Olha – Clean Architecture, Retrofit, Kotlin, experts in Lemon.io

Olha

From Poland (UTC+2)flag

Mobile Developer|Senior

Olha – Clean Architecture, Retrofit, Kotlin

Senior Android Developer with 10+ years of experience building and maintaining mobile applications and SDKs. Strong expertise in Kotlin, Jetpack Compose, Coroutines, Flow, Clean Architecture, and MVI. Experienced in designing application architecture, developing complex features from scratch, improving existing codebases, and delivering production-ready solutions. I also have cross-platform experience with iOS, Flutter, and React Native, as well as experience mentoring developers and participating in technical interviews.

10 years of commercial experience in
E-commerce
Healthcare
Healthtech
Sports
Main technologies
Clean Architecture
8.5 years
Retrofit
11.5 years
Kotlin
10.5 years
MVVM
7.5 years
Jetpack Compose
5.5 years
Coroutines
5.5 years
Android SDK
11.5 years
Java
9.5 years
Android
11.5 years
Additional skills
RxJava
RxKotlin
Flutter
Azure DevOps
Protobuf
Dagger
MVP
Material Design
Realm
BLE
SQLite
Firebase
MVC
Dart
Direct hire
Possible
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Experience Highlights

Senior Android Developer
Apr 2024 - Ongoing2 years 5 months
Project Overview

Cross platform development of health product Android application.

Responsibilities:
  • Developed new features for the Android application.
  • Improved code architecture.
  • Improved testability and observability.
  • Performed code reviews.
  • Participated in creating new features at all stages of planning and development.
  • Conducted technical interviews for Android.
  • Contributed to cross-platform development.
  • Performed A/B testing.
  • Spec Driven AI Development.
Project Tech stack:
Android SDK
Kotlin
Clean Architecture
Coroutines
Retrofit
Jetpack Compose
MVVM
React Native
Unit testing
Integration Testing
UI testing
e2e testing
Firebase Analytic
Google Analytics
Claude Code
Cursor
GPT
Google API and Services
Networking
Senior Software Engineer, Android and Flutter Developer
Jan 2021 - Apr 20243 years 3 months
Project Overview

E-commerce big projects.

Responsibilities:
  • Developed e-commerce projects.
  • Developed an internal Flutter project.
  • Performed code reviews.
  • Fixed bugs.
  • Refactored code.
  • Clarified requirements.
  • Estimated features.
  • Conducted technical interviews for Android and Flutter projects.
  • Managed small teams of 2-3 developers.
  • Mentored interns.
  • Collaborated with developers from other teams and platforms.
Project Tech stack:
Android SDK
Flutter
Java
Kotlin
Clean Architecture
MVVM
Retrofit
RxJava
RxKotlin
Coroutines
Jetpack Compose
UI testing
RoomDatabase
OkHttp
Google Maps API
Senior Software Engineer, Android Developer
Jul 2020 - Dec 20205 months
Project Overview

Development of a secure and encrypted application for video conferences.

Responsibilities:
  • Developed base features such as a custom conference screen view, screen sharing, and bad connection handling.
  • Fixed bugs.
  • Refactored code.
  • Clarified requirements.
  • Estimated features.
  • Collaborated with developers from other teams and platforms.
Project Tech stack:
Android SDK
Kotlin
Retrofit
Azure DevOps
RxKotlin
Android Developer
Feb 2016 - Jun 20204 years 4 months
Project Overview

Development of a shop on-line enterprise application.

Responsibilities:
  • Developed base features such as checkout order, quick buy, loyalty program, and others.
  • Fixed bugs across the whole application.
  • Clarified requirements.
  • Estimated features.
  • Performed code reviews.
  • Onboarded new colleagues.
  • Conducted technical interviews in Russian and English.
Project Tech stack:
Android SDK
Java
Kotlin
Clean Architecture
MVVM
Dagger
Retrofit
Gson
Protobuf
RxJava
XML
Android Developer
Jan 2015 - Jun 20194 years 5 months
Project Overview

App that connects user with some medical portable devices for treating snoring or heart rate measuring

Responsibilities:
  • Developed Android applications using client-provided server side.
  • Clarified requirements.
  • Estimated features.
  • Developed functionality as a single developer or as part of a small team.
Project Tech stack:
Android SDK
Java
Retrofit
MVC
MVP
Material Design
SQLite
Realm
BLE
Firebase

Languages

Polish
Intermediate
Ukrainian
Advanced
Russian
Advanced
English
Advanced

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