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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.…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

App Developer, Web Developer, Full Stack Developer, +2

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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.…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.

Skills

Android

Kotlin

Java

Experience Level

Android

Expert

Kotlin

Expert

Java

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.