Python Developers (closed)

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Job vacancy: Python Developers – Energy Software for Renewables & Batteries

KYOS is looking for Python developersLocation: Haarlem (Near Amsterdam) – Hybrid Work Possible. You must be an EU-citizen or have a valid work permit for the Netherlands. 
Type: Full-time

About Us

We are a dynamic and rapidly growing software company located in the heart of Haarlem, just outside Amsterdam. Our international team develops impactful tools for energy traders and project developers working with battery storage and renewable assets. We specialize in the electricity markets, enabling our users to make smarter, faster decisions to accelerate the energy transition.

We don’t trade ourselves; instead, we provide the intelligent software that empowers those who do.

The Role

We are seeking Python developers who are passionate about clean code, smart systems, and shaping the future of renewable energy and battery storage. You will join a collaborative and talented team working on tools used by clients active in real-world energy markets. Whether you are an experienced developer or just starting your professional journey, we value strong programming skills, curiosity, and a proactive mindset.

What You’ll Do

  • Develop and maintain Python applications that support analysis, forecasting, and decision-making in energy markets
  • Collaborate with a close-knit team to design features, improve performance, and deliver high-quality software
  • Work with real-time and historical data from electricity markets
  • Contribute to infrastructure improvements, testing, and clean, maintainable code
  • Utilize AI tools (like GitHub Copilot or ChatGPT) to enhance development workflows and boost productivity

What We’re Looking For

  • Strong Python skills – you have written substantial, well-structured code (whether in industry, personal projects, or academia)
  • Comfortable with data-heavy problems: experience with libraries like Pandas, NumPy, Polars or similar
  • It is a plus if you have experience with Postgresql, Dash, html and/or CSS
  • A university degree (BSc or similar), in a scientific or technical subject (e.g., Engineering, Physics, Computer Science, Mathematics) is a plus. However we are looking for a mix of skills so quantitative development experience is not a must.
  • An eagerness to learn and contribute in a fast-moving, collaborative environment
  • Good communication skills and a team-first attitude
  • Experience with energy systems, trading, or renewables is a bonus, but not required
  • We’re open to junior, mid-level and senior developers — it really depends on your experience and what you bring to the table

Why You’ll Like Working With Us

  • A highly collaborative, international team working from a beautiful office in central Haarlem
  • The opportunity to work on meaningful problems in the energy transition
  • Opportunities to grow and shape your role – we hire for potential, not just experience
  • Flexible work setup, including hybrid work options
  • Competitive compensation

How to Apply

Do you think you are our new Python developer? If you are personally interested in this opportunity, please send your CV and motivation letter to jobs@kyos.com. A coding assessment will be part of the recruitment process. Note that we will not provide VISA sponsorship, you need to have a valid work permit for the Netherlands to be eligible for this role.

Note to Recruiters and Service Providers
We kindly request that recruiters and other service providers/intermediaries do not contact us via email or phone regarding this position.

Contact KYOS