Denis Oleynik
Private message 
Kyiv,
Ukraine
temporarily not working
Rating
Language proficiency level
Українська: fluent
Русский: fluent
English: upper-intermediate
CV
Unity and Android developer with 5 years of experience. Created over 100games based on specifications and ddl, receiving positive feedback andrecommendations from clients. Specialization: hyper-casual games, AR, serversolutions, mechanics, interface animations, localization, API, and Firebase.English proficiency at B2 level – I can discuss project details fluently, resolveclient issues, and provide technical explanations. I am looking for a companywhere I can develop stable and functional games that meet modern technicalstandards and client requirements, stand out in the market, generate profit,and attract new users.
Skills and abilities
Programming
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AR & VR Development
from 94 USD for day
- Bot Development
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C & C++
from 16 USD for hour
- C#
- Data Parsing
- Databases & SQL
- Desktop Apps
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Gaming Apps
from 94 USD for day
- HTML & CSS
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Java
from 17 USD for hour
- Javascript and Typescript
- Python
- Testing & QA
- Web Programming
Mobile development
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App Development for Android
from 11 USD for hour
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Hybrid Mobile Apps
from 129 USD for day
Portfolio
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Demo of slots
Slot for casino
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CandyRush
Gaming Apps
"CandyRush" – a delightful twist on the classic 2048 game set in a colorful candy world! Dive into a sugary adventure where every tile is a vibrant treat – from lollipops and caramels to gummy bears. Instead of numbers, you’re merging sweets to create even more tempting combinations, aiming for the ultimate candy prize hidden within the highest match! Slide, combine, and double up your candies, bringing you closer to the peak of candy paradise with each move. Candy Fusion 2048 is perfect for puzzle lovers and candy fans alike, delivering sweet satisfaction and endless fun!
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Liquidator
Gaming Apps
Project description: Liquidator is a hyper-casual shooter where the main task of the player is to dodge bombs in a rapidly changing environment. The game features simple mechanics, challenging levels, and intuitive controls, designed for short and engaging gaming sessions. Independently developed Liquidator, a hyper-casual shooter with challenging levels and intuitive controls. Integrated advertising and optimized performance for smooth operation on mobile devices.
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Safe Hamsters League
AR & VR Development
Project description: a mobile AR game where players control and battle virtual hamsters in an augmented reality environment. It features combat on a multiplayer arena and customization options for hamsters.
Responsibilities:
Successfully created a game prototype that was well received by clients, laying the foundation for the final version of the game.
Managed the development of Safe Hamsters League, a mobile AR game, from prototype to release including combat on a multiplayer arena and 3D model animation.
… Developed server systems using Firebase, significantly improving scalability and providing real-time multiplayer features.
Developed core gameplay mechanics and customized 3D animation, enhancing player interaction with realistic, responsive elements of gameplay, inventory system, and character customization, improving player engagement and personalization.
Created a dynamic arena based on augmented reality, providing an immersive augmented reality experience that heightened player engagement.
Redesigned project architecture, optimized core gameplay mechanics for server-side performance and smoother interaction with multiple players, ensuring a seamless experience for users.
Implemented a leaderboard system, encouraging player competition and increasing retention.
Reviews and compliments on completed projects 7 2
14 May 2025
23 USD
Creating the game Shape Switcher
Constantly in touch, shows interest in the project and offers his ideas for its improvement! Did the work wonderfully!
9 May 2025
113 USD
Refinement and adjustment of individual game components for a mobile game
The tasks are implemented in accordance with the technical specifications, and a description of the completed work with explanations has been provided, good job
11 November 2024
1165 USD
SMS/Push application from phone (Android) to Telegram
Denis has always been in touch, also provides a 1-year guarantee for corrections)) He completed his work, there were some shortcomings, but he successfully fixed them, I recommend him for collaboration.
22 October 2021
112 USD
Менеджер обоев
Initially, he agreed to take the project started working in the middle of the project and rejected the completion of the project.
3 June 2021
51 USD
Реализовать авторизацию для мобильного клиента на Unity (С#)
Due to the fact that Denis had a delay in the first project, I couldn’t take a long time to complete. As a result, the deadlines were very delayed. I couldn’t wait anymore, as the deadlines were critical for us, so we agreed that we’d be looking for another artist.
Denis was always in communication, in communication and communication everything was great!
5 January 2021
32 USD
ТЗ Механика
Работа выполнена в срок.
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13 October 2020
11 USD
Подписать и сделать релиз приложения
Работает быстро, рекомендую!
8 October 2020
27 USD
Sign up and make a release version of the app for Google Play Marker
It was done as I wanted, I recommend.
| Response review
30 September 2020
23 USD
Сложить и перемножить многочлены в linked list на JAVA
Thank you very much for the work!The !
Activity
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Material Volume Calculator
23 USD
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Android Widget
100 USD
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Creating the game Shape Switcher
23 USD
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Creating a simple game on Android
23 USD
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Image editor in Unity Editor
75 USD
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Freelance project
609 USD
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Freelance project
90 USD
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Freelance project
16 USD
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Freelance project
165 USD
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Freelance project
113 USD
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