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Rifayu Deen

From code to company... • 17h

🧠 Saved 90% Server Costs with One Line of Code 💡 We launched Zeemail — an AI email summarizer. All good with 40 beta users… until I thought: “What happens with 100K users?” Originally, we looped through users by timezone every 15 mins. But that meant: ⚠️ 100K Firestore reads ⚠️ High costs & latency ⚠️ Poor scalability The fix? I added one field: nextSendUTC — a precomputed UTC timestamp. Now we just: ✅ Query users within the current 15-min window ✅ Ignore timezones completely ✅ Drop reads from 100K → ~1K ✅ Scale to 1M users with ease 🔥 Result: 💰 Huge cost savings ⚡ Fast cron jobs 🧠 Smart, scalable system Lesson: Write code for 10 users — design for 10M. Have optimization tips? Let’s chat!

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