Oleksandr – Android, Java, Kotlin

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

• 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.

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.

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.

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

• 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.

Application for managing IoT devices infrastructure.

• Was responsible for the entire IoT event system and data transfer;
• Fixed advanced issues with BLE connectivity;
• Learned about ZigBee protocol;

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

• Implemented the concept of an algorithm to find the distance between Bluetooth devices;
• Prepared the first PoC for the government client.