Saurabh DantaniFull Stack Developer

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BackendKafka & BullMQ

Notification Service Microservice

Centralized notification microservice handling email, SMS, push notifications, and in-app alerts. Features template management, delivery scheduling, retry logic, and delivery analytics with 99.9% uptime. Built with clean modular architecture, rigorous automated testing, and comprehensive logging. Designed from the ground up for high reliability, security, and lightning-fast user interactions.

Notification Service Microservice - Full Stack Architecture & Implementation

The Challenge

High-volume applications experienced email and push notification delays due to synchronous third-party API blocking.

The Solution

Built distributed notification microservice utilizing Redis BullMQ priority queues, automatic retries, and multi-channel routing.

The Impact

Processed 500,000+ notifications daily across Email, SMS, and Mobile Push with 99.9% delivery reliability.

Technologies & Tools

Node.jsExpress.jsRedisRabbitMQAWS SESTwilioDocker

Key Engineering Challenges

1Preventing third-party rate limit throttling across SendGrid, Twilio, and FCM

2Implementing smart template engines with localized multi-language variables

3Managing dead-letter queues and automated fallback routes for failed notifications

4Providing real-time delivery status webhooks to upstream client services

Results & Measurable Outcomes

Processed peak bursts of 10,000 notifications per second without backlog

Guaranteed at-least-once delivery with exponential backoff retry mechanisms

Reduced notification dispatch latency from 4s to under 120ms

Lowered SMS telephony costs by 22% using intelligent channel routing

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