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Oleksandr – Android, Java, Kotlin, experts in Lemon.io

Oleksandr

From Ukraine (GMT+2)

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Mobile DeveloperSenior
Hire developer
9 years of commercial experience
Cybersecurity
Healthcare
IoT
Logistics
Transportation
Mobile apps
Platforms
Lemon.io stats
3
projects done
522
hours worked
Open
to new offers

Oleksandr – Android, Java, Kotlin

Oleksandr is an adaptable Android developer with a strong portfolio and over 7 years of commercial background mastering Kotlin. He has rich experience building app architecture, leading app development, and mentoring team members. He is particularly well-suited for Android and Kotlin Multiplatform projects.

Main technologies
Android
7 years
Java
7 years
Kotlin
7 years
Firebase
7 years
Additional skills
Retrofit
Coroutines
Realm
MVP
Koin
Dagger
BLE
Microsoft Azure
RxJava
JSON
OkHttp
Android Jetpack
WebRTC
Jetpack Compose
Unit testing
MVVM
CI/CD
Stripe API
Android SDK
REST API
Android Studio
AWS
Rewards and achievements
Tech interviewer
Client's favourite
Ready to start
ASAP
Direct hire
Potentially possible

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Experience Highlights

Senior Android Developer
Apr 2023 - Ongoing1 year 8 months
Project Overview

It is one of the most famous and biggest VPN apps on the market.

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Responsibilities:
  • Created common Updater SDK for all app flavors (playstore, samsung, sideload, amazon, vr, tv);
  • Worked with Android TV Jetpack Compose;
  • Debugged and resolved the advanced application issues;
  • Wrote unit, integration, UI, and screenshot tests;
  • Mentored team members regarding Jetpack Compose performance issues;
  • Fixed security issues on the encryption side.
Project Tech stack:
Android
Clean Architecture
Data Security
Kotlin
Jetpack Compose
Android Jetpack
Koin
MVVM
CI
CD
GitLab
Dagger
Hilt
RxJava
Coroutines
Android Studio
Android Software Engineer
Dec 2021 - Mar 20231 year 2 months
Project Overview

A national transportation company that connects passengers to affordable and convenient rides. You can request a ride in their app, and a driver from your community will arrive to give you a ride to your destination. Users of the app pay for their rides within the app using their smartphone.

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Responsibilities:

Oleksandr was a part of the Payments team, made up of 3 Android developers. His achievements included:

  • Rebuilding the tipping modules - resulting in 10% more tips from users;
  • Fixing payments-related issues;
  • Mentoring the newcomers;
  • Running tipping-related experimentations;
  • Adjusting accessibility of UI elements.
Project Tech stack:
Android
RxJava
Dagger
Kotlin
Jetpack Compose
REST API
Android Jetpack
Android Studio
Lead Android Developer
Oct 2020 - Nov 20222 years 1 month
Project Overview

On-demand delivery for businesses. Tech and logistics infrastructure to help enterprises scale delivery.

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Responsibilities:
  • Led a courier delivery app development process as a team lead;
  • Designed and implemented the app architecture (MVI - Redux);
  • Introduced GPS anti-cheat system that helped catch dishonest drivers;
  • Mentored a Junior developer.
Project Tech stack:
Android
Kotlin
Java
Dagger
Unit testing
Firebase
Redux
Coroutines
AWS
MQTT
Apollo GraphQL
Android Developer
Sep 2019 - Nov 20201 year 2 months
Project Overview

Application for managing IoT devices infrastructure.

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Responsibilities:
  • Was responsible for the entire IoT event system and data transfer;
  • Fixed advanced issues with BLE connectivity;
  • Learned about ZigBee protocol;
Project Tech stack:
Android
Koin
Realm
Kotlin
RxJava
BLE
Firebase
Microsoft Azure
Android Developer
Feb 2020 - Jun 20204 months
Project Overview

Mobile application which helps retrace a potential COVID-infected person.

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Responsibilities:
  • Implemented the concept of an algorithm to find the distance between Bluetooth devices;
  • Prepared the first PoC for the government client.
Project Tech stack:
Android
Kotlin
Koin

Education

2019
Information technology
Bachelor's

Languages

English
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