Vasyl S.

I'm a full-stack developer with over 5 years of commercial experience. I build and improve web applications, dashboards, backend systems, and service integrations using React, Next.js, Node.js, JavaScript, and TypeScript. I work on both new products and existing applications: building features, connecting services, investigating bugs, and improving the code that keeps a product running. How I can help - Frontend development: React and Next.js interfaces, admin panels, dashboards, forms, and data-heavy screens - Backend development: Node.js, Express, and NestJS APIs, authentication, permissions, and background workflows - Databases: SQL and NoSQL data modeling and integration, including PostgreSQL and MongoDB, plus Supabase and Firebase applications - Service integrations: third-party APIs, payments, Shopify automation, and data synchronization - AI integrations: OpenAI, Anthropic Claude, and Amazon Bedrock for application features and workflows - AWS: working with cloud services and integrating them into web applications and backend systems - Existing applications: debugging, refactoring, adding features, and making the code easier to maintain Recent projects - DecisionSignal: built the Next.js admin dashboard, participant PWA, and NestJS API on PostgreSQL, including multi-tenant contexts, role-based access, and anonymous feedback flows. - Just Fare: worked on the React and TypeScript catering administration platform, including client operations, consumption analytics, and weekly billing workflows. - Podflow: worked on artwork-to-Shopify automation, including catalogs, mockups, multi-store publishing, background jobs, and synchronization. - Storinky: developed a book-tracking application with React, Node.js, Express, and MongoDB, including libraries, collections, authentication, and search. My core stack is React, Next.js, JavaScript, TypeScript, Node.js, Express, NestJS, PostgreSQL, and MongoDB. I also work with Prisma, Supabase, Firebase, AWS, Docker, Stripe, Shopify APIs, and different libraries and services as the project requires. I clarify the requirements and edge cases, agree on a practical first milestone, and build with maintainability and handover in mind. Send me a short description of your application and what you need built, connected, or fixed next.