Android is my primary platform—12+ years building scalable apps across fintech, e-commerce, mobility, and IoT, using Kotlin, MVVM/MVI, Coroutines, and modern Jetpack. iOS—collaborated with teams, contributed to shared architecture decisions, APIs, and cross-platform consistency. Kotlin Multiplatform—used for shared business logic (networking, domain layer) in cross-platform apps to reduce duplication and improve maintainability.

Oleh Sempirovych

Android is my primary platform—12+ years building scalable apps across fintech, e-commerce, mobility, and IoT, using Kotlin, MVVM/MVI, Coroutines, and modern Jetpack. iOS—collaborated with teams, contributed to shared architecture decisions, APIs, and cross-platform consistency. Kotlin Multiplatform—used for shared business logic (networking, domain layer) in cross-platform apps to reduce duplication and improve maintainability.

Available to hire

Android is my primary platform—12+ years building scalable apps across fintech, e-commerce, mobility, and IoT, using Kotlin, MVVM/MVI, Coroutines, and modern Jetpack.

iOS—collaborated with teams, contributed to shared architecture decisions, APIs, and cross-platform consistency.

Kotlin Multiplatform—used for shared business logic (networking, domain layer) in cross-platform apps to reduce duplication and improve maintainability.

See more

Experience Level

Expert
Expert
Expert

Work Experience

Lead Technical Engineer at Freelancer
February 1, 2025 - March 1, 2026
Designed and delivered Android applications for multiple clients, focusing on scalability and maintainability. Provided architectural consulting to improve app performance and reduce technical debt across projects. Guided clients on modern Android practices including modularization.
Lead Technical Engineer at GlobalLogic Inc.
February 1, 2021 - February 1, 2025
Led development of scalable mobile architectures across Android and iOS. Delivered cross-platform solutions using Kotlin Multiplatform. Developed Android applications in IoT and automotive domains, ensuring high reliability and performance. Led and coordinated Android and iOS development teams. Designed integration strategies with third-party services and adjusted CI/CD pipelines.
Android Tech Lead at Tranzzo Ltd (startup)
February 1, 2020 - January 31, 2021
Led development of secure Android fintech applications handling sensitive payment data. Led a team of developers, providing technical direction, task coordination, and mentoring. Designed and built payment SDKs, enabling integration with financial systems and services.
Android Tech Lead at AsiaCredit (startup)
January 1, 2019 - January 31, 2020
Developed loan processing Android application, ensuring reliability, security, and compliance with financial standards. Led a team of developers, providing technical leadership, mentoring.
Android Developer at Mobox PE
March 1, 2014 - January 31, 2019
Built and supported Android applications across commercial and non-commercial projects. Integrated third-party APIs, libraries, and backend services. Troubleshoot, debug, and resolve application issues to ensure optimal performance and user experience.
Technical Consultant at Agent – Plus Ltd.
March 1, 2011 - January 31, 2014
Mobile Commerce - implementation software on Android and Windows Mobile. Supported integrations and resolved issues. Improved client-server communication reliability.

Education

Master's degree in Computer Networks/Computer Systems at Kremenchuk Mykhailo Ostrohradskyi National University
September 1, 2008 - June 30, 2011
Diploma in Computer Programming at Industrial College, Ukraine
September 1, 2004 - June 30, 2008

Qualifications

Advanced Android Developer
January 1, 2015 - August 31, 2015

Industry Experience

Software & Internet, Professional Services