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Production applications require five critical features beyond basic functionality: analytics to understand user behavior, error tracking to catch issues before users report them, uptime monitoring to detect outages immediately, rate limiting and DDoS protection to prevent abuse and unexpected costs, and automated testing to catch bugs before deployment. Real-world examples from Stripe, Disney+, Ryanair, and a $104k Netlify bill illustrate why these features separate hobby projects from production-ready systems. The most valuable starting point is implementing analytics, error tracking, and rate limiting.