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Petros Mobile is a Point of Sale app used by gas station attendants to track refuellings and manage customer payments directly at the pump. The original version had been designed exclusively by developers, resulting in several usability issues that affected daily operations.
The project began with a full analysis of the existing app to understand how employees interacted with it on a daily basis. After defining the main goals, I conducted interviews with five users to gather feedback on what worked, what caused friction and what could be improved.
The most significant issue identified was the lack of clear visual feedback. Users often did not know whether the app was processing an action or had frozen, especially during tasks that required more time to complete. This uncertainty affected efficiency and created frustration during busy shifts.
These insights shaped the redesign and highlighted the importance of predictable responses, system status visibility and interaction clarity.
To ensure improvements aligned with real workflows, I mapped the key tasks performed by employees, such as:
• Viewing ongoing and completed refuellings
• Confirming payment details
• Processing transactions
• Navigating between active pumps
The mapping process revealed opportunities to improve task visibility, reduce confusion and provide clearer system states throughout the workflow.
After addressing usability issues, I moved on to the final UI design, using Material Design as the main style guide. The redesign focused on:
• A clean and light interface with simplified layouts
• Stronger visual feedback for loading and processing states
• Microinteractions that reinforced system behaviour
• Clearer hierarchy for ongoing and completed refuellings
• More intuitive navigation and task structure
These improvements helped employees understand at a glance what was happening in the app, reducing errors and improving confidence during transactions.
The final UI was created in Photoshop and prototyped using Marvel.
This project was particularly interesting because I had no previous experience with gas station operations. Learning how the environment worked and observing users in the field gave me valuable context and a better understanding of their routines.
It was also the first time I conducted face-to-face interviews in a real operational setting, which helped me improve my ability to craft effective questions, build rapport with users and gather richer insights for the design process.
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