Battery Performance Engineer

About the job

Join Our Journey Towards Fossil-Free Living as a Battery Performance Engineer - BESS

At Vattenfall, one of Europe's largest generators of electricity we're on a mission to enable fossil-free living within one generation. The Business Unit Solar & Batteries is part of Vattenfall’s Business Area Wind and responsible for developing, constructing, and operating renewable energy assets across multiple European markets. Our mission is to enable fossil-free living by delivering profitable and scalable solar and battery storage solutions.

Do you want to drive innovation in BESS (battery energy storage systems)? Are you passionate about data, analytics and operational excellence? Join us as a Battery Performance Engineer in our BESS Engineering department, which is the technical backbone to deliver high performing and cost-effective BESS assets and help us to shape the future of fossil-free energy!

What You Will Do

As the Battery Performance Engineer, you will play a key role in optimizing battery performance, safety and longevity through expert evaluation. You’ll provide technical insight across our entire BESS project portfolio. We seek a structured, analytical and proactive team player with a passion for BESS and data-driven decision-making.

Key Responsibilities:

• Provide technical expertise in battery systems, including degradation management, performance optimization, warranties and safety standards.
• Define and manage data flows for operating BESS assets — from data collection to storage — ensuring data quality, consistency and accessibility.
• Conduct data processing, analysis and visualization to support data-driven decision-making for projects and asset operations.
• Develop and specify performance and operational requirements for BESS and support the sourcing of suitable technologies and suppliers through technical due diligence.
• Integrate operational lessons learned into future projects and engineering standards, including continuous improvement of battery degradation models.
• Collaborate with asset managers to enhance operational performance and maximize battery asset availability.
• Monitor and share insights on battery technology trends, market developments and innovations to support informed technical decisions and continuous improvement.

Your profile

What we ask from you:

• A Master’s degree (preferred) or a Bachelor’s degree with equivalent experience in engineering, energy systems, data science or a related technical field.
• Deep understanding of battery energy storage technologies, including performance optimization, degradation analysis and lifecycle management.
• 3–5 years of experience in data engineering, analytics, or visualization, ideally in battery storage or energy systems.
• Proficiency in Python for data processing and analysis; experience with MATLAB, Databricks, Power BI, or Grafana is a plus.
• Strong analytical and problem-solving skills to tackle complex technical challenges.
• Proactive and solution-focused mindset, comfortable working in a fast-paced, international environment.
• Motivated communicator and collaborator across diverse teams and disciplines.
• Fluency in English; German is a plus.

Who You Are

You are a technically curious and data-driven engineer with a strong passion for battery energy storage systems and their role in a sustainable energy future. You thrive in dynamic, fast-paced environments where innovation and continuous learning are part of the daily work.

Analytical and structured, you enjoy diving into complex technical challenges — from system performance and degradation modelling to data flows and visualization. You’re confident working with large datasets and translating insights into actionable improvements for operations and engineering.

Why Join Us?

• Purpose-Driven Work: Contribute directly to a fossil-free future through innovative energy storage solutions.
• Collaborative Environment: Be part of a self-organized, empowered team that values inclusivity, autonomy and shared success.
• Opportunities for Growth: Build on your technical expertise while developing specialist skills for future career advancement.
• Competitive Compensation: Enjoy a comprehensive benefits package designed to support your professional and personal well-being.

If you’re ready to take on this significant technical role and help us drive performance excellence in the battery energy storage sector, we’d love to hear from you!

Additional information

Our Offer:

We offer good remuneration, a challenging and international work environment and the possibility to work with some of the best in the field. You will be working in interdisciplinary teams and you can always count on support from committed colleagues as ‘Ask and Share’ concept is essential for the way we work. We offer attractive employment conditions and opportunities for personal and professional development.

For more information about the recruitment process you are welcome to contact our recruiter Cristina Sigel via mail: cristina.sigel@vattenfall.de

We look forward to receiving your application!

About the company

Vattenfall is a European energy company with approximately 21,000 employees. For more than 100 years we have electrified industries, supplied energy to people’s homes and modernized our way of living through innovation and cooperation. We now want to make fossil-free living possible within one generation. To be able to reach this ambitious goal we are looking for talented individuals who, in addition to their passion for their own role, also have strong team spirit and want to contribute to supporting a meaningful corporate mission.