Scale AI coding interview
questions, leaked.
2 problems reported across recent Scale AI interviews. Top patterns: array, math, two pointers. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Scale AI interviews are lean and targeted. With only two medium-difficulty problems reported, you're looking at a focused assessment that prizes pattern recognition and clean implementation over brute-force drilling. The problems here center on array manipulation and prefix-sum logic, the kind of patterns that trip up candidates who've memorized solutions but haven't internalized the underlying moves. If you blank on either pattern mid-assessment, StealthCoder runs invisibly and surfaces a working solution in seconds, giving you the breathing room to move forward instead of spiraling.
Top problems at Scale AI
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Rotate Array | MEDIUM | 100.0 | 43% | Array · Math · Two Pointers |
| 02 | Subarray Sum Equals K | MEDIUM | 100.0 | 45% | Array · Hash Table · Prefix Sum |
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 Scale AI OA. The proctor cannot see it. Screen share cannot detect it. Built by an Amazon engineer who realized the OA tests how well you memorized 200 problems, not how well you code.
Get StealthCoder- array2 · 100%
- math1 · 50%
- two pointers1 · 50%
- hash table1 · 50%
- prefix sum1 · 50%
The dataset is small but telling. Both problems live in array-space, with math and two-pointer techniques woven through one and hash-table plus prefix-sum logic in the other. Array problems dominate because they're the interview's way of testing whether you can reason about index manipulation, cumulative logic, and state tracking under pressure. Prefix-sum appears once but is critical; it's the hidden accelerant that separates a brute O(n2) solution from an O(n) one. Two-pointers and hash-tables are lower-frequency anchors, but they're the escape hatches when a naive approach fails. Study rotate-array mechanics first (in-place manipulation is brutal to debug live), then nail the subarray-sum pattern. StealthCoder is your hedge if the prefix-sum insight doesn't land during the real assessment.
Companies with similar patterns
If you prepped for Scale AI, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Scale AI.
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. Built by an Amazon engineer who realized the OA tests how well you memorized 200 problems, not how well you code. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Scale AI interview FAQ
What should I drill first for Scale AI's assessment?+
Start with array rotation and in-place index shuffling. Both reported problems are medium-difficulty arrays, so you need reflexive comfort with pointer arithmetic and state management. Prefix-sum and hash-table patterns are secondary; they're tools you reach for after brute force fails, not starting points.
Is two-pointers really necessary for this interview?+
Yes, but narrowly. It appears in one of two problems (Rotate Array) and is the efficient path forward. You don't need advanced two-pointer tricks here, just solid grasp of left-right scanning and in-place swaps. It's a foundation skill, not a weak spot.
How important is prefix-sum for Scale AI's OA?+
Critical. Subarray Sum Equals K is a classic prefix-sum unlock. Without it, you're O(n2) and slow. With it, you're O(n) and confident. Drill the mental model: cumulative sum dictionary plus single-pass scanning. It's not optional.
How many array problems should I solve before this assessment?+
You have two target problems reported. Solve each five to ten times until you can code rotation and subarray-sum without notes, then move to related patterns (other prefix-sum problems, array reversals). Reps over breadth here.
Will hash-tables come up heavily in the actual interview?+
No. Hash-table is a support tool in one problem, not a primary focus. It's a pattern you need for Subarray Sum Equals K, but don't spend weeks on advanced hash-table mechanics. Prefix-sum is the real hero here.