Vadym B.
Private message 
Cherkassy,
Ukraine
available for hire
Rating
Language proficiency level
Українська: fluent
Русский: advanced
English: intermediate
CV
I am a Full-Stack Developer with experience in building web and mobile applications, CRM systems, SaaS platforms, and business solutions.
My primary technology stack includes React, React Native, Expo, Next.js, TypeScript, Node.js, NestJS, Redux Toolkit, PostgreSQL, MongoDB, Firebase, Prisma, WebSocket, and WebRTC.
I have experience developing mobile applications for iOS and Android, CRM systems, business process automation tools, geolocation platforms, payment integrations, subscription systems, analytics solutions, and real-time communication platforms.
I have worked with services such as Stripe, RevenueCat, Firebase, OneSignal, Mixpanel, AppsFlyer, and Google Maps Platform, which are widely used in modern SaaS products and mobile applications.
Recently, I have been actively focusing on AI Automation and AI Agents. I work with OpenAI, Claude, Codex, Cursor, and MCP-based approaches to automate business processes, support requirements analysis, generate documentation, and improve engineering productivity.
I enjoy solving complex technical challenges, designing system architectures, and building scalable products that deliver real value to businesses and end users.
Skills and abilities
Programming
- AI & Machine Learning
- Bot Development
- Cryptocurrency & Blockchain
- Data Parsing
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Databases & SQL
from 16 USD for hour
- HTML & CSS
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Javascript and Typescript
from 7 USD for hour
- Python
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Web Programming
from 13 USD for hour
Services
- AI Consulting
- Data Processing
- Enterprise Resource Planning (ERP)
- Information Gathering
- Online Stores & E-commerce
- Payment Systems Integration
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Website Development
from 11 USD for hour
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Website Maintenance
from 7 USD for hour
Photo, Audio & Video
Promotion
Mobile development
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App Development for Android
from 89 USD for day
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Apps for iOS (iPhone and iPad)
from 112 USD for day
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Hybrid Mobile Apps
from 112 USD for day
Administration
Outsourcing & consulting
Translation
Portfolio
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2000 USD Development of mobile applications for Android (React Native, Full-Stack)
Hybrid Mobile Apps
I specialize in mobile application development with a focus on Android (Google Play) — from idea to full release and ongoing support.
I implement the full development cycle: frontend, backend, integrations, and deployment.
Frontend (Mobile):
… React Native, Expo, TypeScript, Redux Toolkit, RTK Query, React Navigation, Reanimated, WebRTC
Backend:
Node.js, Express / NestJS, MongoDB (Mongoose), PostgreSQL (Prisma), REST API, WebSocket
Integrations and services:
Firebase (Auth, Realtime Database, Storage), Google Services, RevenueCat, Stripe, OneSignal, AppsFlyer, analytics (PostHog, Mixpanel), third-party APIs
Functionality:
Real-time (WebSocket), push notifications, authorization (OAuth), payments and subscriptions, media handling, analytics, complex business logic
Full development cycle for Android:
- task analysis and architecture design
- mobile application development
- backend development and API
- integration of third-party services
- testing and optimization
- preparation of builds (APK / AAB, EAS)
- publication on Google Play (Google Play Console, signing, releases)
Post-release:
- support and updates for the application
- bug fixes
- adding new functionality
- performance optimization
- scaling backend and infrastructure
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2000 USD Development of mobile applications for iOS (React Native, AI, SaaS, Mar
Hybrid Mobile Apps
I specialize in mobile application development with a focus on iOS — from idea to full release in the App Store and ongoing support. I have experience in creating complete solutions, including frontend, backend, and infrastructure.
Frontend (Mobile):
React Native, Expo, TypeScript, Redux Toolkit, RTK Query, React Navigation, Reanimated, WebRTC
…
Backend:
Node.js, Express / NestJS, MongoDB (Mongoose), PostgreSQL (Prisma), REST API, WebSocket
Integrations and services:
Firebase (Auth, Realtime DB, Storage), RevenueCat (subscriptions), Stripe, WayForPay, OneSignal, AppsFlyer, analytics (PostHog, Mixpanel, Sentry), third-party APIs
Functionality I work with:
Real-time (WebSocket), push notifications, authorization (including OAuth), payments and subscriptions, media handling, analytics, complex business logic
Full development cycle for iOS:
- task analysis and architecture design
- mobile application development
- backend development and API
- integration of third-party services
- testing and optimization
- preparing builds (EAS / Xcode)
- publishing in the App Store (App Store Connect, certificates, provisioning)
Post-release:
- support and updates for the application
- bug fixing
- adding new functionality
- performance optimization
- scaling the backend part
Reviews and compliments on completed projects 19
31 October 2025
116 USD
React Native
very well executed project
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31 March 2025
22 USD
Project consultation.
Quickly, efficiently, with quality.
10 February 2025
268 USD
React Native developer for working on the application. Onboarding in the application
Excellent work done. Everything is professional and communication is at a high level! It's a pleasure to work.
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2 January 2025
141 USD
Auth
Everything is great, the work was done efficiently and on time, with professional consultations.
I recommend for collaboration!
9 February 2024
11 USD
Help to set the development environment for the React Native app
Reacted quickly,, everything was fine.
29 January 2024
78 USD
Розробка IOS Аппки
Thank you for your work, as always quickly and well!
24 January 2024
78 USD
Розробка апп під IOS
Thank you for cooperation. It’s all fast and quality!
22 January 2024
78 USD
Applications under iOS
Thank you Wadi, quick and responsible, if there are questions, will help to deal with them.
23 October 2023
22 USD
Fix android emulator in vs code
That was great to work with Vadym
29 August 2023
45 USD
React Native JS - Mobile App #3
Vadim continues to impress with its professionalism and the speed of performing tasks. This is no longer our first project together, and every time the results exceed expectations. Wadiem not only responds quickly to any requests, but also knows how to clearly and clearly explain all technical details. His expertise in React Native and mobile development remains at an outstanding level. I strongly recommend Vadium as a reliable and experienced specialist!
26 August 2023
27 USD
React Native JS – mobile app #2
Wadiem affects the speed and quality of performing tasks. It responds quickly to messages and is accessible to explain difficult things. His skills in React Native and mobile development at the highest level. I recommend as a professional in my case.
24 August 2023
27 USD
React Native JS - Mobile App
Thank you for the work done! Your professionalism and quality at the highest level, the result has exceeded expectations. I want to note your skill in working with React Native and mobile applications – you have created a product for us that is not only functional but also visually attractive.
20 August 2023
22 USD
Students
There was a urgent need for help. He quickly responded and performed the task. and thank you.
18 August 2023
11 USD
Re-design of QR Scanner
It was a very responsible direction and literally a day for execution. In a few hours, Vadim was able to completely transform the application into design and functionality, in full compliance with the unpleasant conditions and taking initiative to almost every point of the TZ. Really saved Dudley!
I am very pleased with the collaboration and excellent communication with a specialist, I recommend it to everyone!
18 August 2023
11 USD
The QR Scanner Project
Excellent quality of code and visual!
A very tremendous approach to the project, there were short deadlines for the directions, but Vadim managed even earlier!
I am pleased with the collaboration and I recommend it!
15 August 2023
11 USD
Authorization through Google and Facebook
Everything is well. Rejoicing the Executive
14 August 2023
11 USD
Development of QR Scanner
We have worked with Vadim for a long time, we have not yet to doubt the professional approach of the specialist to each task!
Very good feedback and initiative participation in many decisions.
A specialist can be confident with a responsible project/simple task and be confident in the quality result.
I recommend !
22 December 2022
11 USD
Posts Tagged Next.js
very satisfied. A lot of useful information more than expected! thank you
22 December 2022
4 USD
Create authorization on the site using Action.Signature
Incredibly good and professional work. Excellent communication in the built-in work. The Super
Activity
| Latest proposals 10 | Budget | Added | Deadlines | Proposal | |
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Development of a mobile application for MakeUp
602 USD
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Telegram Mini Apps application (WebView + multilingualism)
446 USD
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Full Stack Developer Needed
5000 USD
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React / Next.js Developer for Existing Platform(Remote)
12 000 USD
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Business Suggestion for Software Development
500 USD
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Mobile application (online clothing store)
602 USD
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Turnkey WebView application for the iGaming vertical
89 USD
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Creation of a membership application for the organization on iOS and Android
446 USD
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React Native developer for the development and support of a mobile application
223 USD
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Creation of a responsive web calculator for calculating paint proportions
446 USD
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