Online collaboration board for real-time teamwork

Our distributed team holds planning meetings and brainstorms remotely, and we're missing a proper shared canvas. We want a web collaboration board that multiple people open at the same time and edit together, seeing each other's changes without lag. This is not a chat or a task tracker with cards and columns, but free space for drawing. Imagine an infinite canvas where colleagues paste sticky notes, sketch diagrams, place shapes and connectors, and move objects while the whole team watches the board update live. The key to the task is the real-time layer. Each participant must see live cursors of other people with their names, and selections and edits must appear without manually refreshing the page; at the same time, the board must stay coherent when two people touch the same object at once. We expect a reliable drawing engine: freehand pencil, straight lines and arrows, rectangles, ellipses, and text blocks, plus movable and scalable colored sticky notes. The user should smoothly pan and zoom the large canvas, group and lock elements, undo and redo their actions. Boards should be saved so a session can be reopened later in exactly the state it was closed, and the canvas or a selected region exported to PNG, SVG, and PDF. Make this a modern web app that works in the browser without plugins and behaves correctly on both desktop and tablet. Performance matters to us with dozens of objects and several simultaneous editors, so describe your approach to the synchronization protocol and conflict resolution. Here's what we expect in the result: — Infinite scalable canvas with pencil, shapes, arrows, text, and colored sticky notes — Real-time collaborative editing with named live cursors and presence indicator — Board saving with autosave and export to PNG, SVG, and PDF — Clean documented code, deployment instructions, and brief project handoff