Built and launched a furniture e-shop end to end with Next.js, TypeScript and PostgreSQL. Delivered a multi-step product configurator, custom CMS, admin and customer dashboards, Stripe checkout, PDF invoices and transactional emails. Integrated the warehouse system from OpenAPI documentation; added caching, database redundancy, Sentry / PostHog monitoring and automated tests. Continued the client relationship after the agency closed and managed delivery through iterative reviews.