WebSockets Interview Questions 2026
Published July 22, 2026 · Updated July 22, 2026
3 WebSockets interview questions from Atlassian, Adobe, Microsoft. All difficulty levels, all roles. Upvoted by engineers who were asked them.
3 questions
Companies: Atlassian, Adobe, Microsoft
137 upvotes
WebSockets Questions by Company
Atlassian (1)
Atlassian
Hard
System Design round
Distributed SystemsWebSockets
Design Jira's real-time collaborative issue editor (multiple teammates editing the same ticket simultaneously).
Cover: Operational Transformation vs CRDTs, conflict resolution, last-write-wins vs merge, and how you persist the final state while keeping latency low for users on slow connections.
↑ 45 upvotes · 44 engineers asked this · SDE2
Adobe (1)
Adobe
Hard
System Design round
Distributed SystemsWebSocketsAWS
Design Adobe's document collaboration system (similar to Google Docs for PDFs).
Multiple users can annotate and comment on a PDF simultaneously.
Cover: conflict-free annotation merging, storing annotation deltas vs full snapshots, real-time sync via WebSockets, and how you export the final annotated PDF.
↑ 43 upvotes · 41 engineers asked this · SDE2
Microsoft (1)
Microsoft
Hard
System Design round
Distributed SystemsWebSockets
Design a collaborative code editor like VS Code Live Share. Multiple developers edit the same file simultaneously with cursors visible to all.
Cover: OT vs CRDT, undo/redo in a collaborative context, and low-latency sync across regions.
↑ 49 upvotes · 30 engineers asked this · SDE2
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Frequently asked questions
Design Jira's real-time collaborative issue editor (multiple teammates editing the same ticket simultaneously).
Design Jira's real-time collaborative issue editor (multiple teammates editing the same ticket simultaneously).
Cover: Operational Transformation vs CRDTs, conflict resolution, last-write-wins vs merge, and how you persist the final state while keeping latency low for users on slow connections.
Design Adobe's document collaboration system (similar to Google Docs for PDFs).
Design Adobe's document collaboration system (similar to Google Docs for PDFs).
Multiple users can annotate and comment on a PDF simultaneously.
Cover: conflict-free annotation merging, storing annotation deltas vs full snapshots, real-time sync via WebSockets, and how you export the final annotated PDF.
Design a collaborative code editor like VS Code Live Share. Multiple developers edit the same file simultaneously with cursors visible to all.
Design a collaborative code editor like VS Code Live Share. Multiple developers edit the same file simultaneously with cursors visible to all.
Cover: OT vs CRDT, undo/redo in a collaborative context, and low-latency sync across regions.