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Herndon, VA, US

Function:  Digital Technology & Innovation
Job Category:  Digital Technology and Open Innovation

Full Stack Software Engineer

Wärtsilä is leading the transition towards a 100% renewable energy future. We Wärtsilians help our customers unlock the value of energy transition by optimizing their energy systems and future-proofing their assets. Did you know Wärtsilä has delivered 74 GW of power plant capacity and more than 80 energy storage systems in 180 countries around the world?

In this fast changing world of energy, we are constantly on the lookout for future-oriented talent to join our team and to work towards enabling sustainable societies through innovation in technology and services - together. Want to join the ride?


Full Stack Software Engineer

Wärtsilä Energy Storage & Optimization (ES&O) 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 Wärtsilä’s vision towards a 100% renewable energy future through flexibility, reliability, and integration and a more sustainable world for us all.

We are seeking a mid-level Full Stack Software Engineer to join our growing software team. This position can be remote or located in our software development center in Herndon, VA, USA.


This position is within the Data Science group where we develop products that are deployed around the world involving battery system modeling, battery system monitoring, islanded grid control, renewable energy forecasting, and electricity market bidding.


What will you be doing

The primary function of this role is to advance the development of our Battery Energy Storage Systems modeling platform and tools. As a Full Stack Software Engineer, you will lead the productization and development of simulation frameworks, simulation tools, and data driven battery modeling capabilities in Python and MATLAB. This role will be an integral part of the Data Science team in a Research and Development role, working to accelerate the development of our software capabilities while supporting new product development initiatives in the field of automated power system optimization.


As a Full Stack Software Engineer, you will focus on these responsibilities:

  • Execute our vision for the next evolution our Digital Twin battery simulation platform.
  • Develop and implement frameworks for scalable timeseries simulations.
  • Work with our cloud services development team to deploy and monitor the Digital Twin platform in a cloud/bare-metal hybrid environment, helping to tune and debug performance
  • Identify methods for improving performance within the context of the business logic and key performance indicators
  • Write user facing documentation to clearly communicate the structure of the tool and how each feature can be leveraged.
  • Support tasks outside of job description as needed


The candidate must be able to embrace the fast and dynamic environment of a growth stage company, comfortable with adjusting quickly to changing priorities.


To be successful in this role, we expect you to have:

  • B.S. or M.S. in Computer Science, Engineering, Physics, Applied Math, or similar
  • 3-7 years of relevant experience
  • Expert level in Python as a programming language (5+ years)
  • Experience working in an agile development environment using common tools such as JIRA and Git
  • Proficiency in React (or similar UI libraries)
  • Familiarity with Docker and Kubernetes
  • Track record of a career trajectory in and towards software engineering
  • Ability to work independently and provide strong leadership
  • Prior experience with production systems running advanced statistical algorithms and machine learning
  • Experience with Google Cloud Platform
  • Experience with Jenkins
  • Experience with OIDC
  • Strong leadership record with active participation in renewable energy associations, forums, clubs, or groups


Why you and us

You will be a part of a global organization with 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 by 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 applicant must be authorized to work in the USA without sponsorship.


We look forward to hearing from you. Qualified candidates must apply online:


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


Vaccination is a vital tool to reduce the presence and severity of COVID-19 cases in the workplace, in communities, and in the nation as a whole. The spread of COVID when working in customer facilities and project sites can lead to costly site shutdowns, for which Wärtsilä could be deemed financially responsible. Many local government authorities require proof of vaccination to enter the state or country, and many of our customers require proof of vaccination to be on a project site. In line with legal regulations Wärtsilä has implemented a COVID-19 policy on vaccination and testing to reduce the risk of transmission on Wärtsilä premises. Wärtsilä strongly encourages all employees to be vaccinated to protect themselves and other employees.




Last application date: 30/05/2022

At Wärtsilä 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.

This is Wärtsilä

Wärtsilä Energy leads the transition towards a 100% renewable energy future. We help our customers in decarbonisation by developing market-leading technologies. These cover future-fuel enabled balancing power plants, hybrid solutions, energy storage and optimisation technology, including the GEMS energy management platform. Wärtsilä Energy’s lifecycle services are designed to increase efficiency, promote reliability and guarantee operational performance. Our track record comprises 74 GW of power plant capacity and more than 80 energy storage systems delivered to 180 countries around the world. 


Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets. We emphasise innovation in sustainable technology and services to help our customers continuously improve their environmental and economic performance. Our dedicated and passionate team of 17,000 professionals in more than 200 locations in 68 countries shape the decarbonisation transformation of our industries across the globe. In 2021, Wärtsilä’s net sales totalled EUR 4.8 billion. Wärtsilä is listed on Nasdaq Helsinki. Find out more at




Nearest Major Market: Washington DC