Principal Engineer, System Integration at ESS
Wilsonville, OR, US

ESS is committed to the safety and wellbeing of our employees and community therefore we require COVID-19 vaccinations as a condition of employment.


Catalyzing a cleaner future.

At ESS (NYSE: GWH), our mission is to accelerate global decarbonization by providing safe, sustainable, long-duration energy storage that powers people, communities, and businesses with clean, renewable energy anytime and anywhere it’s needed. As more renewable energy is added to the grid, long- duration energy storage is essential to providing the reliability and resiliency we need when the sun is not shining and the wind is not blowing. 


Our technology uses earth-abundant iron, salt, and water to deliver environmentally safe solutions capable of providing up to 12 hours of flexible energy capacity for commercial and utility-scale energy storage applications. Established in 2011, ESS Inc. enables project developers, independent power producers, utilities, and other large energy users to deploy reliable, sustainable long-duration energy storage solutions. For more information visit 


ESS is hiring a motivated Principal Engineer, Systems Integration to support our fast-growing operations. In this role, you will manage and mentor projects which encompass Battery Stack manufacturing optimization and Iron Flow Battery systems integration.


What you’ll do at ESS.

  • Process integration of battery stack pilot manufacturing and Iron Flow Battery systems integration/test/control.
  • Enable optimized yield and scalability for battery stack manufacturing process. 
  • Ensure system level performance optimization based on inhouse engineering systems as well as data from fleet monitoring of deployed systems.
  • Review and analyze data from battery stack and systems key performance index to continuously improve manufacturing/integrating/testing processes.
  • Be part of key transfer team of pilot manufacturing to full production.
  • Work closely the Battery Stack development team, Systems engineering team, Pilot manufacturing, Quality Assurance teams to ensure ESS Iron Flow Battery solution can make performance specifications and manufacturing KPIs.
  • Design For Six Sigma, Statistical Process Control, Reliability, Validation Planning

What you bring to the table.

Minimum requirements:

  • Masters degree in Mechanical, Electrical, Chemical Engineering, or equivalent Engineering degree
  • 10+ years integration experience with battery structures, specifically thermal and mechanical 
  • Specific knowledge of engineering mechanics, heat transfer principles and thermodynamics, sensing, physics.
  • Strong knowledge and practical application of mechanical, thermal, electrical, and structure, including their optimization. 
  • Understanding of engineering theory of mechanical and electrical interfaces and their relationship to chemical reactivity; Iron Flow Battery
  • Ability to manage multiple and significantly complex projects and assignments with high level of autonomy and accountability for results
  • Strong understanding of battery cells, modules, packs or fuel cell stack
  • Proven ability in project management skills and ability to teach others

We’d love to see:

  • PhD in Mechanical, Electrical, or Chemical Engineering 
  • Familiarity with Iron Flow Battery Systems
  • Demonstrated system integration problem solving
  • NX, MatLab, Python, Engineering Analysis Software
  • Prior Experience in VDDV, modeling, laboratory, validation, hardware development
  • Statistical background and certifications
  • Knowledge of manufacturing processes
  • Industrial chemical processing
  • Knowledge of Iron Flow Battery cell design and performance, analysis and testing
  • DFSS Black Belt


As an equal opportunity employer, we are open to considering every qualified candidate who is eligible and legally authorized to work in the United States on a full or part-time basis, and who does not require a visa sponsorship or who is of H1B1 status. 


Benefits of working at ESS.

In addition to the value of working with and helping grow a global reaching clean technology, ESS offers Company assisted medical, dental and vision, 401k with Company match, Employee Stock Purchase Plan (ESPP), generous PTO plan, 8 paid holidays, and approved PPE reimbursement.


Please note: This job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities, and activities may change at any time with or without notice.