🚀 Project: Scalable Notification System for Voting App I built an employee voting app where user...

🚀 Project: Scalable Notification System for Voting App I built an employee voting app where user...🚀 Project: Scalable Notification System for Voting App I built an employee voting app where user...

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Mohammad Mahdi Mohajer

• Dec 4

🚀 Project: Scalable Notification System for Voting App

I built an employee voting app where users could vote anonymously and see real-time results. As the platform grew, clients needed notifications for new votes, reminders, and final results. I integrated Sendinblue for email and Slack OAuth2 so companies could connect their workspace.

To deliver the feature, I created 1️⃣ precise scheduling logic 2️⃣ dynamic email and Slack messages 3️⃣ Slack channel integration

When user traffic increased, the system faced CPU spikes. I added Celery to handle background tasks, which worked for two years. Later, when usage grew again and scaling wasn’t approved, I built a batching system that sent notifications in small groups with short pauses. This reduced CPU load and kept the app stable without extra server cost.