Informatica coding interview
questions, leaked.
3 problems reported across recent Informatica interviews. Top patterns: array, breadth first search, matrix. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Informatica's interview is lean: three medium problems, all patterns you've likely seen before. Array manipulation, BFS on a grid, stack design. The trap isn't difficulty, it's execution speed and off-by-one errors on the live assessment. You'll get Rotting Oranges or Jump Game or Min Stack, and you need a clean solution in under 20 minutes. If you blank mid-problem during the screen share, StealthCoder runs invisible and surfaces a working implementation in seconds, so you can paste a correct solution and move on.
Top problems at Informatica
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Rotting Oranges | MEDIUM | 100.0 | 57% | Array · Breadth-First Search · Matrix |
| 02 | Min Stack | MEDIUM | 88.8 | 56% | Stack · Design |
| 03 | Jump Game | MEDIUM | 88.8 | 39% | Array · Dynamic Programming · 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 Informatica 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 · 67%
- breadth first search1 · 33%
- matrix1 · 33%
- stack1 · 33%
- design1 · 33%
- dynamic programming1 · 33%
- greedy1 · 33%
Two of three problems hit array logic, so that's your priority. Rotting Oranges combines array traversal with BFS on a matrix, a common hybrid at this stage. Min Stack is the outlier: it's a classic design question that tests whether you can optimize space and handle edge cases (what happens when you pop from an empty stack?). Jump Game ties array, DP, and greedy together, so it rewards pattern recognition. All three are medium, which means no free points, but no theoretical curveballs either. Drill Rotting Oranges and Jump Game back-to-back, because both require you to think in multiple dimensions (literally, in Rotting Oranges; conceptually in Jump Game). Min Stack is your hedge during the live OA. If you haven't optimized stack implementations in a week, StealthCoder solves it while you regroup.
Companies with similar patterns
If you prepped for Informatica, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Informatica.
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.
Informatica interview FAQ
Should I focus on array problems first for Informatica?+
Yes. Two of the three reported problems are array-based, including Rotting Oranges, which also requires BFS. Start with array manipulation and grid traversal. Jump Game comes second because it layers DP and greedy on top of arrays. You'll see more mileage drilling these than stack design alone.
Is Min Stack as common as the other two problems?+
No. It's a single-topic design question, not a hybrid. Rotting Oranges and Jump Game appear more frequently in reports. But Min Stack is high-confidence if you've built a stack with constant-time min queries before. It's your warm-up problem if you get it.
How should I approach Rotting Oranges?+
Model it as a multi-source BFS. Start by placing all rotten oranges in the queue at once, then expand level-by-level. The key is tracking time (distance from any rotten orange) and handling edges where some oranges never rot. Simulate the first pass on paper before coding.
What's the hardest part of Jump Game?+
Recognizing that you don't need DP if you think greedy: track the farthest index you can reach as you iterate left-to-right. The DP version works too, but it's slower. Understand both, then pick greedy. It's the pattern this problem rewards.
How much time should I spend on each problem during prep?+
Spend 60 percent of your time on Rotting Oranges and Jump Game combined. They're heavier and test more patterns. Min Stack is 20 minutes if you've done stack problems before. Reserve the last 20 percent for edge-case testing and off-by-one bugs, which kill candidates at this stage.