

Successful applicant must be authorized to work in the Canada without sponsorship. We look forward to hearing from you. Qualified candidates must apply online: