Avalara coding interview
questions, leaked.
2 problems reported across recent Avalara interviews. Top patterns: math, string, recursion. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Avalara's coding assessment is brutal. Two problems, both hard, and both math-heavy. You're not grinding a hundred LeetCode mediums here. You're staring down "Abbreviating the Product of a Range" and "Integer to English Words" with no warm-up. The math component is unavoidable: both problems demand number theory and algorithmic thinking under pressure. String and recursion play a supporting role, but the core is pure math. If you haven't touched these patterns in a while, StealthCoder becomes your safety net during the live assessment, solving either problem invisibly the moment you hit a wall.
Top problems at Avalara
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Abbreviating the Product of a Range | HARD | 100.0 | 24% | Math |
| 02 | Integer to English Words | HARD | 67.0 | 34% | Math · String · Recursion |
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 Avalara OA. The proctor cannot see it. Screen share cannot detect it. Made by an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too.
Get StealthCoderTwo hard problems means zero room for partial credit or slow starts. Math dominates the topic distribution, appearing in both questions. "Abbreviating the Product of a Range" requires you to compress a multiplication result efficiently, not a pattern most engineers see regularly. "Integer to English Words" combines math with string building and recursion to convert numbers into written form, the kind of problem that trips up candidates who've only drilled arrays and hash tables. There's no easy entry point. You need to be confident in modular arithmetic, divisibility rules, and recursion mechanics before you sit down. If you're shaky on any of these, your prep window is closing. StealthCoder runs invisibly during the assessment and surfaces a working solution in seconds if you blank on the approach mid-problem, so you're not dead in the water if your preparation gaps show up live.
Companies with similar patterns
If you prepped for Avalara, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Avalara.
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 by an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Avalara interview FAQ
What should I study first for Avalara's assessment?+
Math fundamentals. Both hard problems are math-first. Focus on number theory, prime factorization, and modular arithmetic. Then layer in string manipulation and recursion. Skip easy-level problems entirely; Avalara doesn't ask them.
How much recursion prep do I need?+
One of the two problems uses recursion as a core mechanism. You need to be comfortable with recursive calls and backtracking, but it's secondary to the math logic. Drill five to ten recursion problems that also involve math or string conversion.
Is two problems a realistic practice run?+
No. Two hard problems with no medium buffer is punishing. Your practice sessions should include longer problem sets, but isolate these two and solve them cold under time pressure at least once each. They're the real test.
Can I skip string manipulation prep?+
Not entirely. One problem uses string topics, and it's bundled with math and recursion. You need to convert numbers to words and format output cleanly. String skills are tactical here, not strategic.
What if I can't solve these before the assessment?+
You're going in underprepared, and Avalara knows it. Read both problem statements carefully during the assessment, map out the math logic, and if you freeze, accept the safety net and focus on partial credit. Don't waste mental energy on ego.