Distributed Notification System
Enterprise-grade email microservice handling transactional notifications with high delivery success rate
Project Overview
A distributed notification system for enterprise applications, composed of multiple microservices (API gateway, user service, email service, template rendering, and push notifications). I worked as part of a 5-person backend team and was responsible for designing and implementing the email notification microservice, handling high-volume transactional emails with delivery guarantees and comprehensive monitoring. The overall system was designed to be horizontally scalable and fault-tolerant.
The Challenge
Problem Statement
Applications need reliable email notifications for user communications, but building a robust system requires handling retries, failures, monitoring, and scaling—all while maintaining deliverability rates.
My Role & Contributions
Backend developer on a 5-person team, contributing to architecture and core service implementation
Responsibilities
Technical Decisions
Implementation & Approach
Development Approach
Started with monolith design to understand service boundaries
Decomposed into microservices based on clear separation of concerns
Implemented message consumption with error handling and retries
Added dead-letter queue for failed message recovery
Built monitoring dashboard for system health and metrics
Created comprehensive test suite including load testing
Key Features Built
Outcomes & Results
Key Achievements
Impact
Delivered a production-ready email microservice that can be integrated into any application requiring reliable transactional notifications, with enterprise-grade reliability features.