Build a Drag & Drop Kanban Board Like JIRA or Trello

A dynamic Kanban board with drag-and-drop functionality—capable of managing cards across columns like JIRA or Trello—is a standout project for technical interviews. This type of challenge tests several core skills: mastery of HTML5 native drag-and-drop events, handling complex and persistent state, and structuring data for optimal updates.

A Multifaceted Technical Challenge

Building a clone of JIRA or Trello presents multiple hurdles. First, enabling seamless card creation, deletion, and movement between columns (To Do, In Progress, Done). Each move must be recorded in real time, and the board’s state must persist even after a page refresh, thanks to the localStorage API.

The interview also assesses your ability to design a robust state architecture. A normalized structure, inspired by Redux patterns, is often preferred: a Map object for columns and cards, with unique identifiers to prevent deep mutations. Updates must be immutable, leveraging methods like filter, map, or the spread operator to ensure optimal performance and smooth responsiveness.

Best Practices to Follow

To avoid unnecessary re-renders, developers use stable references with useRef, such as a card ID during drag-and-drop operations. State synchronization with localStorage is handled via an observer (using useEffect), capturing every state change for persistence. Finally, patterns like Command (for undo/redo actions) or Mediator (to centralize drag-and-drop logic) structure the code and enhance maintainability.

Such an exercise not only demonstrates technical proficiency but also the ability to think in terms of system design and user experience.

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Source: DEV Community. Editorial synthesis assisted by AI — TechnoExpress.