Illia Andrieiev

• Developed and maintained cross-platform mobile applications using Xamarin.Forms and .NET MAUI for a globally recognized elevator company.
• Implemented secure user authorization flow using OAuth, improving access control and data protection.
• Integrated AirWatch MDM support and BLE/TCP connectivity for device communication and remote configuration.
• Optimized post-migration performance and UI responsiveness following transition from Xamarin.Forms to .NET MAUI.
• Prepared the application for public distribution, ensuring compliance with store guidelines and internal quality standards.
• Collaborated with cross-functional teams to deliver stable, user-centric features under NDA constraints.

• Developed and maintained the mobile version of a large-scale unmanned aviation supervision service using Xamarin.Forms and .NET MAUI.
• Migrated core application components from Xamarin to .NET MAUI, enhancing performance, maintainability, and platform consistency.
• Collaborated directly with Microsoft experts to adapt and optimize application architecture for MAUI.
• Implemented a user feedback system that improved app store ratings and engagement.
• Utilized Refit and Polly to strengthen API communication and error handling for higher reliability.
• Integrated MapBox for advanced geospatial visualization and FCM for real-time notifications.
• Led team demos and knowledge-sharing sessions to ensure smooth feature delivery and code quality improvements.

• Developed and maintained the mobile version of a large-scale U.S. healthcare project in compliance with HIPAA regulations.
• Designed and implemented new features from scratch using Xamarin.Android and Xamarin.iOS, presenting results directly to the client.
• Improved application performance and responsiveness through code optimization and issue resolution.
• Enhanced reliability and maintainability by refactoring legacy code and applying best practices with MvvmCross and Polly.
• Collaborated closely with the client’s support team to analyze user feedback and address production issues efficiently.
• Utilized Realm for secure and efficient offline data storage tailored to healthcare data requirements.

• Developed and maintained the mobile version of a U.S.-based financial crypto platform using Xamarin.Forms.
• Participated in architecture design, contributing to scalable and secure application structure.
• Designed and implemented new features from scratch in close collaboration with the client.
• Worked effectively under high-tempo conditions and tight delivery deadlines to meet business objectives.
• Collaborated with an international development team based in the UAE to ensure seamless integration and delivery.
• Utilized Refit, Polly, Prism, and SQLite to enhance code reliability, maintainability, and offline functionality.
• Integrated ChartIQ for advanced financial charting and FCM for real-time user notifications.

Various Mobile Applications — Food Delivery, Multimedia, and IoT Security
Xamarin.Forms, Swift, REST, Prism, SQLite, AWS, Firebase Analytics, ReactiveUI, BLE, CoreData, Swinject

• Designed and developed cross-platform mobile applications across multiple domains, including food delivery, multimedia recording, and smart safe management.
• Led a team of junior developers on the food delivery project, providing technical guidance, code reviews, and task coordination to ensure timely and high-quality delivery.
• Contributed to architecture design to improve scalability, maintainability, and performance across projects.
• Created new features from scratch and optimized existing ones for better speed, responsiveness, and stability.
• Enhanced code reliability through refactoring, improved exception handling, and adherence to best practices.
• Collaborated closely with client-side teams to align implementation with business and design requirements.
• Worked with technologies such as BLE communication, reactive MVVM frameworks, and cloud services (AWS, Firebase Analytics) to deliver robust, user-centric mobile experiences.