notification-system

Hands-on Java lab for learning the Factory Method Pattern in backend systems. Includes lecture examples, design evolution, and activities for building scalable, maintainable, and extensible object-creation logic.

This repository demonstrates the Observer Pattern, a behavioral design pattern. It includes a real-world example, step-by-step Java implementation, and activities to help you understand and apply the pattern effectively.

Event-driven notification system built with Java, Spring Boot & Apache Kafka idempotent producer, DLQ retry handling, strategy-pattern multi-channel dispatch, and live Prometheus/Grafana observability.

🏆 A production-grade backend powering HomeBuddy v2’s robot telemetry, command control, medication scheduling, smart dispenser automation, and event-driven notifications—designed as a real-time robotic assistance and health orchestration layer.

A Spring Boot demo showcasing RabbitMQ message publishing/consumption using Topic Exchange, durable queues, Dockerized RabbitMQ, and PostgreSQL persistence. Includes REST APIs to send notifications (Email/SMS) and visual queue activity graphs.

A pretty simple app. If your phone doesn't notify you with a sound when is connected with a bluetooth headset/speaker or classic headphones, or if you need to filter only specific apps with sound, HeadsetNotifier is for you!

Notification Queue Simulator built with Java Spring Boot + PostgreSQL. Features: Priority Queue, Retry Logic (DLQ pattern), REST API, Input Validation.

Fixing gmail notifications

Java console reminder app with multi-user support and repeat notifications.

Java project demonstrating the Factory Design Pattern using Reflection API to dynamically send notifications via Email or SMS.

Android app in Java featuring all types of static notifications, including push, alerts, and reminders, with easy customization for mobile applications.

A microservices-based notification system designed for asynchronous message ingestion, notification delivery, and scheduled sending.

signalLoop is an event-driven notification delivery system with dynamic, score-based channel selection, built on Spring Boot and Apache Kafka.

A production-grade real-time notification system for a social platform. Users receive notifications when their content is liked, commented on, or when they gain new followers. Built to demonstrate distributed systems thinking, event-driven architecture, fault tolerance, and cloud deployment.

Centralized notification platform using Spring Boot, MongoDB, and Redis Streams to deliver email, SMS, and app notifications asynchronously with templates, retries, and delivery tracking.

Notification service to notify customer via email mail - Tech use: Java, Spring Boot, Microservice, Kafka - Messaging Queues, Docker

full-stack desktop hotel management system built with Java Swing & MongoDB. Covers guest registration, room booking, PDF receipt generation, notifications, inventory tracking, and occupancy reporting.

Java project demonstrating the Factory Design Pattern using Reflection API to dynamically convert messages into PDF or Word formats.

Production-graded event-driven notification platform built with Spring Boot, Kafka, Redis, PostgreSQL, and Hexagonal Architecture.

Hands-on system design: sending push notifications to 1M users via Kafka — decoupling, idempotency, rate limiting, batching, retries + DLQ, delivery tracking.