Illia D.

Many products look great in the mockup but fall apart in production: fragile APIs, slow backends, broken authentication, and a frontend that no longer matches the design. I solve this across the whole stack, from the database to the final rendered component. **What you get:** A complete application built end to end, backend and frontend together, not isolated pieces. Scalable React interfaces with clean component architecture, predictable state management, and reusable patterns. A reliable REST or GraphQL API with clean business logic, proper authentication, roles, and safe data handling. Clean, maintainable code on both sides, plus smooth animations and micro-interactions. **Core skills and technologies:** Frontend: React as the core (hooks, context, custom hooks, component composition), state management (Redux, Zustand, React Query), TypeScript for predictable and safe code, Next.js for SSR and routing, API-driven interfaces with role-based UI states, plus solid CSS3 and SCSS to bring designs to life responsively across all screen sizes. Backend: Node.js with Express and Nest.js, REST APIs and GraphQL, databases including PostgreSQL and MongoDB, authentication and authorization (JWT, OAuth, role-based access), third-party integrations, and solid architecture and data-schema design. **How I work:** I build applications with a real understanding of how everything fits together, from the database structure to the final interface. That means clear contracts between frontend and backend, fewer misunderstandings, fewer revisions, and predictable results. Complex sections, adaptive behavior, and heavy logic are handled carefully, without hacks or fragile solutions. **Best fit for:** Startups that need a finished product delivered turnkey. Teams looking for a single developer to own the full cycle. Projects where both interface quality and backend reliability matter. MVPs that need to launch fast and correctly. If you need a fullstack developer who ships a product that looks right, works right, and stays maintainable as it grows, this is the right match.