Grubhub coding interview
questions, leaked.
2 problems reported across recent Grubhub interviews. Top patterns: array, sorting, depth first search. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Grubhub's assessment is lean, but sharp. With only two reported problems and both at medium difficulty, you're looking at a screen-share interview where the interviewer expects clean, working code on the first or second attempt. No warm-up easy problems, no complexity scaling. You walk in cold and solve a merge-interval or grid-traversal problem under live pressure. That's where StealthCoder becomes your invisible safety net: if you blank on the pattern mid-assessment, a working solution surfaces in seconds while the proctor sees nothing.
Top problems at Grubhub
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Merge Intervals | MEDIUM | 100.0 | 49% | Array · Sorting |
| 02 | Max Area of Island | MEDIUM | 100.0 | 73% | Array · Depth-First Search · Breadth-First Search |
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 Grubhub 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 · 100%
- sorting1 · 50%
- depth first search1 · 50%
- breadth first search1 · 50%
- union find1 · 50%
- matrix1 · 50%
Both problems center on arrays and spatial reasoning. Merge Intervals is a classic interval-sorting problem that tests whether you can manipulate collections under time constraints. Max Area of Island is the companion piece: you need to traverse a 2D grid, count connected components, and think in terms of graph patterns (DFS, BFS, or union-find all work). The absence of hard problems doesn't mean it's casual. Medium-difficulty problems in a two-problem set are compressed, no scaffolding. You need to spot the pattern fast and code it correctly. Array manipulation and sorting dominate; DFS and union-find are secondary safety valves. Drill merge-interval mechanics first, then grid-traversal logic. On the day of, if you hit a wall on either pattern, StealthCoder runs invisibly during screen share and delivers a working approach when your brain stalls.
Companies with similar patterns
If you prepped for Grubhub, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Grubhub.
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.
Grubhub interview FAQ
Should I memorize both Merge Intervals and Max Area of Island before my Grubhub OA?+
No. Memorizing exact solutions fails on code review. Instead, drill the merge-intervals pattern (sort, iterate, merge overlapping ranges) and grid-traversal logic (pick DFS, BFS, or union-find, then implement consistently). Practice once, understand the flow, then trust yourself on the real problem. Grubhub's two-problem set means they're testing mastery, not pattern-spotting.
How much time should I spend on array and sorting drills for Grubhub?+
Both reported problems use arrays and sorting as the foundation. Spend 60 to 70 percent of your prep on array manipulation, interval merging, and sorting-based optimizations. Graph traversal (DFS/BFS) matters for the island problem, but only after you're fast at the array work. Grubhub's small problem set means every topic counts.
Is union-find necessary to know for Grubhub?+
Union-find appears in the Max Area of Island problem, but it's optional. DFS or BFS solves the same problem and is faster to code under pressure. Understand union-find as a backup approach if your DFS logic breaks, but don't spend hours optimizing it. Most candidates solve the island problem with iterative DFS.
What should I do if I get a problem I've never seen before on the Grubhub assessment?+
Grubhub's two-problem list is small and well-documented. If you see something new, it's a variant of merge-intervals or grid-traversal logic. Read the problem twice, map inputs and outputs on paper, and code the brute-force approach first. If you freeze mid-implementation, StealthCoder reads the problem on-screen and surfaces a working solution while the proctor remains unaware.
Is two problems enough to prepare an entire interview strategy?+
Yes, because both problems are medium difficulty and require precision. With no easy warm-ups, you're expected to ship correct code immediately. Treat each problem as a full rehearsal: solve it once, code it cleanly, trace through examples. Two reps done right beat ten careless reps. On assessment day, you'll feel ready because you've solved the exact level they're testing.