JavaScript Engineer on Upwork

I build fast, modern web applications with React, Next.js, Node.js, and TypeScript. Let's bring your idea to life.

Hire Me on Upwork
How It Works

From Idea to Launch

A simple, transparent process designed to deliver results on time and on budget.

Discovery

We discuss your project goals, requirements, and timeline in a free consultation.

Proposal

I provide a detailed plan, fixed-price quote, and delivery schedule tailored to your needs.

Development

I build your application with regular updates, demos, and opportunities for feedback.

Launch & Support

I deploy your project, provide documentation, and offer ongoing maintenance and support.

Services

What I Deliver

Professional JavaScript engineering for businesses of all sizes.

⚛️

React & Next.js Development

High-performance single-page applications and server-rendered sites built with React, Next.js, and TypeScript, optimized for SEO and user experience.

🖥️

Node.js Back-End

Scalable RESTful APIs and GraphQL servers using Node.js, Express, and NestJS with secure authentication, database integration, and cloud deployment.

📱

Full-Stack Web Applications

End-to-end web applications with modern front-ends, robust back-ends, authentication, payment processing, and third-party API integrations.

🎨

UI/UX Implementation

Pixel-perfect conversion of Figma, Sketch, and Adobe XD designs into responsive, accessible, and interactive web interfaces.

🚀

Performance Optimization

Audit and improve Core Web Vitals, Lighthouse scores, load times, and runtime performance through code splitting, caching, and best practices.

🔧

Code Review & Consulting

Expert code reviews, architecture consulting, technical guidance, and mentorship for development teams and individual developers.

By the Numbers

Stats

Years of experience delivering quality JavaScript solutions.

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Years Experience
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Projects Delivered
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Happy Clients
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% Client Satisfaction
Testimonials

What Clients Say

Feedback from clients on Upwork and beyond.

★★★★★
"Illya delivered an outstanding React application for our SaaS platform. His attention to detail and code quality exceeded our expectations. Highly recommended for any JavaScript project."
— Sarah Mitchell, CTO at DataFlow
★★★★★
"Working with Illya was a great experience. He built our company website with Next.js and it performs beautifully. Communication was clear and the project was delivered ahead of schedule."
— James Rodriguez, Founder at BrightPath
★★★★★
"Illya helped us migrate our legacy codebase to TypeScript and React. The process was smooth and the results were impressive. Our development speed has improved significantly since the migration."
— Elena Kowalski, Engineering Lead at NexusAI
Pricing

Transparent Packages

Fixed-price options for common project types. Complex projects are quoted individually.

Essential

$150 / project
  • Single landing page
  • Responsive design
  • Basic SEO setup
  • Contact form integration
  • 3 business days delivery
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Business

$350 / project
  • Multi-page business website
  • React or Next.js framework
  • CMS integration
  • Performance optimization
  • 5-7 business days delivery
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Enterprise

$750+ / project
  • Complex web application
  • Full-stack development
  • Authentication & database
  • Third-party integrations
  • 2-4 weeks delivery
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FAQ

Frequently Asked Questions

Answers to common questions about my services and process.

I offer comprehensive JavaScript development services including React and Next.js front-end development, Node.js and Express back-end development, full-stack TypeScript applications, REST and GraphQL API design, database integration with MongoDB and PostgreSQL, cloud deployment on Vercel and Firebase, performance optimization, code reviews, and technical consulting for startups and established businesses.
Timelines vary depending on project complexity and scope. A simple landing page or portfolio site typically takes three to five business days. A multi-page business website with a CMS usually takes one to two weeks. Complex web applications with user authentication, databases, and third-party integrations typically require two to six weeks. I always provide a detailed timeline estimate after discussing your specific requirements during the initial consultation.
I offer three pricing tiers to accommodate different project needs. The Essential package at $150 is perfect for small landing pages and simple websites. The Business package at $350 is ideal for multi-page business sites and blogs. The Enterprise package at $750+ is designed for complex web applications requiring authentication, databases, and advanced functionality. All packages include responsive design, performance optimization, and clean, well-documented code.
Yes, React and Next.js are my primary front-end frameworks. I have extensive experience building server-side rendered applications with Next.js, static sites with Next.js export, single-page applications with React and React Router, and component libraries with TypeScript. I follow best practices including component composition, state management with React hooks and Context API, and performance optimization through code splitting and lazy loading.
Absolutely. I specialize in full-stack JavaScript development. On the back end, I build RESTful APIs and GraphQL servers using Node.js, Express, and NestJS. I work with both SQL databases like PostgreSQL and NoSQL databases like MongoDB and Firebase Firestore. I implement authentication with JWT and OAuth, handle file uploads, integrate payment gateways like Stripe, and deploy applications to cloud platforms including Vercel, Firebase, and AWS.
Yes, I offer ongoing maintenance and support for all projects I build. This includes bug fixes, dependency updates, content changes, feature additions, performance monitoring, and security patches. I can set up a retainer arrangement for regular maintenance or work on an hourly basis for occasional updates. My goal is to build long-term relationships with clients and ensure their web applications remain secure, fast, and up to date.
I have worked with clients across a diverse range of industries including e-commerce and retail, SaaS and technology startups, education and e-learning platforms, healthcare and wellness, real estate and property management, hospitality and travel, financial services and fintech, media and entertainment, and nonprofit organizations. This breadth of experience allows me to understand unique industry requirements and deliver tailored solutions that meet specific business needs.
I believe in transparent and consistent communication throughout every project. I provide daily or weekly progress updates depending on project size, share working demos or staging links at each milestone, respond to messages within 24 hours on business days, and conduct video calls for project kickoffs and major reviews. I primarily communicate through Upwork messaging but am also available on Telegram and email for established clients.
Yes, TypeScript is my default choice for all professional projects. I use it extensively with React, Next.js, Node.js, and Express to provide static type checking, improve code maintainability, reduce runtime errors, and enhance developer experience. I configure strict TypeScript settings, define comprehensive interfaces and types, and follow best practices for generic types, utility types, and type inference to ensure robust and self-documenting code.
Yes, I have extensive experience integrating a wide variety of third-party APIs and services. This includes payment processors like Stripe and PayPal, communication platforms like Twilio and SendGrid, mapping services like Google Maps and Mapbox, social media APIs like Facebook and Instagram, CMS platforms like Contentful and Sanity, analytics services like Google Analytics and Mixpanel, and authentication providers like Auth0 and Firebase Authentication.
My process begins with a free discovery consultation to understand your project goals, target audience, and technical requirements. I then create a detailed project proposal with timeline and pricing. Once approved, I set up a private Git repository and development environment. I build the application iteratively with regular demos and feedback loops. Before delivery, I perform thorough testing, optimization, and documentation. Finally, I handle deployment and provide a post-launch support period.
Getting started is simple. You can reach out to me through Upwork by inviting me to your project or sending a direct message. Alternatively, use the contact form on this website, send me an email, or message me on Telegram. I typically respond within a few hours during business days. Once I understand your project requirements, I will provide a free quote and timeline estimate. I look forward to helping you bring your web project to life with clean, professional JavaScript code.
Expertise

Technologies & Skills

Core technologies I work with daily.

JavaScript TypeScript React Next.js Node.js Express NestJS GraphQL REST API MongoDB PostgreSQL Firebase Vercel AWS HTML / CSS Tailwind CSS Git Docker CI / CD Jest
Let's Work Together

Ready to Start Your Project?

Contact me today for a free consultation and project quote.

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