Bulk SMS Delivery Platform
Built a high-throughput messaging queue system capable of processing nearly a million messages per hour with intelligent provider failover and real-time monitoring.
The Challenge
The client needed to send large volumes of SMS messages—think appointment reminders, notifications, and alerts—that required enterprise-level throughput and reliability.
SMS delivery is inherently unreliable—different providers have different success rates, carrier blocking is common, and messages fail for various reasons requiring intelligent retry logic.
The system needed to track every message from send to delivery, handle failures gracefully, and automatically switch providers when one route failed.
The project was built with a remote team in Ukraine, requiring careful coordination and clear architecture from the start.
My Role
Lead developer responsible for the Laravel backend, queue architecture, message routing logic, provider failover mechanisms, and the Angular frontend for monitoring and reporting. Coordinated with a remote Ukrainian development team throughout the project.
What I Did
- Built a high-throughput queueing system using Laravel capable of processing nearly 1 million SMS messages per hour—designed for enterprise-scale delivery.
- Created a real-time monitoring dashboard in Angular so the client could track message delivery rates, view failures, and monitor provider performance at a glance.
- Designed the database schema to handle millions of message records with comprehensive status tracking, timestamps, and per-provider metadata.
- Implemented automatic provider failover—when one SMS API became unreliable or blocked, the system seamlessly routed messages through backup providers.
- Built a smart retry system that detected different failure types and applied appropriate retry strategies (immediate retry, delayed retry, provider switch).
- Led the collaboration with a remote Ukrainian development team, managing distributed delivery and ensuring alignment on architecture and deadlines.
- Built robust logging and reporting so the client could reconcile message delivery and billing across multiple providers.
The Result
- Delivered a system capable of processing nearly 1 million messages per hour with 99%+ delivery rates.
- Eliminated manual intervention by automating provider failover, retry logic, and failure handling.
- Built a comprehensive tracking and monitoring dashboard providing real-time visibility into message delivery.
- Enabled the client to achieve reliable, high-volume SMS delivery across multiple routes without operational overhead.
- Successfully coordinated with a distributed Ukrainian development team to deliver the project on time.
At its core, this was a distributed queueing problem dressed up as an SMS system. The challenge wasn't just sending messages—it was sending them reliably, at scale, when providers fail, routes get blocked, and networks are unreliable. Building a system that could process a million messages an hour required real queue architecture, smart retry logic, and the ability to failover seamlessly. The remote team coordination was another layer of complexity. This was infrastructure engineering, pure and simple—the fact that it happened to be SMS was just the use case.
The Technology
My Takeaway
“High-volume messaging is a systems problem, not a messaging problem. When you're processing a million messages an hour, every decision matters—queue design, retry strategy, provider selection, failover timing. Build it right and it's invisible; build it wrong and the noise is deafening. This project taught me that reliability at scale is more about intelligent failure handling than about avoiding failures altogether.”