Moloco coding interview
questions, leaked.
7 problems reported across recent Moloco interviews. Top patterns: array, two pointers, stack. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Moloco's interview is array-first and medium-heavy. You'll get six medium problems and one hard one. Every single problem touches arrays, which means you're either comfortable with indexing, slicing, and mutations or you're going to lose time on problems that should be automatic. Two-pointers, stack-based solutions, and dynamic programming show up repeatedly. If you've prepped traditional DSA, you've seen these patterns before. The hard problem is Trapping Rain Water, which combines two-pointers, monotonic stack, and spatial reasoning. If you blank mid-assessment, StealthCoder runs invisibly and surfaces working code in seconds, so you stay calm and keep moving.
Top problems at Moloco
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Longest String Chain | MEDIUM | 100.0 | 62% | Array · Hash Table · Two Pointers |
| 02 | Design a Stack With Increment Operation | MEDIUM | 92.6 | 80% | Array · Stack · Design |
| 03 | Trapping Rain Water | HARD | 92.6 | 65% | Array · Two Pointers · Dynamic Programming |
| 04 | Number of Islands | MEDIUM | 82.2 | 62% | Array · Depth-First Search · Breadth-First Search |
| 05 | Meeting Rooms II | MEDIUM | 82.2 | 52% | Array · Two Pointers · Greedy |
| 06 | Single Element in a Sorted Array | MEDIUM | 82.2 | 59% | Array · Binary Search |
| 07 | Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | MEDIUM | 82.2 | 57% | Array · Queue · Sliding Window |
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 Moloco OA. The proctor cannot see it. Screen share cannot detect it. Made for the engineer who has done the work but might still blank with a webcam pointed at him.
Get StealthCoder- array7 · 100%
- two pointers3 · 43%
- stack2 · 29%
- dynamic programming2 · 29%
- sorting2 · 29%
- heap priority queue2 · 29%
- depth first search1 · 14%
- breadth first search1 · 14%
- union find1 · 14%
- matrix1 · 14%
Array problems account for every single submission at Moloco, so this isn't a balanced DSA interview. You need fluency with sliding windows, two-pointer traversals, and efficient scans before you walk in. Two-pointers appears in three problems directly and underlies several others. Monotonic stack and stack-based design show up in Meeting Rooms II and the hard Trapping Rain Water problem. Dynamic programming is on two problems, including Longest String Chain, which requires sorting and chaining logic. If you've drilled array fundamentals and two-pointer patterns, you're covering about 70% of the expected ground. The gap is Trapping Rain Water and design questions like the stack increment operation, which reward spatial thinking and code clarity. StealthCoder is your real-time hedge on the live assessment if you hit an edge case or forget the monotonic stack trick under pressure.
Companies with similar patterns
If you prepped for Moloco, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Moloco.
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 for the engineer who has done the work but might still blank with a webcam pointed at him. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Moloco interview FAQ
How many array problems should I solve before my Moloco interview?+
All of them. Every problem touches arrays. Aim for at least 20 to 30 reps covering two-pointers, sliding windows, and prefix sums. Focus on Trapping Rain Water and Meeting Rooms II first, since those are your hardest patterns and they compress multiple techniques into one submission.
Is dynamic programming a must-know for Moloco?+
It appears on two of seven problems, including Longest String Chain. You don't need DP mastery, but you need to recognize when a problem rewards memoization or bottom-up recurrence. Drill classic DP array problems alongside greedy and two-pointer variants.
What should I practice first for Moloco?+
Two-pointers and sliding windows. They appear in at least three problems directly and underpin several others. Get comfortable with Meeting Rooms II and Trapping Rain Water early, since they combine multiple patterns and will build confidence fast.
How hard is the Moloco interview relative to the median coding OA?+
Six mediums and one hard is above average. No easy problems means you're expected to handle nested loops, edge-case logic, and multi-step reasoning from the start. Expect no gimmes. Treat every submission as if it's LeetCode medium at minimum.
Should I study union-find or DFS before my assessment?+
DFS and BFS each appear once, and union-find once, on Number of Islands. If you're short on time, prioritize two-pointers and stack problems instead. Only circle back to graph traversal if you've already locked in arrays and two-pointer logic.