In-Memory Database (4-Level Progressive OA)

Problem Overview

In-Memory Database - a 4-level progressive OA (90 minutes, all four levels). Implement a simplified in-memory database. The assessment is split into four levels, and each level's test suite must fully pass before the next unlocks. Level 1 - basic CRUD over records, fields and field values. Level 2 -…

• 5 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
• The rest of the problem statement — full requirements, constraints, and edge cases
• Approach and trade-offs — what passing candidates did, and the mistakes that sink people