BE: Implement Notification System

[Pvsaint]

Description

Build a comprehensive notification system supporting email, SMS, and push notifications for transaction updates, security alerts, and system notifications.

Acceptance Criteria

• Email notifications (transaction confirmations, security alerts)
• SMS notifications for critical events
• Push notifications for mobile apps
• Notification preferences management
• Template system for notifications
• Delivery status tracking
• Notification history and analytics

Technical Requirements

• Email service integration (SendGrid/AWS SES)
• SMS service integration (Twilio)
• Push notification service (Firebase)
• Template engine (Handlebars/Mustache)
• Queue system for reliable delivery
• Retry mechanisms and dead letter queues

API Endpoints

• POST /api/notifications/send
• GET /api/notifications/preferences
• PUT /api/notifications/preferences
• GET /api/notifications/history

[snehasharma76]

Hey, I have experience working on the API integration for some of my recent projects, like a full-stack application and i am looking to make some contributions to strengthen it.

[clintjeff2]

Hi @Pvsaint,

I'm Jefferson Youashi, a full-stack developer and DevOps engineer with extensive experience building scalable systems using Node.js, NestJS, TypeScript, PostgreSQL, Redis, Docker, AWS (S3, SES, EC2, IAM), Firebase, MongoDB, and Jenkins. I specialize in designing resilient microservices with support for background jobs, queuing, real-time messaging, and notification systems. I’ve previously integrated services like Twilio, SendGrid, and Firebase Cloud Messaging in multi-channel messaging infrastructures.

For this task, I’ll architect a robust notification system with email (SendGrid/AWS SES), SMS (Twilio), and push (Firebase) support. Notification preferences will be user-configurable with a templating engine (Handlebars) and queue-backed delivery using Redis or BullMQ. I’ll ensure delivery status tracking, retries, and dead-letter queues for failure resilience. The system will expose secure REST endpoints to send notifications, manage preferences, and retrieve histories. Analytics can be optionally exposed through a metrics endpoint or integrated with a dashboard.

Estimated completion time: 30 hours
Telegram: @JeffersonYouashi