Contact information

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Work experience

Middle Android Developer

from 08.2022 to now (3 years 7 months)
Circle Cloud Communication, Remote (IT)

Developed a mobile app for SIP-based calls using the ABTO SDK, implementing full functionality for incoming and outgoing calls with a focus on connection stability and call quality. Optimized network connections and call management for improved performance.

Integrated a real-time messaging solution based on Socket.IO, supporting text messages, audio, video, files, and other data types. Ensured reliable chat functionality and connection stability, including recovery after connection loss.

Implemented video meetings using WebRTC, including real-time screen sharing. Optimized video and audio quality, and managed device resources to ensure smooth performance across various devices and network conditions.

Developed client-side JWT authentication, handling secure token retrieval, storage, and automatic renewal for protected resource access.

Android Developer

from 12.2020 to 02.2022 (1 year 3 months)
Radio Record, Remote (IT)

Handled the maintenance and refactoring of legacy code to improve performance and scalability. Analyzed user statistics to optimize features and integrated video advertising solutions to enhance monetization. Implemented CI/CD practices for efficient product updates.

Fixed critical bugs and rewrote the music listening logic to improve HLS streaming performance.

Integrated Chromecast support for seamless music streaming, significantly improving user experience. Reduced the number of bugs and increased the overall stability of the application.

Android Developer

from 08.2020 to 12.2020 (5 months)
AlibiApps, Remote (IT)

Supported two applications. Finished the application to the final goal

Education

Київський Європейський університет

Менеджмент, Київ
Unfinished higher, from 2023 to 2024 (1 year)

Житомирська політехніка

ФІКТ, кібербезпека, Житомир
Higher, from 2018 to 2023 (5 years)

Knowledge and skills

• Git
• WebSocket
• SIP
• Work with the POS-terminal
• Kotlin
• Java
• MVVM
• WebRTC
• Android Flavors
• Chromecast
• Device API
• Jetpack

Language proficiencies

• English — average
• Ukrainian — fluent

Additional information

• GitHub:
https://github.com/kobylynskyiv

• Telegram:
https://t.me/kobylynskyiv