Herndon, VA, US

Function:  Engineering
Job Category:  Engineering

Mechanical Engineer - Thermal Management


Wärtsilä is an innovative technology company known for being a forerunner in the Marine and Energy markets. Every day, we - Wärtsilians - put our hearts and minds into turning Wärtsilä's purpose of enabling sustainable societies with smart technology, and our Smart Marine and Energy visions into reality. Our ultimate aim is to provide increased value to both our customers and society. New, game-changing ideas and continuous improvement have been part of our DNA since 1834. Together, we can create new business opportunities and a more sustainable future that we can all be proud of.

We are transitioning the world towards a cleaner future. By pushing the boundaries of engineering and technology, we make it work. We are always on the lookout for future-oriented talent - want to join the ride?


Wärtsilä’s Energy Business is looking for a Mechanical Engineer – Thermal management for the Energy Storage & Optimization 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(s) for this position is Wärtsilä’s location in Herndon, VA.



Main Responsibilities:


  • Develop and optimize battery module designs to meet specific requirements, such as energy density, power output, thermal management, and safety.
  • Design and develop mechanical, electrical, and thermal components for battery modules, such as cell holders, busbars, cooling systems, and enclosures.
  • Collaborate with cell suppliers to ensure compatibility and integration of cells within the battery module.
  • Collaborate with manufacturing teams to develop and optimize assembly processes, tooling, and fixtures.
  • Support the transition from prototype to mass production, including pilot builds and ramp-up activities.
  • Manage suppliers and projects to ensure timely program deliverables within budget
  • Develop various battery cell test experiments, document procedures, and preform the tests in a lab environment
  • Conduct CFD analysis using Ansys Fluent to investigate innovative thermal cooling solutions for battery systems
  • Digital Twin development of energy storage system in Matlab software environment - ECM and thermal model generation (1D circuit or ROM)
  • Design mechanical enclosures, racks, parts, and/or features intended to be used in the energy storage industry
  • 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


  • MS degree required, PHD desired
  • 3-5 years of product development and mechanical engineering experience
  • Experience with Solid works, Inventor, AutoCAD, Matlab,Simulink and Ansys
  • Experience with energy storage systems in preferred
  • Strong understanding of electrochemical energy storage principles and lithium-ion battery technologies.
  • Knowledge of heat transfer and thermodynamics
  • Solving customer’s needs and issues
  • Maintain 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



Why you and us


You will be a part of a global organization with a local presence and work in an exciting and dynamic working environment with highly motivated and skilled co-workers. We offer interesting and challenging work tasks, as well as personal and professional development in a great team. 


If you feel excited about being a part of this working environment and think your personal skills and qualities match the job requirements, we look forward to receiving your job application.


Successful applicants must be authorized to work in the USA without sponsorship.


A successful candidate will have the ability to travel to other countries.


We look forward to hearing from you. Qualified candidates must apply online: https://www.wartsila.com/careers


Individuals hired for positions that require on-site customer interactions and/or in-person travel may be required to be fully vaccinated against COVID-19 or other country-specific vaccinations unless otherwise prohibited by law.  


Wärtsilä North America values our employees. We offer a competitive salary and a comprehensive benefits package. Wärtsilä North America is an EOE/AA employer. 





Nearest Major Market: Washington DC