| Atharv Dange's Projects - Full Stack Software Case Studies

Built a production-grade OpenID Connect identity provider from scratch - implemented the OAuth 2.0 Authorization Code Flow with PKCE, RS256 asymmetric JWT signing, automatic refresh token rotation with theft detection, and shipped a plug-and-play Next.js SDK for client apps.

A beautifully crafted, read-only GitHub dashboard for Android. Browse repos, explore code, track your contribution streak, and share your profile - without the pressure of taking action.

A group trip planner that pulls the plan, the money, and the people out of the group chat and into one place. Shared itinerary with list, calendar, and map views, expense splitting with settle-up, and role-based access checked on every request. My friends and I plan our trips on it.

Privacy-first, open-source web analytics. A cookieless tracker of about 3KB reports page views, visitors, referrers, goals, funnels, retention cohorts, and Core Web Vitals. Visitor IDs are salted hashes that rotate every quarter, and the raw IP is never stored. 7 people have signed up and registered 10 sites, including this portfolio.

Built a zero-dependency HTTP server framework from Node.js core modules - designed a compile-time type-safe router with parameter inference, an async onion-model middleware pipeline, and built-in rate limiting, CORS, CSRF protection, and Brotli compression. Published to npm.

A production-grade web crawler and sitemap discovery engine with background job processing, real-time progress streaming, and intelligent CSR/SSR detection for creating SEO-compliant XML sitemaps.