Arseniy

Tisyachnik

Developed a high-performance e-commerce ecosystem using Next.js 15 (App Router) and a microservices-oriented Fastify architecture. Key Technical Achievements: Frontend: Built with React 19, TypeScript, Zustand, and TanStack Query. Features a responsive UI, i18n support, and animations (Framer Motion, Lenis). Backend: Robust REST API via Fastify, Prisma ORM, and PostgreSQL. Optimized for security (CORS, Helmet, Rate Limiting). Core Logic: Architected a multi-step checkout with complex validation (Zod), Nova Poshta integration, and dual-payment processing. Admin & Ops: Secure JWT-authenticated dashboard with real-time Recharts analytics, S3/Sharp image processing, and automated Telegram order notifications. DevOps & QA: Hybrid deployment (Cloudflare Pages/VPS), comprehensive Vitest coverage (unit/smoke tests), and Sentry error tracking. Project: atta-porcelain.com

Designed and developed a scalable, custom-built e-commerce platform. Technical Stack: Frontend: React.js and JavaScript for a responsive, seamless user experience. Backend: Node.js, Express.js, and custom REST API architecture. Database: PostgreSQL for efficient management of products, users, and orders. DevOps/Tools: Git, Docker, and seamless API integrations for payments and analytics. Key Achievements: Modular Architecture: Engineered a maintainable system designed for easy scalability and clean code implementation. Advanced CMS: Built a comprehensive admin dashboard for full control over product catalogs, real-time order tracking, and user data. Data-Driven Analytics: Implemented a module to monitor sales, user behavior, and conversion funnels to drive business insights. Security & Performance: Optimized endpoints for fast load times and secure data handling. Project: mano-ceramics.com