TaskFlow (Real-Time Kanban)
Enterprise-grade real-time collaborative Kanban tool. Engineered with React, Redux Saga, Node.js, Socket.IO, and secure Session authentication under a strict layered architecture.
1. Overview & System Scope
TaskFlow is an enterprise-grade collaborative Kanban board modeled after tools like Trello and Jira. Designed to handle bidirectional real-time synchronization and complex asynchronous states across multi-user environments without compromising data integrity or UI responsiveness.
2. System Architecture & Tech Stack
Client (React + Vite · TypeScript · Chakra UI)
│── 1. Real-Time Sync (Socket.IO Client)
│ └──► Room-Based Channels (joinBoard, cardMoved, columnUpdated)
│── 2. Asynchronous State Management (Redux + Redux Saga)
│ └──► Optimistic UI Drag-and-Drop + Rollback on Failure
└── 3. REST API Ingestion (Axios withCredentials + Sessions)
└──► Express.js Server (Docker Compose)
├── Middleware (Session Guard, Handshake Verification, Central Error Handling)
├── Layered Design (Routes → Controllers → Services → Repositories)
└── PostgreSQL Database (Atomic Transactions for Positional Reordering)
3. Full-Stack Engineering Architecture
- Frontend & Async State: React (Vite) and TypeScript foundation, leveraging Redux + Redux Saga for complex asynchronous side effects and WebSocket flows, styled with Chakra UI.
- Layered Backend (Clean Architecture): Node.js, Express, and TypeScript structured under Route → Middleware → Controller → Service → Repository → Database patterns.
- Database & Transaction Safety: PostgreSQL with Prisma/TypeORM integration; atomic database transactions preventing corruption during multi-row card reordering.
- Real-Time Event Streams (WebSocket): Socket.IO room-based isolation (joinBoard/leaveBoard) with authenticated Session handshake verification.
- Containerization & DevOps: Multi-service Docker and Docker Compose orchestration powering the API and PostgreSQL with automated migrations.
4. Engineering Challenges & Solutions
- Real-Time Concurrency: Preventing event loops across active sessions by utilizing board room isolation (socket.to(room).emit) paired with client-side optimistic UI updates.
- Positional Order Integrity: Maintaining consistent sequential indices across source and target columns during drag-and-drop operations via atomic transactional writes.
- Authenticated Socket Security: Protecting socket handshakes with secure Session verification to eliminate unauthorized event listeners on sensitive board rooms.