web-app-development

Build, review, upgrade, secure, or deploy full-stack web applications and APIs. Covers MERN (MongoDB, Express, React, Node), Next.js full-stack, React/Vite SPAs with Node APIs, Django, FastAPI, and Flask, with Postgres or MongoDB. Use this skill whenever the user mentions MERN, Express, Mongoose, Next.js, React, Vite, Node, Django, FastAPI, REST API, backend, full-stack, login/auth, dashboards, CRUD apps, npm audit, CVEs or security patches, dependency upgrades, or asks which stack to choose, even if they only say "web app" or "build me a backend". Not for static marketing/landing sites or for iOS/Android apps.