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MongoDB interview questions

The most frequent LeetCode problems tagged to MongoDB. This is a data-only page. For process and behavioral prep, use the coding guide and behavioral guide.

Based on 5 distinct problems tagged to MongoDB in the last 6 months (0 in the last 30 days, 2 in the last 3 months, 25 all-time) across two open datasets of LeetCode company tags. Tags are user-reported, so treat frequency as a signal, not a promise.

Difficulty mix (last 6 months): Medium 80%, Easy 20%

Most tagged topics (share of problems): Array 80%, Hash Table 80%, Design 40%, Sorting 20%, Quicksort 20%, Binary Search 20%, Persistent Data Structure 20%, Linked List 20%, Doubly-Linked List 20%, String 20%

Watch out: MongoDB has thin LeetCode data. Weight the reported questions and the format notes above more than this list.

Most frequent problems

Ranked by frequency, weighted toward the last 30 days. Classics like Two Sum sit near the top of almost every company's list because users tag them everywhere. Solve those fast. The signature list below is more specific to this company.

# Problem Difficulty Last seen Topics
1 Merge Intervals Medium 3 months Array, Sorting, Quicksort
2 Two Sum Easy 3 months Array, Hash Table
3 Snapshot Array Medium 6 months Array, Hash Table, Binary Search, Design
4 LRU Cache Medium 6 months Hash Table, Linked List, Design, Doubly-Linked List
5 Word Break Medium 6 months Array, Hash Table, String, Dynamic Programming

Signature problems

Problems where MongoDB accounts for a large share of all recent tags across companies. These are the most MongoDB-specific questions in the data.

# Problem Difficulty Last seen Topics
1 Snapshot Array Medium 6 months Array, Hash Table, Binary Search, Design

Sources

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