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Oracle Front End Interview Questions

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JavaScript coding questions​

  • Implement Squash Object — flatten a nested object into a single-level object with dot-separated keys.
  • Evaluate a basic arithmetic expression string like "1+3-2" and print the output. Handle all edge cases (no BODMAS required).
  • Find common elements between two arrays — e.g. arr1 = [1, 2, 2, 4, 5], arr2 = [3, 2, 4, 2] → [2, 2, 4]. Follow-up: extend to matrices instead of two arrays.

User interface coding questions​

  • Debug a React app: functionality is missing — fix it and make the app work end-to-end.

System design questions​

  • Design the frontend of a Jira board.
  • Design a backend system to block bot requests.
  • Design a backend system for a URL shortener (paired with discussing the high-level frontend architecture of the app you currently work on).

Insider tips from the GreatFrontEnd community​

These tips were shared by GreatFrontEnd users who have completed interviews with Oracle.

June 2025:

Interview experience for Oracle OCI ... SDE-3 role

  1. Round 1 (DSA): Given a string "1+3-2", print the output "2". Handle all edge cases. No need to follow BODMAS rule
  2. Round 2 (JavaScript): Squash Object question on the GreatFrontend (https://www.greatfrontend.com/questions/javascript/squash-object?practice=practice&tab=coding)
  3. Round 3 (DSA): a. Similar elements between two array. arr1 = [1, 2, 2, 4, 5] arr2 = [3, 2, 4, 2] . The output should be [2, 2, 4]. b. Follow up on the same question by giving matrix instead of the two array.
  4. Round 4 (System Design): Design the frontend of Jira Board
  5. Round 5 (System Design): Design a backend system to block a bot request
  6. Round 6 (Coding + System Design): (a) Debug a react app. (Functionality is missing from the App. Fix and make the functionality of the App work), (b) High level frontend architecture of the app that you are currently working, (c) Design a backend system for URL shortener

And at least one behavioural question in each round.

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