Andrey Kovalchuk
Private message
Offer work
Ukraine
available for hire
Rating
Skills and abilities
Programming
- Databases & SQL
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HTML & CSS
from 2 USD for hour
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Javascript and Typescript
from 2 USD for hour
- Python
- Web Programming
Design & art
- Banners
- Logo Design
- Mobile Apps Design
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Web Design
from 2 USD for hour
Services
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Online Stores & E-commerce
from 2 USD for hour
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Website Development
from 2 USD for hour
- Website Maintenance
Mobile development
- App Development for Android
- Apps for iOS (iPhone and iPad)
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Hybrid Mobile Apps
from 3 USD for hour
Portfolio
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Bossaball Arena — Sports Tracking Mobile App (UI/UX + React Native)
Hybrid Mobile Apps
Bossaball Arena is a modern sports tracking mobile app that helps users monitor their performance, match statistics, and achievements. The design focuses on clarity, motivation, and engagement through a clean layout and vibrant gradients.
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German App
German Learning App
A modern mobile application for learning German, designed for both kids and adults.
… Key Features:
Interactive alphabet and vocabulary training
Progress tracking and exam statistics
Gamified learning with visual elements and rewards
In-app purchases to unlock categories and remove ads
Tech stack:
React Native – cross-platform mobile development (iOS & Android)
Firebase – user authentication, real-time database, and cloud storage
This app combines beautiful UI, smooth animations, and practical learning features, helping users quickly improve their German vocabulary in an engaging way.
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Kaspi AI Invest – Landing Page
Kaspi AI Invest – Landing Page
A modern promotional website for an AI-powered investment platform.
… Key Features:
Clean and dynamic landing page design
Highlight of platform benefits and features
Clear CTA elements for user engagement
Responsive layout with smooth UI/UX
Tech stack:
React.js – component-based, scalable front-end
TypeScript & JavaScript – reliability and flexibility
HTML/CSS/Bootstrap – responsive and modern design
Firebase / API integration (for data and forms)
The project goal was to create a fast, attractive, and conversion-oriented website that introduces users to the investment platform and motivates them to sign up.
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Home Location
Hybrid Mobile Apps
Task:
Our real estate search and purchase program has been on the market for some time and has gained popularity among users. However, for further development and attracting new clients, we have decided to improve the functionality of the program, particularly by expanding the capabilities of viewing real estate on the map.
Goal:
… To optimize the process of real estate search and purchase, allowing users to easily find and select properties using a map interface.
Solution:
Adding map functionality: We will expand the program to allow users to view available real estate on a map.
Highlighting properties: We will add the ability to highlight properties on the map so that users can quickly and easily find and view information about them.
Price comparison: We will develop functionality that allows users to compare prices for different properties directly on the map and choose the one that best fits their budget.
Results:
After upgrading the program, users will have the ability to easily and conveniently view real estate on the map, compare prices, and make purchases with minimal effort. This will attract new clients and increase satisfaction with the program.
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Mobile Sneaker Store
Hybrid Mobile Apps
Task:
Our sneaker internet store, developed for mobile platforms using React Native, is already successfully operating in the market. However, to increase competitiveness and improve the user experience, we have decided to enhance the program's functionality.
Goal:
… To optimize the mobile sneaker internet store, providing a convenient and attractive interface and functionality for users.
Solution:
Improving User Interface: We will review and enhance the design of the user interface, ensuring convenience and aesthetic appeal for customers.
Loading Speed Optimization: We will refine the program to reduce page loading time and improve overall performance.
Adding New Features: We will develop new features such as search filters, the ability to save favorite items, and product recommendations based on previous purchases.
Integration of Payment Systems: We will add support for various payment systems to streamline the purchasing process for customers.
Results:
After upgrading the mobile sneaker internet store, users will receive an improved and more functional application that will provide them with a pleasant and convenient shopping experience. This will contribute to increased sales and customer satisfaction with the program.
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The Internet Store
Web Programming
List of Internet Store
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The Internet Store
Web Programming
List of Internet Store
Reviews and compliments on completed projects 9
31 January
451 USD
Instpril
Everything is fast and of high quality. I will reach out again.
18 December 2025
75 USD
React native app fixes/improvements
I made edits and improvements to the react native project.
I completed more than we planned and everything very quickly!
We will continue to collaborate!
100% recommend!
6 November 2025
451 USD
Intprila
Everything is cool, fast, and of high quality! I recommend.
28 August 2025
595 USD
IOS Intfoto
Everything is cool, fast, and of high quality.
18 February 2025
452 USD
Mobile application - book reader (core functionality)
Very well started, but something happened towards the end.. The same bugs occurred time and again. Didn't quite meet the deadlines.
But overall, I am satisfied with the collaboration. It is clear that he knows his stuff, offers different implementation options, and I was pleased with the communication.
We will cooperate in the future.
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17 January 2025
180 USD
React Native application is simple with a few screens. No API.
Thank you for the great work. I will reach out again.
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1 August 2024
11 USD
Add functionality to the already created project (iOS + Android) React Native2
Everything is done as we agreed.
29 July 2024
92 USD
iOS app design
Thank you for the design. Quick, nice, stylish + everything according to the specifications. Quick interaction.
9 July 2024
27 USD
Add functionality to an already created project (iOS + Android)React Native
The task was completed quickly and qualitatively!
I recommend for cooperation!
Activity
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Looking for a UI/UX mobile designer
23 USD
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Development of a mobile application based on an existing online store
564 USD
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Development of a mobile application for MakeUp
23 USD
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Reformat page 1 to 1
29 USD
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React / Next.js Developer for Existing Platform(Remote)
12 000 USD
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Development of a landing page for iGaming to launch campaigns in UAC
23 USD
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Development of a web application (MVP, first version of the product)
100 USD
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Need a developer Nodejs, Nestjs + MongoDB & Postgre
116 USD
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Telegram Mini Apps
23 USD
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Design of a mobile game according to the technical specifications and promotional images for the market.
23 USD
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