I built Streaky to solve a personal problem - I kept losing my GitHub streak on busy days. It monitors your contribution streak and sends notifications to Discord/Telegram before it breaks.

*What makes it interesting technically:*

1. *Distributed Cron Processing*: Used Cloudflare Service Bindings to bypass the 30-second CPU limit. Each user gets processed in an isolated Worker instance with its own CPU budget.

2. *Idempotent Queue System*: D1-based queue with atomic operations prevents duplicate processing when cron jobs overlap or retry.

3. *Zero-Knowledge Security*: GitHub tokens never stored (OAuth refresh flow), webhooks encrypted with AES-256-GCM, notifications sent via isolated Rust proxy.

4. *Rate Limit Solution*: Cloudflare Workers use shared IP pools which trigger rate limits from Discord/Telegram. Solved by routing notifications through a dedicated Rust server on Koyeb.

*Tech Stack:* - Frontend: Next.js 15, React 19, TypeScript - Backend: Cloudflare Workers + D1 (SQLite) - Infrastructure: Rust notification proxy - Auth: GitHub OAuth via NextAuth.js v5

*Live demo*: https://streakyy.vercel.app

The project is fully open-source under MIT license. Happy to answer any questions about the architecture or implementation!