OPAP S.A. – OPAP Play Betting Machines UI

This project focused on the complete redesign and redevelopment of the user interface powering OPAP Play betting machines deployed across OPAP retail locations. The application is a core operational system used daily by a large number of users in physical stores, supporting essential betting flows and real-time interactions in a demanding retail environment. Beyond visual improvements, the scope of the work addressed deeper structural and architectural challenges within the existing frontend codebase. Over time, the application had accumulated technical debt that made feature development, maintenance and long-term scalability increasingly difficult. A key objective of the project was to establish a clean, modular and maintainable frontend architecture suitable for an enterprise-scale system. A significant part of the effort involved carefully modernizing the frontend stack while ensuring operational continuity. The project introduced improved component structure, clearer separation of concerns and more predictable data handling patterns, all while respecting the constraints of a desktop-based Electron environment deployed across physical retail stores. The work was carried out with a strong focus on stability, performance and long-term sustainability. Given the business-critical nature of the system, every architectural decision needed to balance modernization with reliability, ensuring that the application could support ongoing feature development and evolving business requirements without disrupting daily betting operations.