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, but with a strong theoretical foundation in Computer
Science and hands-on experience through multiple self-directed and collaborative academic projects.
Proficient in both Java and Kotlin, with practical application of modern Android development practices
including Jetpack Compose and XML layouts.Experienced in implementing real-time data synchronization,
user authentication, and integrating libraries such as Firebase, Retrofit, Apollo GraphQL and Hilt. Applied
MVVM architecture, dependency injection, and asynchronous programming with coroutines across various
personal projects. Currently pursuing a Computer Science degree at KhNURE while actively developing
technical skills through practical application. Eager to transition from academic and personal projects to
professional Android development, bringing solid technical foundations and a commitment to continuous
learning and growth.

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/MVI • Hilt • Retrofit • Spring WebFlux • WebSocket • PostgreSQL

DEVELOPMENT PORTFOLIO
GraphQL Integration Project
Personal Project
Implemented data retrieval and management using Apollo GraphQL client;
Used Hilt for dependency injection to improve code modularity and testability;
Applied MVVM architecture for clean separation of concerns and maintainability
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 a responsive UI with Jetpack Compose following Material3 design principles;
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 service using Retrofit for enhanced user experience;
Social Network Project
Collaborative Academic Project
Developed an application using Backendless as a Mobile Backend as a Service (MBaaS);
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 - Present
Bachelor’s Degree in Computer Science