Working student - Hybrid Energy Systems Developer (f/m/d)

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 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. 

Business Area Wind is responsible for Vattenfall’s Onshore & Offshore Wind, Solar and Batteries. Today we develop, construct and operate renewable assets and hybrid parks in Sweden, Denmark, Germany, the Netherlands and the UK.

We are now looking for a Working student - Hybrid Energy Systems Developer to join our Hybrid Park Team within the Revenue Management Department in Business Unit Solar & Batteries (BU SoBa) in Hamburg or Berlin . The Hybrid Park Team develops advanced models and analytical tools to optimize hybrid park design and operation. We provide analysis for development projects and operational assets to maximize revenues and profitability.

Job Description

Would you like to work for Vattenfall, one of Europe’s leading energy companies? Are you excited to apply your analytical capabilities, critical thinking, and programming skills to support the energy transition? Then this position could be the perfect opportunity for you.

Your main tasks and responsibilities as a Hybrid Energy Systems Developer:

• Developing and improving python-based Hybrid Park optimization models for technologies such as batteries, wind or solar farms. This involves implementing new features and improving existing functionality.
• Increasing model robustness and data quality through testing frameworks and data validation.
• Integrating databases and APIs for improved model architecture and automation.
• Preparation of supporting python-based tooling to improve the process of analysing Hybrid Park and Flex development projects and existing assets.
• Propose and present implementation approaches to the team, demonstrating confidence in suggesting solutions and explaining technical decisions.
• Jointly refining user requirements into concrete model improvements as input for Sprint planning and model implementation.

Qualifications

• Enrolment: Currently enrolled in computer science, statistics, mathematics, physics, engineering, or another quantitative field, with at least 12 months remaining in your studies.
• Technical Skills: Advanced programming knowledge in Python; familiarity with energy markets is a plus.
• Soft skills: Team player with strong analytical and critical thinking skills; proactive, responsible, and eager to learn. Good communication skills and willingness to share knowledge.
• Language: Strong command of English both written and verbally.
• Mindset: Passionate about renewable energy, collaborative, and open-minded.

Additional Information

We offer:

• Impactful Work: Contribute to developing innovative hybrid parks with batteries that accelerate the renewable energy transition.
• Collaborative Environment: Join an international, diverse, and supportive team with a decentralized management approach.
• Professional Growth: Take responsibility early and enhance your skills in Python, Power BI, and market analytics.
• Learning Opportunities : Gain hands-on experience in energy market modelling and contribute to real decision-making for renewable assets.
• Competitive Compensation: Enjoy a rewarding package in a diverse and inclusive workplace at our new Offices in Hamburg and Berlin.

At Vattenfall we are convinced that diversity contributes to build a more profitable and attractive company and we strive to be good role model regarding diversity. Vattenfall works actively for all employees to have the same opportunities and rights regardless of gender, ethnicity, age, transgender identity or expression, religion or other belief, disability or sexual orientation.

More information

Please note that this job is hybrid and regular attendance in the office either in Hamburg or Berlin is required.

We welcome your application in English, including CV and cover letter no later than 04.01.2026. Please apply via our website, as applications sent by other means cannot be considered.

For questions, feel free to contact our recruiter Sabrina Parsons via mail: [email protected].

At Vattenfall we are convinced that diversity contributes to build a more profitable and attractive company and we strive to be good role model regarding diversity. Vattenfall works actively for all employees to have the same opportunities and rights regardless of gender, ethnicity, age, transgender identity or expression, religion or other belief, disability or sexual orientation.

The security of Vattenfall and its employees is essential. For that reason, a pre-employment screening will be part of your recruitment process. The screening is based on the role you will fulfill within Vattenfall. The screening will be performed by a third party, DISA.