You will get a responsive, SEO-friendly website tailored to your business needs
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Top Rated
Project details
As an experienced web developer, I build responsive website development solutions that are fast, secure, scalable, and tailored to your business goals. Whether you need a custom website, business website, or modern web application, I create polished digital experiences that work seamlessly across all devices.
What I offer:
š± Responsive web design for desktop, tablet, and mobile.
ā” Performance-optimized websites built for speed and efficiency.
š Secure web development with strong protection practices.
š ļø Custom website development with tailored features and functionality.
š SEO-friendly web design to support search visibility.
š Full-stack web development for front-end and back-end needs.
š Scalable website solutions designed for long-term growth.
šÆ User-focused development aligned with your business objectives.
With a strong focus on custom web development, responsive design, SEO optimization, and performance, I create websites that not only look professional but also support engagement, conversions, and business growth. From planning and development to launch, I help turn your vision into a reliable, future-ready website.
What I offer:
š± Responsive web design for desktop, tablet, and mobile.
ā” Performance-optimized websites built for speed and efficiency.
š Secure web development with strong protection practices.
š ļø Custom website development with tailored features and functionality.
š SEO-friendly web design to support search visibility.
š Full-stack web development for front-end and back-end needs.
š Scalable website solutions designed for long-term growth.
šÆ User-focused development aligned with your business objectives.
With a strong focus on custom web development, responsive design, SEO optimization, and performance, I create websites that not only look professional but also support engagement, conversions, and business growth. From planning and development to launch, I help turn your vision into a reliable, future-ready website.
Programming Languages
JavaScript, ASP.NET, Ruby/Ruby on RailsCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$1,400
|
Standard
$4,500
|
Advanced
$9,000
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 15 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | |||
Source Code |
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Open R.
May 31, 2026
Technical Discovery Services for Mobile IoT Platform
Vitalii provided excellent technical discovery services for our mobile IoT platform. He brought genuine technical depth, understood the problem quickly, and delivered a clear, well-considered assessment that set us up well for the next phase. Communication was responsive and professional throughout. Highly recommended, and I'd happily work with him again.
AO
Art O.
Apr 22, 2026
Payment Integration for Pool Wristband Charging System
Vitaly is great to work with
RV
Ronny V.
Apr 10, 2026
.NET MAUI Developer for Desktop App (Windows & MacCatalyst)
We had an excellent experience working with DevsX. Their team provided deep technical expertise in addressing issues related to our defect code signing certificate and guided us seamlessly toward transitioning to Azure code signing. Their knowledge in this area was both thorough and practical, helping us move forward with confidence.
In addition, DevsX brought valuable .NET MAUI expertise to our desktop application, offering clear insights and effective solutions that improved both development efficiency and overall app performance.
What truly stood out was their proactive and solution-oriented approach. They anticipated challenges, communicated clearly at every step, and were consistently responsive to our needs. Their professionalism and top-notch communication made collaboration smooth and highly productive.
We highly recommend DevsX to any team looking for reliable, knowledgeable, and forward-thinking technical partners.
In addition, DevsX brought valuable .NET MAUI expertise to our desktop application, offering clear insights and effective solutions that improved both development efficiency and overall app performance.
What truly stood out was their proactive and solution-oriented approach. They anticipated challenges, communicated clearly at every step, and were consistently responsive to our needs. Their professionalism and top-notch communication made collaboration smooth and highly productive.
We highly recommend DevsX to any team looking for reliable, knowledgeable, and forward-thinking technical partners.
AK
Abduljalil K.
Mar 26, 2026
Full stack app development for AI B2C project
MS
Marc S.
Feb 17, 2026
Senior Product Manager / UX & Usability Expert for AI-First Agents & Bots
Vitalii is a pleasure to work with. Very solution orientated, a good listener and ambitious to push his skills to provide you with a perfect end solution. I can only highly recommend working with him and I would rehire him without a doubt in my mind.
About Vitalii
Full Stack Mobile App Developer | Flutter Developer | MAUI
100%
Job Success
Lutsk, UkraineĀ - 12:07 pm local time
Iām a Flutter developer, mobile app developer, full stack developer, and web developer with 8+ years of experience building, fixing, and scaling mobile products for startups and growing companies. My work spans mobile app development, web development, and backend-connected product work, with a strong focus on clean architecture, smooth user experience, reliable delivery, and scalable app development.
Iāve worked across Flutter, Flutter Dart, Flutter Firebase, React, React Native, Xamarin developer projects, Xamarin Forms, Xamarin.Forms, .NET MAUI developer builds, Swift developer work, SwiftUI, iOS, Android, iOS developer tasks, iOS Swift, Android developer tasks, Android Kotlin, Kotlin, native app developer projects, AI app development, MVP development, API integration, and cross platform mobile app architecture. I also support teams that need a practical full stack developer who can connect mobile apps with APIs, dashboards, cloud services, and web systems without slowing the project down. That mix of mobile app development and web development lets me work across the full product, not just one part of it.
On Upwork, Iāve delivered 50+ projects, earned $800K+, and worked 20,000+ hours helping clients launch MVPs, modernize old apps, fix unstable codebases, and move products into production. That experience taught me how to balance speed with quality, especially when a project needs to ship quickly but still be stable enough for real users. It also taught me how to work with different teams, different product stages, and different technical constraints without losing momentum.
For new products, I help with MVP development from concept to launch. For existing products, I step in to improve architecture, refactor weak areas, and make the app easier to maintain and scale. If youāre building a cross platform mobile app, I can help choose the right direction between Flutter, React Native, .NET MAUI, Xamarin migration, or native app development depending on the product goals, timeline, and long-term plan. I focus on making those choices practical, not trendy, so the app can grow without becoming harder to manage.
Iām also a strong fit for AI app development projects where the product needs more than a basic interface. That might mean smart workflows, automated actions, backend logic, or API integration that connects the app to real business systems. In those projects, I pay close attention to stability, data flow, security, and the user experience, because a useful feature only matters if it works reliably in production.
š” Areas I specialize in
- SaaS and startup MVP development - from idea to production-ready MVP.
- Cross platform mobile app architecture - Flutter, React Native, and .NET MAUI.
- App modernization and legacy migration - Xamarin to .NET MAUI, Flutter, or React Native.
- API integration and backend connectivity - for apps that need stable data flow and real-time features.
- AI app development and product automation - for teams that want smarter app experiences.
- Continuous delivery, refactoring, and codebase optimization - to keep existing products moving forward.
- Mobile app development for iOS and Android - with a focus on stability, performance, and usability.
- Full stack developer support - when mobile work needs web, API, or backend coordination.
- Native app developer support - when the project needs platform-specific quality and performance.
- React Native developer support - for teams already working in JavaScript-based mobile stacks.
- Swift developer and iOS developer support - for polished Apple ecosystem apps.
- Android developer support with Kotlin - for strong native Android performance.
- Flutter developer support - for fast cross platform mobile app delivery.
- Xamarin developer support - for legacy apps that need modernization or migration.
- .NET MAUI developer support - for teams moving toward a modern Microsoft stack.
- Cross platform mobile app delivery - when one codebase needs to support iOS and Android efficiently.
Iām a good fit when you need a mobile developer who can think beyond screens and help shape the full product. Whether the goal is a fresh MVP, a native app for iOS or native Android or a cross platform mobile app that can grow over time, I focus on code quality, maintainability, and practical results. I also make sure the work stays aligned with product goals, so the app is not just built well, but built in a way that supports growth and future updates.
š If you need a Flutter developer, React Native developer, Xamarin developer, .NET MAUI developer, Swift developer, iOS developer, Android developer, Kotlin developer, mobile app developer, web developer, MVP development specialist, API integration expert, or full stack developer who can bring structure to a complex build and get it shipped, Iām ready to help.
Steps for completing your project
After purchasing the project, send requirements so Vitalii can start the project.
Delivery time starts when Vitalii receives requirements from you.
Vitalii works on your project following the steps below.
Revisions may occur after the delivery date.
System design
Development planning