Mobile & Web App Developer

Mobile & Web App Developer (Fulltime)

Xemex develops smart technologies and cloud services in the field of energy. This is how we make the use, management and generation of energy more efficient, affordable and sustainable. With live insight and control over energy consumption, we support end users, installers and energy companies in optimizing energy management. Our transparent systems work with the most common types of energy and devices. We accelerate the energy transition and we build a sustainable future. Xemex stands for balance in energy with innovative, scalable solutions.

Your job:

You will take ownership of both mobile and web app development and interface design, ensuring that our mobile solutions are robust, visually compelling, and user-friendly.

Key responsibilities:

• Design and build cross-platform mobile applications using Flutter and Dart
• Design and build web portal (SPA) using Angular and JavaScript
• Create detailed UX flows, wireframes, and high-fidelity UI mockups in Figma
• Translate Figma designs into pixel-perfect, performant mobile UIs
• Collaborate with product, backend, and hardware teams to define and deliver user-centered features
• Incorporate real-time data visualizations, device controls, and user feedback into the mobile interface
• Conduct user research and usability testing to refine designs
• Maintain consistency through reusable design components and style guides in Figma

What you bring:

• 2+ years of experience in mobile app development using Flutter and Dart
• 2+ years of experience in web portal development using Angular
• Strong command of Figma for UI/UX design, prototyping, and design systems
• Demonstrated ability to take a design from concept to code
• Solid understanding of mobile UX principles and best practices for iOS and Android
• Experience with RESTful APIs, real-time data (MQTT/WebSockets), and JSON
• Familiarity with state management approaches
• Strong portfolio showcasing both Flutter apps and Figma design work
• Familiarity with data visualization in mobile apps
• Experience working with version control (Git) and CI/CD pipelines
• Knowledge of accessibility and performance optimization in mobile apps

What do we offer:

• An attractive salary, supplemented with a fully employer-paid pension;
• 30 vacation days
• Laptop and iPhone;
• A healthy lunch at the office in Rosmalen;
• An informal and dynamic working atmosphere with enthusiastic colleagues.

Are you excited to be part of our success story? Then send your CV to

For more information please contact Anne-May Derksen

Please note: Candidates who are not currently residing in the Netherlands and/or do not have proficiency in the Dutch language will not be considered for this position.