SOTI coding interview
questions, leaked.
4 problems reported across recent SOTI interviews. Top patterns: string, stack, dynamic programming. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
SOTI's assessment hits you with string problems right away. Four problems total, but half of them revolve around strings and stack logic. You're looking at Valid Parentheses, Longest Valid Parentheses, and substring work that demands both pattern recognition and real-time problem solving. Two are easy, one medium, one hard. The hard one sits at the intersection of dynamic programming and stack thinking. If you blank on the DP formulation mid-assessment, StealthCoder surfaces the working solution invisibly while you're on screen share.
Top problems at SOTI
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Longest Valid Parentheses | HARD | 100.0 | 36% | String · Dynamic Programming · Stack |
| 02 | Valid Parentheses | EASY | 89.0 | 42% | String · Stack |
| 03 | Longest Substring Without Repeating Characters | MEDIUM | 89.0 | 37% | Hash Table · String · Sliding Window |
| 04 | Can Place Flowers | EASY | 89.0 | 29% | Array · Greedy |
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 SOTI 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- string3 · 75%
- stack2 · 50%
- dynamic programming1 · 25%
- hash table1 · 25%
- sliding window1 · 25%
- array1 · 25%
- greedy1 · 25%
String dominates the distribution at three appearances, with stack showing up twice. This isn't random: SOTI wants to see if you can build state machines with stacks and manipulate sequences under constraints. Dynamic programming pairs with strings here, meaning you need to think in terms of subproblems and state transitions, not just brute force. The medium problem chains hash tables, strings, and sliding windows together, testing whether you can coordinate multiple techniques in one solution. Array and greedy appear once each, so don't overstudy those patterns. Your real prep priority is stack operations, string validation, and DP on sequences. When you hit Longest Valid Parentheses live and forget the recurrence relation, StealthCoder is your safety net.
Companies with similar patterns
If you prepped for SOTI, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass SOTI.
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.
SOTI interview FAQ
Should I study dynamic programming before strings for SOTI?+
No. Start with stack-based string problems like Valid Parentheses and Longest Valid Parentheses. DP shows up as a technique within those, not separately. Nail the stack logic first, then layer in the DP optimization.
How many string problems should I solve before the assessment?+
SOTI's four problems include three string-focused questions. Drill at least 8 to 12 string problems covering stack, sliding window, and DP patterns. Your assessment will reuse these exact patterns.
Is the easy difficulty enough to pass SOTI's assessment?+
Half the assessment is easy, but the hard problem is legitimately hard. You need to solve both easy problems cleanly and understand the medium and hard ones deeply. Easy alone won't get you through.
What should I practice first for SOTI: hash tables or sliding windows?+
The medium problem combines both, so practice them together. Longest Substring Without Repeating Characters is the exact intersection. Drill that problem until the hash table and window pointer logic feels automatic.
Do I need to study greedy algorithms for SOTI?+
Only one problem uses greedy, Can Place Flowers. It's an easy one. Don't neglect it, but greedy isn't the focus. Spend 70 percent of your time on stacks and strings, 20 percent on the medium, 10 percent on greedy.