Ростислав

Rostyslav Kosiakin
A N D R OI D D E V E L OP E R

PROFESSIONAL SUMMARY
Android Developer with no commercial experience, a theoretical foundation in Computer Science and
hands-on experience through multiple self-directed and collaborative academic projects.
Proficient in both Kotlin and Java, with practical application of modern Android development practices,
including the use of Jetpack Compose. Experienced in implementing real-time data synchronization, user
authentication, and integrating libraries such as Firebase, Retrofit, Apollo GraphQL, Hilt etc. Applied MVVM
architecture, dependency injection, and asynchronous programming with coroutines across various
personal projects.
Recently graduated with a Bachelor’s Degree in Computer Science from KhNURE, while actively
developing technical skills through practical application. Eager to transition from academic and personal
projects to professional Android development and start a career as an Android Developer.

CONTACT
[відкрити контакти](див. вище в блоці «контактна інформація») • [відкрити контакти](див. вище в блоці «контактна інформація») • Telegram • Github • Djinni

SKILLS
Kotlin • Java • Jetpack Compose • Material3 • Agile • Firebase • Coroutines • GraphQL • REST API • Coil •
MVVM • Hilt • Koin • Retrofit • Spring WebFlux • WebSocket • PostgreSQL

DEVELOPMENT PORTFOLIO
Media Track GraphQL API Integration Project
Personal Project
Implemented data retrieval and management using Apollo GraphQL client;
Used Hilt for dependency injection;
Applied MVVM architecture for clean separation of concerns and maintainability;
Integrated ExoPlayer with custom controllers to display video content from external links.
Messenger Project (Spring Backend)
Personal Project
Created a messaging application with custom backend using Spring WebFlux and WebSocket;
Developed real-time communication between the Android client and the server using WebSocket;
Built UI with Jetpack Compose following Material3 design guidelines.
Messenger Project (Firebase Backend)
Personal Project
Developed a real-time chatting system using Kotlin, Jetpack Compose, and Firebase Firestore;
Implemented file-sharing functionality with Firebase Storage for image and document transfers;
Integrated Tenor GIF API using Retrofit for enhanced user experience;
Social Network Project
Collaborative Academic Project
Developed an application using Backendless;
Designed and implemented UI layouts using XML;
Used Jira for project management and team collaboration, applied Agile methodologies for feature
development and implementation;

EDUCATION
Kharkiv National University of Radioelectronics Sep 2021 - June 2025
Bachelor’s Degree in Computer Science