You will get Web App in 3 months from expert react developer | NextJS, NodeJS, React
Top Rated
Project details
🌟Over 10 years, we've successfully completed 600+ projects and delivered top-tier solutions to clients in the US and Europe. Trust us to build exceptional web applications that redefine user experiences.
Choosing us to create your web application is a win-win strategy.
✔️Experience
✔️Customization
✔️ User-Focused Design
We bring all this to your web app. Timely delivery, scalability, and ongoing support are our promises. Your success is our mission!
📞Before making a purchase, I suggest you conduct a quick intro call to get to know your requirements more.
I also can help as front end developer , front end developer react , front end designer , shopify front end developer , front end web developer
Choosing us to create your web application is a win-win strategy.
✔️Experience
✔️Customization
✔️ User-Focused Design
We bring all this to your web app. Timely delivery, scalability, and ongoing support are our promises. Your success is our mission!
📞Before making a purchase, I suggest you conduct a quick intro call to get to know your requirements more.
I also can help as front end developer , front end developer react , front end designer , shopify front end developer , front end web developer
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included $50
These options are included with the project scope.
$50
- Delivery Time 70 days
- Number of Revisions 2
- Design Customization
- Content Upload
- Responsive Design
- Source Code
Frequently asked questions
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YM
Yuriy M.
Apr 2, 2026
Front End Developer | React Developer Needed
YM
Yuriy M.
Mar 30, 2026
Front End Developer | React Developer Needed for Dashboard Tweaks
Very satisfied working with Sergii and Halo Lab, work has been done quickly with corresponding quality
YM
Yuriy M.
Mar 3, 2026
React Frontend Developer for Crypto Dashboard Tweaks
Working with Sergii and Halo Lab was outstanding. Highly recommended for any type of work
LL
Lucie L.
Feb 25, 2025
Website development
KR
Kelson R.
Nov 20, 2024
QA Testing for the Application
We were very impressed at the diligent QA! We have a React Native / Expo mobile application. Sergii worked closely with the developer to coordinate successful releases, type up detailed QA plan, and find edge case bugs. We saw a noticeable improvement in the stability of our mobile app once we began working with him. Highly recommend!
About Sergii
Front end developer | Front end developer React | Front end web dev
100%
Job Success
Odessa, Ukraine - 1:43 pm local time
📍 No short-term projects
📞 Kick-off with the team is mandatory
🧨 Available for a quick project start
★ Top-100 Service Provider by Clutch
★ $500M+ Raised by clients
★ 99+ International Awards
★ 15+ years of expertise (NOKIA, OPERA, OPPO, UDEMY, AUTH0, etc.)
👋 Hi, I'm Sergii!
I'm a senior web developer, full stack developer Next.js specialist, and front end developer with 10+ years of experience building SaaS platforms, eCommerce products, AI applications, and custom web solutions.
Over the years, I've helped launch 100+ products using React, React NextJS, Next.js, and modern JavaScript frameworks. My work combines technical architecture, front-end engineering, and product thinking to create fast, scalable applications that deliver measurable business results.
🏆 Why Clients Work With Me
✔ 100+ React, React Next, and Next.js projects delivered
✔ 50+ fully launched products across SaaS, AI, fintech, and eCommerce
✔ $500M+ raised by companies I've supported
✔ 20+ Upwork clients and long-term partnerships
✔ 30+ Shopify and Shopify Webflow projects completed
✔ Mobile and web products used by thousands of daily users
✔ Extensive experience as a front end developer React and front end Next specialist
🚀 Core Expertise
📌 Front-End Development
As a front end developer, front end web developer, and front end designer, I've built interfaces for startups, enterprise products, and high-growth SaaS companies.
Using React, React NextJS, Next.js, TypeScript, Tailwind, and modern UI frameworks, I create scalable applications focused on performance, maintainability, and user experience.
My front-end work has helped companies reduce load times, improve conversion rates, and accelerate product delivery through reusable component systems and scalable architecture.
📌 React & Next.js Development
I've delivered 100+ projects using React, React Next, and Next.js, including SaaS platforms, dashboards, marketplaces, AI tools, and enterprise applications.
As a front end developer React specialist and full stack developer Next expert, I focus on building high-performance applications with clean architecture, SSR, SEO optimization, and long-term scalability.
📌 Mobile App Development
Beyond web applications, I have extensive experience in mobile app development using React Native.
I've helped teams launch mobile apps for healthcare, fintech, logistics, education, and SaaS businesses. As a mobile app developer, I work across the entire product lifecycle—from mobile app design and architecture to deployment and optimization.
My experience includes React Native Mobile applications, cross-platform development, and React Native Full Stack solutions connected to modern APIs and cloud infrastructure.
📌 Shopify & Webflow Solutions
I've worked on 30+ Shopify and Shopify Webflow projects, helping brands improve storefront performance, customer experience, and conversion rates.
As a Shopify front end developer, I build custom themes, Shopify Hydrogen storefronts, and modern eCommerce experiences using Liquid, React, and headless architectures.
I also collaborate closely with Webflow teams, helping businesses bridge design and development through scalable Webflow implementations and front-end optimization.
📌 AI & Python Integrations
As a front end developer Python specialist, I've worked on AI-powered products featuring OpenAI integrations, vector search, chat interfaces, workflow automation, and custom dashboards.
My experience includes Python APIs, automation workflows, AI assistants, and modern SaaS products powered by LLM technologies.
💻 Technology Stack
React • React Next • React NextJS • Next.js • React Native • React Native Mobile • React Native Full Stack
TypeScript • JavaScript • Node.js • NestJS • Express • Fastify
Shopify • Shopify Webflow • Webflow • WordPress
MongoDB • PostgreSQL • MySQL
AWS • Google Cloud • Azure
Tailwind • Storybook • GraphQL • Redux
🔥 What Clients Hire Me For
✔ Front End Developer React projects
✔ Full Stack Developer Next.js applications
✔ React Native Mobile App Development
✔ Shopify Front End Developer services
✔ Webflow and Shopify Webflow implementations
✔ Front End Designer and UI implementation
✔ Front End Developer Python integrations
✔ SaaS platforms and enterprise applications
✔ Mobile App Design and development
✔ Custom Web Development solutions
💎 Why Work With Me
I combine the expertise of a web developer, front end developer, mobile app developer, and full stack developer into one delivery process.
Clients work with me because I don't just build features—I help create products that scale, perform, and generate business value.
Whether you need a front end developer React specialist, Shopify front end developer, React Native full stack engineer, mobile app developer, Webflow expert, or full stack developer Next.js partner, I'd be happy to discuss your project.
Steps for completing your project
After purchasing the project, send requirements so Sergii can start the project.
Delivery time starts when Sergii receives requirements from you.
Sergii works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements Workshop
The workshop is designed to facilitate a thorough discussion between the business analyst and the client to gather the necessary information for the software requirements document. This is the initial step in our requirements-gathering process.
Requirements Document and Architecture Design
The business analyst develops specification requirements, the lead developer crafts a high-level plan, outlining system components, modules, interfaces, and their interactions. This aims to guarantee scalability, reliability, and maintainability.