Developed Android background services handling real-time POS transactions. Built MQTT-based bi-directional communication for live monitoring and remote configuration. Implemented socket-driven transaction system with automatic reconnection logic. Integrated hardware SDKs (printers, payment modules, vending systems). Architected MVVM Kotlin POS app with SQLite persistence. Managed release builds, signing, and production deployment. Improved stability through Crashlytics-driven debugging and monitoring.

Mobile Applications Developer at SIS Technology AD

July 1, 2022 - February 29, 2024

Developed Kotlin-based POS app using MVVM and Jetpack Compose. Implemented real-time socket communication for backend device control. Integrated REST APIs using Retrofit and Coroutines. Refactored legacy modules improving performance and maintainability.

Junior Mobile Applications Developer at SIS Technology AD

January 1, 2022 - July 1, 2022

Maintained Java Android apps with SQLite and REST integration. Built multi-printer payment module for tablet POS system. Debugged and stabilized hardware SDK integrations.