Requirements

Functional Requirements:

• Create / update / delete tasks
• Assign tasks to users or teams
• Categorize tasks (tags, projects, priority)
• Set deadlines and reminders
• Track progress (status, % complete)
• Comment and collaborate
• View dashboards (My Tasks, Team Tasks, Overdue)
• Receive notifications (email / push / in-app)
• Search and filter tasks

Non-Functional Requirements:

• Scalable to millions of users
• Low latency (<200ms for most requests)
• High availability
• Real-time collaboration
• Secure (auth, permissions)
• Mobile + Web friendly UX

API Design

Define the APIs expected from the system. This is your chance to analyze and define the read and write paths so that you can come up with the high-level design...

High-Level Design

Web Frontend

• Purpose: Provides the user interface for interacting with the application. Built using modern web technologies such as React or Angular for a responsive and interactive experience.
• Responsibilities: Handling user inputs, rendering tasks, and providing visual feedback based on user interactions.

Mobile Frontend

• Purpose: Delivers a native or hybrid mobile application interface, allowing access from smartphones and tablets.
• Responsibilities: Similar to the web frontend but optimized for mobile experiences, including touch interactions and mobile-specific functionalities.

API Gateway

• Purpose: Serves as the single entry point for all client requests, directing them to the appropriate backend services. It helps in request routing, composition, and protocol translation.
• Responsibilities: Authentication, authorization, request routing, load balancing, and API metering.

Task Management Service

• Purpose: Core backend service responsible for managing all task-related operations.
• Responsibilities: Task creation, modification, deletion, and querying tasks based on various criteria.

User Management Service

• Purpose: Manages user profiles and authentication details.
• Responsibilities: User registration, login, profile updates, and user authentication.

Notification Service

• Purpose: Handles sending notifications to users about task updates, due dates, and other alerts.
• Responsibilities: Integrating with email services, push notification services, and possibly SMS for sending timely updates.

Database

• Purpose: Central storage for all application data, including tasks, users, comments, and categories.
• Responsibilities: Data persistence, ensuring data integrity, and supporting high-volume data access efficiently.

Search and Reporting Service

• Purpose: Provides advanced search capabilities across tasks and generates reports on user activity and task statuses.
• Responsibilities: Indexing task data, supporting complex search queries, and generating performance reports.

Detailed Component Design

Deep dive into 2-3 key components. Explain how they work, how they scale, discuss tradeoffs, capacity, and any relevant algorithms or data structures.