MongoDB
Database loops where storage engines, indexing, and consistency questions sit alongside standard coding rounds.
Typical loop
- 1Recruiter screen
- 2Technical phone screen
- 3Onsite: coding and data-structures rounds
- 4Design round on storage and indexing
- 5Behavioral round
Asked on LeetCode
All 25 by time range →- Implement Trie (Prefix Tree)mediumHash TableStringDesignTriefrequency 100.0
- Intersection of Two ArrayseasyArrayHash TableTwo PointersBinary Search+1frequency 97.1
- Snapshot ArraymediumArrayHash TableBinary SearchDesign+1frequency 97.1
- Word BreakmediumArrayHash TableStringDynamic Programming+3frequency 97.1
- LRU CachemediumHash TableLinked ListDesignDoubly-Linked Listfrequency 89.9
- Merge k Sorted ListshardLinked ListDivide and ConquerHeap (Priority Queue)Merge Sort+1frequency 85.3
- Text JustificationhardArrayStringSimulationfrequency 85.3
- Convert JSON String to Objecthardfrequency 79.7