Сергій

Serhii Yatsinskyi
Software Engineer
[open contact info](look above in the "contact info" section)
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Location: Kyiv, Ukraine
[open contact info](look above in the "contact info" section), [open contact info](look above in the "contact info" section)

SUMMARY BACKGROUND
A Software Engineer with over 13 years in IT, including 11 years in
Android development and more than 3 years in leadership roles. Has
experience with a wide variety of projects – from video chat apps and a
dating platform for golf players to an Android MDM solution with
encryption and complex communication protocols.

CORE SKILLS
● Android SDK;
● Java, Kotlin;
● Claude Code
● RxJava2;
● Dagger2;
● SocketIO;
● Google maps;
● SQLite;
● Room Persistence;
● SQLCipher, SQLite encryption extension;
● JUnit, Robolectric, Espresso;
● Clean architecture;
● Task/Sprint planning;
● Code review;
● Database performance;
● Writing requirements.

WORK EXPERIENCE
Star
Senior Android Engineer
February 2018-Present

Projects description:
Android point-of-sale application.
Worked on a large, modular application in Kotlin, using Clean Architecture
and MVVM with Hilt, Coroutines/Flow, RxJava, Room and Jetpack
Compose. It integrates with payment terminals and printers. Quality is
enforced through JUnit 5, MockK, Espresso-based UI automation.

Responsibilities:
● Performed code review for the entire team
● Developed new features and maintained legacy code
● Covered functionality with E2E tests
● Fixed flaky automated tests to make CI more reliable
● Made various fixes

Technologies used:
Java, Kotlin, Coroutines, Jetpack Compose, RxJava, MVP, MVVM, Hilt,
JUnit, Robolectric, Espresso, Claude code

Secure application as part of an MDM project.
The application featured additional encryption mechanisms, supported
security standards such as S/MIME, and utilized multiple communication
protocols, including ActiveSync, EWS and the Microsoft Graph API.

Responsibilities:
● Developed new features and maintained legacy code
● Supported communication protocols (ActiveSync, EWS, Microsoft
Graph API)
● Worked on tech debts, converting classes from Java to Kotlin by
utilizing modern technologies
● Worked with certificates, CRL
● Covered functionality with tests
● Compared database encryption mechanism by effort and
performance degradation
● Wrote requirements for the upcoming features
● Communicated with customers
● Led a team
● Improved team's performance
● Assigned responsibilities within a team
● Planned tasks and Sprints
● Performed code review for the entire team

Technologies used:
Java, Kotlin, Coroutines, RxJava2, MVP, MVVM, Encryption, Dagger2,
Android Enterprise, JUnit, Robolectric, Espresso, github Coiilot

Cleveroad
Android Developer
March 2015 - February 2018

Responsibilities:
● Developed multiple projects for Android platform, including
Text/Video chat, dating apps, etc

Technologies used:
Java, Android SDK, Kotlin, MVP, RxJava2, Dagger2, WebSocket, Git,
GreenDao, Realm, In-app Billing, Google Maps

Av-Tech LLC
Full-stack Developer
March 2012 - February 2015

Responsibilities:
● Developed and administrated a service for GPS monitoring, working
with Linux-based server daemon, web and mobile clients
● Developed other various small Android projects

Technologies used:
Java, Android SDK, Objective C, Google Maps, Yandex Maps, C/C++,
PostgreSQL, VHDL, PHP, JavaScript, HTML, C#, MySQL

EDUCATION
Specialist degree in Computer networks and Dnipro - 2012
systems from Dnipropetrovsk State Technical
University of Railway Transport

ADDITIONAL SKILLS
Upper-Intermediate level of English, Native level of Ukrainian.