Junior Matlab/Python Developers – Energy Market Software

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 market players. We specialize in the electricity and gas markets, enabling our users to make smarter, faster decisions to accelerate the energy transition, manage their financial risks and optimize their assets.

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

Hours: 32-40 hrs

Education level: MSc or PhD

Location: Haarlem, the Netherlands

Role Overview

We are seeking Junior Matlab/Python developers who are passionate about clean code, smart systems, and shaping the future of energy markets. 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.

Key Responsibilities Junior Matlab/Python Developer

• Develop and maintain Matlab/Python applications that support financial analysis, optimization 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 energy markets
• Contribute to infrastructure improvements, testing, and clean, maintainable code
• Utilize AI tools (like GitHub Copilot) to enhance development workflows and boost productivity

Required Qualifications

• Strong Matlab/Python skills – you have written substantial, well-structured code (whether in industry, personal projects, or academia)
• Comfortable with data-heavy problems: experience with Python libraries like Pandas, NumPy, Polars or similar
• Pragmatic results-oriented developer, able to finish developments on time; clear focus on what clients demand, rather than researching for too long
• A university degree (MSc or PhD) in a scientific or technical subject (e.g. Quantitative Finance, Econometrics, Engineering, Physics, Computer Science, Mathematics)
• 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 energy markets, working for large clients across the globe
• 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 Junior Matlab/Python developer? If you are personally interested in this opportunity, please send your CV and motivation letter to jobs@kyos.com. A coding assessment and other assessments 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.

Job vacancy: Junior Matlab/Python Developers – Energy Market Software - KYOS