Website Event Alert System

I need an automated alert system tied directly to my website (and accompanying app). Any time a defined event fires on the site—think new sign-ups, orders, payment confirmations, or error spikes—I want an immediate alert so I can respond without delay.

I’m open to the most reliable notification channel you suggest: email, SMS, push, or a mix. The key is speed and clarity. You’ll set up the event listener or webhook, map the chosen events to notifications, and hand over well-commented code plus a short setup guide so I can change rules later if needed.

Deliverables
• Production-ready alert workflow triggered by website/app events
• Tested notifications reaching the chosen channel(s) in real time
• Brief documentation covering installation, configuration, and adding new events

Please outline the tech stack you’d use (e.g., Node.js with Express and Nodemailer, Python with Flask and Twilio, serverless functions, etc.) and how you’ll ensure scalability and low latency. I’ll pick the approach that fits my current infrastructure best.