A full-stack URL shortening service built with FastAPI and MongoDB. Users sign up, generate personal API keys, then submit long URLs to receive compact short paths via Base62 encoding with obfuscation. Each shortened URL is tied to a user account, and the API exposes endpoints for signup, login, API key creation, short-URL generation, and retrieving all URLs for a given user. Passwords are secured with Argon2id hashing.

PyAuth is a modular, production-oriented authentication backend. It issues short-lived JWTs (5-min expiry) paired with long-lived refresh tokens (configurable via env vars). Refresh tokens are hashed with a dedicated secret before storage and can be explicitly revoked. The project follows a clean layered architecture: APIs → Services → Utils, with fully separated Pydantic request/response models for every endpoint.

PyAuthUI is the client-side companion to PyAuth. Built with Next.js 15 and TypeScript, it provides the login and registration pages that talk to the PyAuth FastAPI backend. It handles JWT storage, automatic token refresh on expiry, and route-level auth guards. The project uses Tailwind CSS for styling and pnpm workspaces for dependency management.

OAuth is a Node.js server built on Fastify that handles Google OAuth 2.0 sign-in. It exposes versioned API routes under /api/v1 and keeps provider logic separated in a dedicated utils layer. The flow covers constructing the Google authorization URL, handling the redirect callback, exchanging the authorization code for access tokens, and fetching the authenticated user's profile — all wired together with clean route handlers.

A backend service for collecting and processing analytics events. Built with Express.js, it ingests tracking payloads via a dedicated collection route, validates them with Zod schemas, persists data through Prisma, and resolves visitor geo-location via an external service. The architecture is split into layers — routes, schemas, services, middleware, cache, and background jobs — with OpenAPI specs and Docker support baked in from the start.