Web applications development
Building production-grade web applications using React and Next.js with focus on performance, scalability and reliability.
Full-cycle development
I offer expert-level engineering for complex, scalable web applications, specializing in the React and Next.js ecosystem. This service transforms product concepts into production-ready platforms with a focus on real-time interaction, collaboration tools, interactive application builders, and AI-integrated products.
Applying best engineering practices, high performance and robust architecture are ensured through advanced caching and deep observability, as well as global compliance through strict adherence to accessibility (a11y), internationalization (i18n), and GDPR standards.
Tailored approach
Every stage of a product's lifecycle demands a distinct engineering approach. Depending on where your business is in its growth journey, your technical priorities will naturally shift. Whether we are rapidly prototyping a lean MVP to test your hypothesis and product market fit, scaling a high-growth platform, or modernising an established application to handle enterprise traffic, the architecture must align with your business goals.
| Growth Stage | Scale & Market Footprint | Core Architectural Focus |
|---|---|---|
| The MVP (Market Validation) | Targeted Launch and Focused early-adopter user base. Dynamic traffic driven by strategic marketing pushes and beta testing. | Speed and agility. Rapid iteration cycles, flexible data schemas, and establishing a robust foundational architecture designed for immediate user feedback. |
| The Growth Stage | Expanding Reach. National or multi-regional footprint. Consistent, compounding Daily Active Users (DAU). | Performance & Acquisition, elevating the core experience. Focus expands to advanced GEO, AIO and SEO visibility, Core Web Vitals dominance, and sophisticated state management to handle deeper user engagement. |
| Scale-Up | High-Volume Traffic. Continental reach. Managing high-concurrency events, viral growth surges, and complex user permission tiers. | Decoupling & Concurrency: Empowering independent scaling. Separating the React frontend from backend services and implementing high-throughput real-time data synchronization. |
| Enterprise (Global Ecosystem) | Massive Scale. Worldwide footprint. Mission-critical availability requiring strict compliance (GDPR/SOC2) and zero-downtime tolerance. | Localization & Multi-Team Scale: Serving content globally with near-zero edge latency. Architecting a modular codebase that empowers multiple autonomous frontend teams to ship without friction. |
What clients say
Relevant projects
FAQ
I thrive when I work on product-oriented web applications, primarily SaaS platforms with a strong focus on interactivity and real-time collaboration features.
You can learn more on the Services page
My core stack is React , Next.js, TypeScript, and Node.js. On the data side, I work with MongoDB, GraphQL, and REST APIs. For real-time features, I use WebSockets and WebRTC. I am comfortable with AWS (S3, CloudFront, EC2), Docker, and CI/CD pipelines like CircleCI or Buildkite. I also have a strong background in accessibility (a11y), internationalization (i18n), and design systems.
If you are interested in learning about the rest of the stack, you can check out my Resume, or Ask me directly.
I work on both new and established products that require improvements or optimizations. While I enjoy building new web applications from scratch, I also have extensive experience in updating legacy solutions to ensure they meet the latest standards for performance, code quality, and security.
Yes, I am open to full-time positions where I can contribute to and own product development long-term.
Let's connect!
Say hi at hi@levchenkod.com
