In Memory Interview Questions
3 interview questions in our bank cover In Memory, most of them Coding & Leetcode-style Questions. They average 3.3/5 difficulty — medium — and each one was reported by a candidate after a real interview. Companies known to ask about In Memory: Databricks, OpenAI.
Practice these on the problems board →Companies that ask about In Memory
Question mix
- Coding & Leetcode-style Questions3
Difficulty
- 3/5 — medium2
- 4/5 — hard1
Questions tagged In Memory
In-Memory Revenue Tracker with Referral Attribution
3/5Designed around Databricks engineering interviews, this problem challenges candidates to build an in-memory revenue tracking platform with built-in referral attribution. The exercise tests data modeling skills for handling hierarchical relationships, where incoming revenue from referred users partially benefits their referrers. Developers must design efficient APIs and internal structures to handle rapid updates and aggregated balance queries. Access to the full problem specifications and a production-grade model solution requires a paid subscription.
Coding & Leetcode-style QuestionsDatabricksHit Counter with Rolling-Window QPS
3/5Design and implement a high-performance data structure for Databricks that tracks event frequencies over sliding temporal periods. The challenge asks you to record timestamped occurrences and efficiently calculate throughput metrics across dynamic time intervals under high-concurrency constraints. It tests your knowledge of time-window algorithms and memory management. Access to the full problem statement, complexity analysis, and efficient code solution requires a subscription.
Coding & Leetcode-style QuestionsDatabricksImplement a Minimal SQL-Like Query Engine Over an In-Memory Database
4/5Implement a miniature query layer over records held in memory, supporting exact-match filters on several fields that combine like a conjunctive where clause. Asked at OpenAI, this question is about interface design as much as lookup speed: you choose the signatures, so the reviewer sees exactly how you think about extensibility. You will decide between scanning and indexing per field, compose filters without duplicating code, and say what happens when a filter names a field that does not exist. The full problem and reference engine require a subscription.
Coding & Leetcode-style QuestionsOpenAI
In Memory interview FAQ
- How many In Memory interview questions are there?
- 3 reported questions, mostly Coding & Leetcode-style Questions.
- Which companies ask In Memory questions?
- Databricks (2), OpenAI (1).
- How hard are In Memory questions?
- They average 3.3 out of 5: 2 at 3/5, 1 at 4/5.