Problem database last updated: June 20, 2025
3 problems · 0 Easy, 2 Medium, 1 Hard · Ranked #344 of 458
0 Easy
0% · avg 23%
2 Medium
67% · avg 59%
1 Hard
33% · avg 18%
Based on 3 reported problems, AppFolio interviews are significantly harder than average - 33% Hard vs 18% across all companies. The majority (67%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, AppFolio puts unusual emphasis on design (66.7% of problems, 11.5x the industry average), hash-table (66.7% of problems, 3x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (66.7%), hash-table (66.7%), design (66.7%), math (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Insert Delete GetRandom O(1) Implement the RandomizedSet class: | Medium | Very Likely | arrayhash-tablemath | Solve |
Shortest Path in a Grid with Obstacles Elimination You are given an m x n integer matrix grid where each cell is either 0 (empty) or 1 (obstacle). You can move up, down, left, or right from and to an empty cell... | Hard | Very Likely | arraybreadth-first-searchmatrix | Solve |
LRU Cache Design a data structure that follows the constraints of a Least Recently Used (LRU) cache. | Medium | Very Likely | hash-tablelinked-listdesign | Solve |
Insert Delete GetRandom O(1)
SolveImplement the RandomizedSet class:
Shortest Path in a Grid with Obstacles Elimination
SolveYou are given an m x n integer matrix grid where each cell is either 0 (empty) or 1 (obstacle). You can move up, down, left, or right from and to an empty cell...
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent AppFolio interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
AppFolio interviews focus heavily on array, hash-table, design problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. AppFolio interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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AppFolio has been reported to ask 3 distinct coding problems. The most common topics are array, hash-table, design. 0 are Easy difficulty, 2 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 3 reported problems, AppFolio interviews are significantly harder than average - 33% Hard vs 18% across all companies. 67% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, hash-table, design. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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