You will get Web App in 3 months from expert react developer | NextJS, NodeJS, React
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Build Your Web App in Just 3 Months
Need a scalable web app built by an experienced React Developer? I create fast, secure, and user-friendly web applications using NextJS, React, and NodeJS -- from idea to launch in as little as 3 months.
What you'll get:
🛠️ Modern web app development with clean, scalable code
🎯 A custom solution tailored to your business goals
🎨 Intuitive UI/UX for an outstanding user experience
🚀 On-time delivery, ongoing support, and future-ready architecture
As a React Developer and Full Stack Developer, I build SaaS platforms, dashboards, marketplaces, internal tools, customer portals, and other custom web apps that are easy to use, maintain, and scale.
My tech stack includes React, NextJS, NodeJS, REST APIs, and modern frontend development best practices.
📞 Before placing an order, let's schedule a quick call to discuss your requirements and define the best approach for your web app.
Need a scalable web app built by an experienced React Developer? I create fast, secure, and user-friendly web applications using NextJS, React, and NodeJS -- from idea to launch in as little as 3 months.
What you'll get:
🛠️ Modern web app development with clean, scalable code
🎯 A custom solution tailored to your business goals
🎨 Intuitive UI/UX for an outstanding user experience
🚀 On-time delivery, ongoing support, and future-ready architecture
As a React Developer and Full Stack Developer, I build SaaS platforms, dashboards, marketplaces, internal tools, customer portals, and other custom web apps that are easy to use, maintain, and scale.
My tech stack includes React, NextJS, NodeJS, REST APIs, and modern frontend development best practices.
📞 Before placing an order, let's schedule a quick call to discuss your requirements and define the best approach for your web app.
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 React Front end web developer Full stack developer
100%
Job Success
Odessa, Ukraine - 1:31 am 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 front end web developer, React developer, web developer, full stack developer Next.js specialist, and front end developer React with 10+ years of experience building SaaS platforms, AI products, eCommerce solutions, and custom web applications.
Over the years, I've helped launch 100+ products using React, React NextJS, Next.js, and modern JavaScript frameworks. As a web app developer and SaaS developer, my work combines technical architecture, front-end engineering, and product thinking to create scalable applications that deliver measurable business results.
🏆 Why Clients Work With Me
✔ 100+ React, React Next, and Next.js projects delivered
✔ 50+ fully launched SaaS, AI, fintech, and eCommerce products
✔ $500M+ raised by companies I've supported
✔ 20+ long-term Upwork clients
✔ 30+ Shopify and Shopify Webflow projects completed
✔ Mobile and web products used by thousands of daily users
✔ 10+ years as a front end developer React specialist building high-performance interfaces
🚀 Core Expertise
Front-End Development React
As a front end developer React, react developer, front end web developer, and front end designer, I've built modern interfaces for startups, enterprise software, and high-growth SaaS companies that succeed.
Using React, React NextJS, Next.js, TypeScript, Tailwind, and modern UI frameworks, I develop scalable products focused on performance, accessibility, and maintainability. My front-end architecture has helped companies reduce load times, improve conversions, and accelerate development with reusable component systems.
React & Next.js Development
I've delivered 100+ React and Next.js applications, including SaaS platforms, dashboards, marketplaces, AI tools, and enterprise software.
As a front end developer React, React developer, and full stack developer Next expert, I build SSR applications, SEO-friendly architectures, scalable APIs, and reusable design systems that support long-term product growth as a full stack web developer and SaaS developer.
Mobile App Development
I also specialize in mobile app development using React Native, helping companies launch scalable cross-platform applications.
As a mobile app developer, I've delivered products for healthcare, fintech, logistics, education, and SaaS companies -- from mobile app design and architecture to deployment and optimization. My experience includes React Native Mobile applications and React Native Full Stack solutions connected to cloud infrastructure and modern APIs.
Shopify & Webflow
I've completed 30+ Shopify and Shopify Webflow projects, helping brands improve customer experience, storefront performance, and conversion rates.
As a Shopify front end developer, I build custom themes, Shopify Hydrogen storefronts, headless commerce solutions, and modern eCommerce experiences. I also work with Webflow teams to bridge design and development through scalable implementations and performance optimization.
AI & Python
As a front end developer React and Python specialist, I've contributed to AI-powered SaaS products featuring OpenAI integrations, vector search, intelligent chat interfaces, workflow automation, and custom dashboards.
My experience combines Python APIs, LLM technologies, automation workflows, and modern SaaS architecture to build AI products that scale.
💻 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 • Redux • GraphQL
📈 Proven Experience
During 10+ years as a front end web developer and front end developer react, I've helped startups and enterprise businesses launch products from MVPs to enterprise SaaS platforms. More than 100 React and Next.js applications have been successfully delivered with a focus on scalability, clean architecture, and long-term maintainability as a web developer, web app developer, and full stack web developer.
I've completed 30+ Shopify and Shopify Webflow implementations as a Shopify front end developer React, creating custom storefronts, headless commerce experiences, and conversion-focused user journeys.
💎 Whether you need a front end developer React, Shopify front end developer React, React Native Full Stack developer, mobile app developer, web developer, web app developer, SaaS developer, full stack web 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.