Олег

Oleg Opalko
Mobile Developer
Ukraine

PROFILE

I am a Mobile Developer with a solid background in Xamarin, .NET and
Android/iOS platforms, TVs. I have more than 3 and half years of hands-on
experience in development of cross-platform mobile applications for a number
of industries - from scratch to publishing in stores and support. With decent
problem-solving skills and a technical background, I have successfully
accomplished all phases of software development on numerous projects, and
I am willing to move forward, broaden my practical experience and develop
top-notch software solutions.

TECHNICAL SKILLS

Programming languages C#, Kotlin
Mobile platforms Android, iOS
Xamarin Xamarin Native, Xamarin.Forms,
MVVMCross
Frameworks ASP.NET Web API, Entity
Framework Core, PostgreSQL,
Prism, Refit, SignalR
IDE and tools Visual Studio for Mac/Windows,
familiar with Android Studio, XCode
Version Control Tools Git

EXPERIENCE

07/2024 - 09/2024 Xamarin developer
Customer: German Project

Project description: An app for booking massage therapists, spa treatments, and various
courses
Tools and technologies: C#, Xamarin.Forms, MVVMCross, Refit

Responsibilities:
- fixed existing bugs in the app
 - added filters to the custom weekly and daily calendar
- fixed the behavior of rendering bookings on the custom calendar
- fixed Azure pipeline for new builds
- published new versions on the Play Market and App Store

05/2023 - 02/2024 Android developer
Customer: Israeli startup

Project description: 24/7 video streaming application for Android TV
Tools and technologies: Kotlin, Retrofit, SignalR
Responsibilities:
- developed application Android TV using Kotlin from scratch
- requirements analysis, communication with the client
- integrated SignalR real-time service
- implemented persistent storage for videos and images
- streaming videos using ExoPlayer
- optimizing application to work 24/7

10/2021 - 03/2023 (08/2023 – 12/2023 part-time) Xamarin developer

Customer: A USA-based company specializing in fitness and yoga

Project description: Video streaming applications for iOS/Android platforms, Apple
TV and Android TV, Fire TV, Roku.
Tools and technologies: C#, Xamarin.Forms, MVVMCross, Roku

Responsibilities:
- developing and supporting Android/iOS mobile applications and Apple TV,
Android TV, Fire TV, and Roku TV apps using both Xamarin.Forms, MVVMCross
frameworks, Roku
- requirements analysis, communication with the client

- app delivery and distribution
- integrating Deep Links for mobile applications
- developing video streaming

06/2020 - 09/2021 Xamarin developer

Customer: Ukrainian startup

Project description: Mobile application for agricultural products marketplace

Tools and technologies: C#, Xamarin.Forms, ASP.NET Core Web API, Elasticsearch
Responsibilities:
- integrating Push Notifications and Deep Linking

- support of server side developed with ASP.NET Core Web API

- integration with Elasticsearch.

01/2020 - 05/2020 .NET developer

Customer: Large Ukrainian factory

Project description: Software system for electricity usage monitoring and reporting on
large production of linoleum
Tools and technologies: C#, Xamarin.Forms, ASP.NET Web API, Entity
Framework Core, PostgreSQL
Responsibilities:
- developing and support of ASP.NET Web API with Entity Framework Core
and PostgreSQL on board
- developing C# application hosted on RaspberryPi for reading data from
electricity meters using DLMS protocol
- developing Xamarin applications for iOS and Android mobile platforms to
display electricity usage reports

10/2019 - 01/2020 Xamarin developer

Customer: A USA-based startup

Project description: Mobile application for managing tasks and meetings

Tools and technologies: C#, Xamarin.Forms, Prism, Refit

Responsibilities:
- developing UI using Xamarin.Forms and integration with REST API using Refit

EDUCATION
Master’s degree in Computer Science, West Ukrainian National University

ENGLISH: B1+