Zillow coding interview
questions, leaked.
3 problems reported across recent Zillow interviews. Top patterns: array, string, stack. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Zillow's coding assessment is lean. Three problems total, split between easy and medium, with a heavy emphasis on array manipulation and graph traversal. You'll see Valid Parentheses, Number of Islands, and a binary-search array problem. If you've prepped the standard LeetCode gauntlet, you know these patterns. If you haven't, an afternoon of drilling these three will close most gaps. StealthCoder is your failsafe if you blank on the traversal logic mid-assessment and need a working solution in seconds.
Top problems at Zillow
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Valid Parentheses | EASY | 100.0 | 42% | String · Stack |
| 02 | Number of Islands | MEDIUM | 89.3 | 62% | Array · Depth-First Search · Breadth-First Search |
| 03 | Find First and Last Position of Element in Sorted Array | MEDIUM | 89.3 | 47% | Array · Binary Search |
Frequencies derived from public community-tagged interview reports. Click a row to view on LeetCode.
You have a week, maybe less. You can't out-grind the list above. StealthCoder runs invisibly during the actual Zillow OA. The proctor cannot see it. Screen share cannot detect it. Made for the engineer who has done the work but might still blank with a webcam pointed at him.
Get StealthCoder- array2 · 67%
- string1 · 33%
- stack1 · 33%
- depth first search1 · 33%
- breadth first search1 · 33%
- union find1 · 33%
- matrix1 · 33%
- binary search1 · 33%
Array problems anchor the assessment, appearing twice across the three questions. You'll definitely hit an array topic first. Graph traversal (DFS, BFS, union-find) matters because Number of Islands combines all three approaches, so you need to be comfortable thinking about islands as connected components. Stack shows up in the parentheses problem, which is a classic that trips people who haven't seen it. Binary search rounds it out. The difficulty skews easy to medium, which means precision beats speed. You don't get partial credit, so incomplete solutions on the sorted-array problem will hurt. Drill array ranges and island logic hard. If you hit a wall on traversal during the live assessment, StealthCoder surfaces a working island solution in real time without the proctor seeing it.
Companies with similar patterns
If you prepped for Zillow, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Zillow.
Memorizing every problem above in a week is a fantasy. StealthCoder is the hedge: an AI overlay that's invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Made for the engineer who has done the work but might still blank with a webcam pointed at him. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Zillow interview FAQ
Should I study union-find before the Zillow assessment?+
Number of Islands is the only problem that touches union-find, and DFS is the faster approach for most people. Union-find is a hedge, not essential. Prioritize DFS and BFS, then revisit union-find if you have extra time. The assessment doesn't require it.
How much time should I spend on the parentheses problem?+
Valid Parentheses is easy difficulty and a classic. Spend 30 minutes max understanding the stack pattern, then move on. You'll either know it or you won't. The medium problems are where time investment pays off.
What should I drill first for Zillow?+
Number of Islands. It's medium difficulty and hits five topics at once. Once you understand DFS on a matrix, the binary-search array problem feels smaller. Valid Parentheses is a warmup, not a blocker.
Is three problems enough to prepare from?+
Three problems is a tight sample. You can be confident on these three patterns, but Zillow may throw edge cases or variations. Drill these solid, then do 5-10 similar island and binary-search problems to build pattern recognition for the live assessment.
Will I see hard problems on the Zillow assessment?+
Not based on the reported data. This assessment is easy and medium only. That means the bar is execution and correctness, not heroic algorithm knowledge. Off-by-one errors and logic gaps will tank you.