Software Development Intern

Posted: 30 April, 2026

Internship: Software Development Intern

Summary

AQUABATTERY is a pioneering climatetech startup with a mission to commercialise an affordable, safe and sustainable long duration energy storage (LDES) based on saltwater. Its innovative flow battery technology offers an LDES solution without relying on critical or toxic raw materials.

With fresh funding secured and its first commercial product on the horizon, this is an exciting time to become part of the growing team and contribute to building a cleaner, more resilient energy future.

As a Software Development Intern, you will support the development of an internal lab inventory system to improve how key components used in R&D processes are tracked and managed. Working with a modern Python-based stack, you will contribute to building a practical tool that helps the team operate more efficiently and make better use of resources. This is a hands-on role where you will work with real data, contribute to an existing codebase, and see the direct impact of your work.

The internship will have a duration of 4 months.

About the role

• Contribute to the development of an internal lab inventory system
• Work on a Python-based backend to track key lab components such as membranes, chemicals, and spacers
• Expand and maintain a PostgreSQL database to support inventory tracking
• Develop and improve features within the existing codebase
• Write tests to ensure reliability and maintainability of the system
• Collaborate with the team to understand requirements and translate them into technical solutions

Function requirements

We expect from you

• Currently enrolled as a student in Software Development, Computer Science, or a related field
• Experience with Python (SQLAlchemy and FastAPI required; PyQt6 is a plus)
• Basic knowledge of SQL, preferably PostgreSQL
• Familiarity with Git version control
• Ability to work independently and take ownership of tasks
• Comfortable asking questions and challenging assumptions when needed
• Open to feedback and code reviews
• Good communication skills in English

About our company

AQUABATTERY is a climate-tech start-up based in the Netherlands. Its vision is to empower the transition to net-zero by providing a scalable, sustainable and safe long duration energy storage solution through technology that enables the storage of electricity in saltwater. Its international team reinforces an impact-focused culture every day, taking on challenges and celebrating successes together.