Volodymyr Kovalchuk
Private message 
Offer work 
Kropivnitskiy,
Ukraine
available for hire
Rating
Language proficiency level
Українська: fluent
Русский: fluent
English: upper-intermediate
Skills and abilities
Mobile development
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App Development for Android
from 9 USD for hour
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Apps for iOS (iPhone and iPad)
from 11 USD for hour
Administration
Portfolio
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Intelligent hashtag assistant
Apps for iOS (iPhone and iPad)
Project description:
Taglo is an iOS app that helps users find relevant hashtags for social media posts. The user enters a word, phrase, or uploads an image, and the app contacts the backend, where AI-based analysis is performed and ready hashtag recommendations are returned.
Key features:
… • Text or image input for hashtag search.
• Interaction with REST API to get results from the server.
• Display of recommended hashtags with one-tap copying.
• Modern and intuitive interface, fully implemented in SwiftUI.
• MVVM architecture for clean, structured, and easily scalable code.
My involvement:
• Full implementation of the client-side of the app (UI, logic, network requests).
• Development of architecture using the MVVM pattern.
• Integration with the existing API for request processing and result retrieval.
• Creation of UX/UI according to modern iOS design principles.
• Working with asynchronous operations via Combine and handling loading/error states.
#swift #mvvm #combine #swiftui #coredata
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Smart Code Scanner
Apps for iOS (iPhone and iPad)
Smart Code Scanner
Native iOS App built with SwiftUI & MVVM
Smart Code Scanner is a modern iOS application designed to effortlessly scan and generate QR codes and barcodes.
…
Built using SwiftUI and the MVVM architecture, the app provides a fast and intuitive user experience, allowing users to:
• Instantly scan QR codes and barcodes using the device camera
• Recognize codes from photos in the gallery
• Generate custom QR codes for text, URLs, contacts, and more
• Easily copy, save, or share scanned or generated results
The interface is clean, responsive, and optimized for smooth daily use.
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AI Homework App
Apps for iOS (iPhone and iPad)
AI Homework
Native iOS app on SwiftUI
AI Homework is an intelligent assistant for students, schoolchildren, and everyone who works with text.
… The app is built from scratch on SwiftUI and integrated with the official OpenAI API, allowing a wide range of tasks:
• generate and edit texts;
• check grammar and style;
• create summaries;
• translate;
• write essays, letters, social media posts;
• prepare for interviews;
• send images for analysis;
• conduct free-form conversations with AI in a dedicated chat.
Dialogue history is stored locally for easy return to previous sessions.
The project is implemented with a focus on stability, modern UI/UX, and deep integration with GPT model capabilities.
#swiftui #mvvm #openai #chatgpt
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Alarm Map Widget
Apps for iOS (iPhone and iPad)
its own project.
The map of the trembling on the screen of the smartphone
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Alarm Map Widget
App Development for Android
its own project.
The map of the trembling on the screen of the phone.
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Mobile app for AI Wallpapers
Apps for iOS (iPhone and iPad)
I have developed an app on order to install or download the spaller on the smartphone.
He developed a mobile and server ashton.
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We take promptly and without refusal
App Development for Android
Development of the application prototype.
Fasebook SDK, Firebase (Database + Storage)
#Androd #java #Firebase #FacebookAPI
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68 USD Sports forecasts - 2018
App Development for AndroidAppendix for Sports Events.
Advertising on PHP.
He developed the front and bake himself.
(Blocked by Google Policy)
… #xml, #java, #Android, #mysql, #php
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45 USD Sports forecasts
App Development for AndroidBlocked by Google Policy
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SportsInfo
App Development for Android
Information about sports events.
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Sports betting
App Development for Android
Sports forecast project.
Reviews and compliments on completed projects 42 2
28 May 2025
474 USD
iOS application
All good
I recommend Volodymyr
22 May 2025
474 USD
iOS application Homework Helper on ChatGPT API
Great job, everything as agreed
1 February 2025
496 USD
Development of QR Reader & Generator application
The project is completed, thank you for your cooperation!
28 November 2024
350 USD
Create app to Iphone
Great work
Aaaaaaa+++++ aaaaa
15 October 2024
90 USD
Develop a Bluetooth terminal for Android with support for Android 5 to 14
I need to write something, I need to write something. But what to write, I don't know what to write.
8 October 2024
92 USD
Subscription payment
Excellent execution! I recommend for collaboration!
6 October 2024
90 USD
Adaptation of the project "Bluetooth-HC-05-Terminal" for Android 13
Everything was done according to the specifications and in a short time. I recommend for collaboration as a professional in their field.
2 October 2024
50 USD
Added app to google play
great work
AAA+++
did it fast
2 October 2024
100 USD
Update app. that so it would appear in Google play. and Create same one for app store,
great work
super fast AAA+++
4 August 2024
11 USD
Corrections in the program
Excellent execution! I recommend for collaboration!
27 June 2024
90 USD
Edits for iOS application
The work has been successfully completed.
26 June 2024
361 USD
An application in Swift for recording fitness tracker data in HealthKit
The work has been successfully completed.
8 June 2024
11 USD
Edits in the program
Completed the edits quickly and clearly. I recommend for collaboration!
8 June 2024
11 USD
Add the iPhone application to testflight (yours)
Great performer, helped at every stage, gave a lot of advice. I recommend for cooperation!
13 April 2023
23 USD
Change and Preparation for iOS App Release
The project is done and I’m happy with the result. I recommend the executive to cooperate.
17 August 2022
1420 USD
Correction of bugs in the iOS application (swift)
Владимир непрофессионально подошел к выполнению заказа, срок сорвал, практически ничего по заданию не выполнил, на связь не выходил.
16 February 2022
39 USD
Enter the log of the visited links in WebView on Android Studio
With Vladimir, the results are very quickly achieved.
| Response review
6 February 2022
61 USD
Download photos and files to WebView on Android Studio
Successfully performs important functions.
Applying Java and Kotlin, it is a great opportunity to support any projects.
| Response review
31 December 2021
23 USD
Android app for mass removal of Bluetooth devices
The project had to be closed because of the iron restrictions on my phone. The app is made and works on more new versions of Android. But in this way, unfortunately, it has no sense for me. Vladimir was a young man, trying to help and understand to the last. Responsibility and communicability at a high level.
18 July 2021
102 USD
Астрологическое приложение для iPhone на Swift
After a series of promises, the project was never completed, most likely never started.
| Response review
28 June 2021
56 USD
and development. and Android. The fashion. by Java/Kotlin
The project is done quickly, pleasant to collaborate!The !
23 June 2021
56 USD
and development. and Android. The Applications. The fashion. by Java/Kotlin
The project is done well, pleasant to collaborate!
4 June 2021
56 USD
You need to implement a mobile app on Android.
Good implementation of the project, I recommend cooperation!
18 May 2021
90 USD
and development. and Android. The Applications. The scenes. by Java/Kotlin
The work is well done, I recommend cooperation!The !
The task is well done, I recommend cooperation!The !
25 March 2021
34 USD
Kotlin доработка мобильного приложения
Надежный и исполнительный фрилансер.
Приятно иметь дело.
19 March 2021
90 USD
Разработка. Андроид приложения модов. на. Java/Kotlin
Рекомендую к сотрудничеству!
| Personal | Response review
9 March 2021
158 USD
Разработчик Android и iOS (приложение с нуля)
Отличный исполнитель, настоящий профи своего дела. Все пожелания были учтены, результат выше моих ожиданий. Рекомендую всем. Спасибо большое!
28 January 2021
113 USD
Android design app on Figma
Thank you for good work. Vladimir in connection. It works quickly, quality, even with its improvements that we did not hesitate to predict at the stage of the TZ setting.
22 January 2021
45 USD
Приложение-игра под iOS — персональный проект для Владимира Ковальчука
Все выполнено быстро и качественно. Будем работать!
19 January 2021
31 USD
Create the Java processor/partser function of the UTM mess in the link to the site
Successfully set up the UTM melt processing feature that allows the mobile application to track traffic sources from the Play Market, now we are able to determine where users will learn about the application.
| Response review
17 January 2021
102 USD
Correction of an Android Studio error - JsonTask
He fixed the problem in the project, proposing a new method of solution.
This is what we were looking for.
| Response review
8 January 2021
45 USD
Publication of iOS Application
I strongly recommend cooperation. 4 “specialists” could not introduce my application before this, Vladimir decided everything for a number of days. The master of his business, who clearly discovers and fulfills the task. I will be happy to work further!
27 December 2020
45 USD
Push notification with Firebase android java
greatly ! Everything at the highest level!
30 November 2020
90 USD
Разработка ANDROID приложения в Java / Kotlin
Хорошая работа по выполнению! Рекомендую
| Personal | Response review
21 November 2020
45 USD
Разработка приложение на Андроид
Доплата за переделывание по моей просьбе!
| Personal | Response review
21 November 2020
90 USD
Android приложение на Java / Kotlin
Хорошая работа! Все трудности были преодолены! Рекомендую!
| Personal | Response review
27 October 2020
90 USD
Android приложение на Java / Kotlin
Отличная работа! Ни единого бага! Рекомендую!
| Personal | Response review
22 August 2020
88 USD
SWIFT, mobile application
satisfied with work. It is worth noting that Vladimir even introduced a few moments that were not in the TZ. He has done additional work. He explained uncomprehensible moments and explained everything in detail. Some of the TZ moments were not implemented, but everything was immediately corrected. Therefore there are no problems. We will work further.
| Response review
14 July 2020
36 USD
You need to use the jwt token verification app.
I did everything in the best way with a really high level of implementation of the project. I strongly recommend cooperation.
| Response review
5 April 2020
6 USD
Fixing of Android
Thank you for the successful implementation of the project! I recommend Vladimir as a professional and responsible executive!
17 January 2019
2 USD
Porting calculators to javascript in the React Native app
I highly recommend Vladimir as an experienced, erudited and proactive specialist. So it came out that this project had to work with the legacy code. Everything is done very well. In addition, I am grateful to Vladimir for the audit of the “high places” in the project.
We continue our work now.
29 May 2018
2 USD
Access to the existing .GDB database
The executor is very pleased!
11 April 2018
36 USD
Toughened Laminated to the finished Android mobile app
The project was done very quickly. There were delays from my side, the executive treated them with understanding, solve problems and difficulties not related to the project (help with the server) I recommend, great executive!
| Response review