In July 2025, Hrbdev developed the foundational Device Data Transfer feature for the persian-calendar/persian-calendar repository, focusing on backend development using JavaScript. They introduced a new API route and controller to enable device-to-device data transfer, laying the groundwork for future cross-device syncing and data portability. Their approach emphasized modular architecture and clear commit hygiene, ensuring traceability and scalability for subsequent enhancements. By prioritizing architectural scaffolding over immediate bug fixes, Hrbdev aligned the backend with the product roadmap and improved extensibility. The work demonstrated backend API design skills and established a robust base for future feature expansion and maintainability.