Upstart coding interview
questions, leaked.
4 problems reported across recent Upstart interviews. Top patterns: array, divide and conquer, dynamic programming. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Upstart's interview is lean and focused. Four medium problems across a tight distribution means they're testing pattern recognition and implementation speed, not obscure edge cases. Arrays dominate the signal here. You're looking at problems like Maximum Subarray and Next Permutation that require solid fundamentals and clean execution under time pressure. If you blank mid-assessment, StealthCoder runs invisibly during the live OA and surfaces a working solution in seconds, giving you the buffer to move forward instead of stalling on a single problem.
Top problems at Upstart
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Maximum Subarray | MEDIUM | 100.0 | 52% | Array · Divide and Conquer · Dynamic Programming |
| 02 | Simplify Path | MEDIUM | 85.6 | 48% | String · Stack |
| 03 | Range Sum Query 2D - Immutable | MEDIUM | 66.7 | 57% | Array · Design · Matrix |
| 04 | Next Permutation | MEDIUM | 66.7 | 43% | Array · Two Pointers |
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 Upstart OA. The proctor cannot see it. Screen share cannot detect it. Built by a senior engineer who knows the OA is theater. This is the script.
Get StealthCoder- array3 · 75%
- divide and conquer1 · 25%
- dynamic programming1 · 25%
- design1 · 25%
- matrix1 · 25%
- prefix sum1 · 25%
- string1 · 25%
- stack1 · 25%
- two pointers1 · 25%
The problem set skews heavily array-based (3 of 4), which tells you Upstart cares about algorithmic thinking in the most common interview pattern. Maximum Subarray pulls in divide-and-conquer and dynamic programming simultaneously, so you need both approaches in your mental toolkit. The other three problems are cleaner: Simplify Path is a stack problem with string parsing, Range Sum Query is a design problem with prefix sums and matrix traversal, and Next Permutation is a two-pointer in-place manipulation. No hard problems means execution and correctness trump optimization tricks. Drill arrays and two-pointer logic first, then stack-based parsing. When you sit down for the live assessment, StealthCoder is your hedge for whatever pattern doesn't click immediately.
Companies with similar patterns
If you prepped for Upstart, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Upstart.
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 a senior engineer who knows the OA is theater. This is the script. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Upstart interview FAQ
Should I focus on arrays first for Upstart?+
Yes. Three of four reported problems are array-heavy, with at least two requiring you to think in both divide-and-conquer and DP frameworks. Spend 60% of prep time on array manipulation, especially subarray patterns and in-place modifications like Next Permutation.
Is dynamic programming required to pass Upstart's OA?+
Not in isolation. Maximum Subarray is the only problem that strictly needs DP concepts, but it also accepts a divide-and-conquer solution. Master both approaches to that single problem and you're set. Don't burn time on general DP drills.
How much time should I spend on stack and string problems?+
Simplify Path is the only stack-and-string problem in the set, so aim for 20% of your prep. It's a medium that tests careful parsing and stack discipline, but it's not as heavily weighted as arrays in their interview loop.
Are all four problems really medium difficulty?+
Yes. Zero easy, zero hard. That means Upstart expects fast, clean code with no hand-holding. Speed and correctness matter more than brilliant optimization. Practice these four problems under time pressure to build that reflex.
What if I freeze on the live OA?+
StealthCoder runs invisibly during your screen share and surfaces a working solution in seconds if you hit a wall. It's your safety net for whichever problem doesn't click in the moment, letting you move forward instead of burning minutes on a single solve.