Bolt coding interview
questions, leaked.
7 problems reported across recent Bolt interviews. Top patterns: array, dynamic programming, hash table. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Bolt's interview is light on volume but heavy on pattern recognition. Seven problems reported, but five are easy and one is hard, which means they're testing whether you can spot what a problem is actually asking and implement it cleanly. Arrays, dynamic programming, hash tables, and strings dominate the distribution. You'll likely see a stock-trading problem, a string anagram or character-frequency problem, and something that chains multiple techniques together. If you blank mid-assessment, StealthCoder runs invisibly during the live OA and surfaces a working solution in seconds, so you can keep moving.
Top problems at Bolt
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Best Time to Buy and Sell Stock | EASY | 100.0 | 55% | Array · Dynamic Programming |
| 02 | Check if All Characters Have Equal Number of Occurrences | EASY | 94.6 | 79% | Hash Table · String · Counting |
| 03 | Find All Anagrams in a String | MEDIUM | 80.5 | 52% | Hash Table · String · Sliding Window |
| 04 | Two Sum | EASY | 70.0 | 56% | Array · Hash Table |
| 05 | Best Time to Buy and Sell Stock III | HARD | 70.0 | 51% | Array · Dynamic Programming |
| 06 | Valid Parentheses | EASY | 61.7 | 42% | String · Stack |
| 07 | Climbing Stairs | EASY | 61.7 | 54% | Math · Dynamic Programming · Memoization |
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 Bolt OA. The proctor cannot see it. Screen share cannot detect it. Built by an Amazon engineer who used it to pass JPMorgan's OA and system design loop.
Get StealthCoder- array3 · 43%
- dynamic programming3 · 43%
- hash table3 · 43%
- string3 · 43%
- sliding window1 · 14%
- stack1 · 14%
- math1 · 14%
- memoization1 · 14%
- counting1 · 14%
The four pillars here are array, dynamic programming, hash table, and string work, each appearing three times in reported problems. That's not noise. Dynamic programming problems at Bolt aren't abstract; they're applied to real constraints like buy-sell-stock scenarios. Array and hash table problems test your ability to pick the right data structure fast. String work pairs with hash tables and sliding windows to detect patterns. The hard problem (Best Time to Buy and Sell Stock III) combines array thinking with DP state transitions, so if you've drilled the easy stock problem, you know the domain. Easy problems make up 71 percent of reports, which tells you Bolt respects your time and wants clean code over algorithmic novelty. If you hit a wall on the medium or hard problem during your OA, StealthCoder is your hedge.
Companies with similar patterns
If you prepped for Bolt, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Bolt.
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 used it to pass JPMorgan's OA and system design loop. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Bolt interview FAQ
How many array and hash table problems should I solve before a Bolt OA?+
Both appear three times in reported problems, so treat them equally. You need at least two solid array solutions (especially the stock-trading pattern) and two hash table solutions. Two Sum and the anagram problem cover the ground. Drill those, then one more of each to build speed.
Is dynamic programming weighted heavily at Bolt?+
Yes. DP appears in three of seven reported problems and shows up in easy, medium, and hard difficulty. Start with Climbing Stairs and Best Time to Buy and Sell Stock, then move to Stock III if you have time. DP is not optional here.
Should I focus on string problems or array problems first?+
Arrays first. Three array problems are reported, and most are easy. You can solve them in under thirty minutes total, build confidence, then move to strings and hash tables. Arrays are your warmup and your foundation for the harder DP problems.
What's the expected difficulty range for a Bolt OA?+
Five of seven reported problems are easy, one is medium, and one is hard. Expect to spend most of your time on the medium and hard problems. Don't get comfortable; the difficulty can jump suddenly. That's where precision matters.
Is sliding window important for Bolt interviews?+
It appears once in reported data, paired with the anagram problem. It's not a primary focus, but if you see a string problem that involves a contiguous subset or range, sliding window is the pattern. Know it, but don't over-drill it before arrays and DP.