INTERNSHIP

About My Experience

During my internship, I worked on creating a professional testing tool for a payment terminal. My goal was to help the production team check if the hardware in each terminal was functioning correctly before the main software was installed on the device.

I developed a mobile application that guides operators through a series of automated tests, like checking the touchscreen, card readers, lights, and other components. The app provides clear instructions and feedback during the process, making it easier to detect issues early.

To make this possible, I used Kotlin (a programming language for Android) and worked with specific hardware libraries provided by the device manufacturer. I also focused on making the app user-friendly, very straightforward, reliable, and easy to maintain in a factory setting.

Throughout the internship, I learned how to work with real-world hardware, manage different device states, and build a clean software structure that supports multiple types of tests. I also got practical experience with problem-solving, testing, and communicating technical decisions with engineers.

Key Achievements

• Learned Kotlin and Jetpack Compose from scratch to build a production-grade Android application
• Integrated PAX API to communicate with payment terminal hardware in real-time
• Designed and implemented hardware test flows for touchscreen, LED, magstripe, chip, NFC, speakers, printer and scanner
• Built a reusable test framework with ViewModel-based UI state management
• Participated in daily standups and sprint planning
• Documented the entire architecture and usage of the tool for handoff to the internal development team

Gallery

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How it all started

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My workspace during the internship

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Main Screen of the application

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Presentation of the assignment