Yarn, Typescript, Javascript, Docker, Nestjs, Nginx, Eslint, Node.js, AWS ECS, REST API integrations, Modular styling, GitHub Actions, Vitest, Component libraries, Playwright, Actions, Data loaders, SPA architecture, Service-layer patterns, Testing Library, Reusable UI components, React 18, Vite, CI quality gates, Strict TypeScript, CI CD tools, Centralized API clients, React Router, Route-based data flow