FullStack Chat App (1) | React 19 | Java | Redis | Postgres | Docker | Liquibase | Grafana | System

ChatHub — Part 1 | Building the Backend with Spring Boot In this series, we are building ChatHub, a WhatsApp-like chat application from scratch using Java, Spring Boot, PostgreSQL, React, Redis, WebSocket, Docker, Grafana, and other production-oriented technologies. In Part 1, we focused on building the core backend and implementing the fundamental chat functionality. Chapters: 00:00:00 Introduction 00:19:57 HLD & LLD 02:07:08 Backend start 03:05:21 Auth 05:38:48 Conversations 08:27:57 Messages What We Built Spring Boot project setup PostgreSQL database Liquibase database migrations Hibernate schema validation User registration and login Spring Security and JWT authentication Protected APIs Global exception handling Conversations and conversation members Direct and group conversations Membership and authorization rules Message sending Message sequencing Idempotent message sending Message receipts SENT DELIVERED READ User blocking and block-aware message delivery The goal of Part 1 was to establish the core backend and business rules before introducing realtime and distributed infrastructure. What's Coming Next In the upcoming parts, we'll continue building ChatHub step by step. Backend: Rate limiting System messages Redis Redis Pub/Sub WebSocket and realtime messaging Outbox pattern Push notifications Message edit and delete Message search Presence Typing indicators Multi-device support Frontend: React UI Login and registration Conversation list Chat interface Message status and receipts Realtime messaging Typing indicators Online/offline presence Group conversations Infrastructure and monitoring: Docker and Docker Compose Redis and PostgreSQL containers Grafana Application metrics Monitoring and observability By the end of the series, we'll have a full-stack realtime chat application with a production-oriented architecture. Source Code GitHub Repository: https://github.com/shahbytes404/ChatHub Tech Stack Java | Spring Boot | Spring Security | PostgreSQL | Liquibase | JWT | React | Redis | WebSocket | Docker | Grafana More parts coming soon. #Java #SpringBoot #PostgreSQL #React #Redis #WebSocket #Docker #Grafana #BackendDevelopment #FullStackDevelopment #ChatApp #SoftwareEngineering