Kotlin Multiplatform Developer

Sii Ukraine is a subsidiary of Sii Poland — the leader in IT, engineering, and consultancy services with over 7500 IT experts in Poland and more than 250 prestigious customers. We are looking for ambitious and top-quality professionals to join our project teams.

We are looking for a Senior Mobile Developer with strong expertise in multiplatform development, particularly Kotlin Multiplatform, to join a project for a multinational healthcare company that develops and markets medical devices, aiming to improve the lives of people with intimate health conditions. The project focuses on building secure, accessible, and innovative mobile solutions that enhance patient experiences worldwide.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promote a diverse and inclusive work environment.

Tasks:

• Design and develop cross-platform mobile features using Kotlin Multiplatform
• Build and maintain shared business logic across Android and iOS platforms
• Integrate mobile applications with connected smart devices and data sources
• Ensure secure data handling and reliable communication between the app and hardware
• Collaborate closely with backend developers, UX/UI designers, and product owners
• Implement and promote accessibility best practices to support diverse user needs
• Participate in code reviews and contribute to continuous improvement of mobile architecture
• Support testing, debugging, and performance optimization of the mobile application
• Document technical solutions and implementation decisions

Requirements:

• Commercial experience in mobile application development
• Hands-on experience with Kotlin Multiplatform
• Strong knowledge of Kotlin and modern mobile development practices
• Understanding of cross-platform architecture and shared code design
• Experience working with mobile apps that interact with hardware or IoT devices
• Familiarity with accessibility standards in mobile applications
• Ability to translate product and user requirements into technical solutions
• Strong collaboration skills and experience working in cross-functional teams
• Good command of English
• Tax residence in Ukraine is required

Nice to have:

• Experience in healthcare, medical, or well-being-related projects
• Knowledge of Bluetooth or real-time data communication
• Experience with security-sensitive or privacy-focused mobile applications
• Familiarity with Android and iOS native development environments
• Understanding of usability challenges for users with specific health conditions