Opendoor coding interview
questions, leaked.
1 problems reported across recent Opendoor interviews. Top patterns: array, hash table, string. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Opendoor's interview is tight. One reported hard problem that hits multiple patterns at once: Design Excel Sum Formula. You're looking at array, hash-table, string parsing, graph traversal, topological sort, and matrix work all wrapped into one system design challenge. The problem tests whether you can build a dependency-aware calculator that handles cell references and updates efficiently. It's the kind of question where knowing the pattern matters less than architecting the solution. If you freeze mid-OA, StealthCoder runs invisible and surfaces a working approach in seconds.
Top problems at Opendoor
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Design Excel Sum Formula | HARD | 100.0 | 43% | Array · Hash Table · String |
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 Opendoor OA. The proctor cannot see it. Screen share cannot detect it. Built by an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage.
Get StealthCoder- array1 · 100%
- hash table1 · 100%
- string1 · 100%
- graph1 · 100%
- design1 · 100%
- topological sort1 · 100%
- matrix1 · 100%
The single problem in reports spans seven distinct topics, which tells you Opendoor doesn't separate concerns. They want to see how you connect ideas: parsing strings into cell addresses, using a hash table to store cell values, building a graph of dependencies, and leveraging topological sort to resolve computation order. This isn't a trick question. It's a signal that they care about your ability to reason about systems under constraints. You'll need solid fundamentals in graph structures and dependency resolution, but the real test is whether you can articulate the trade-offs (when to recompute vs. cache, how to handle circular refs). This is a hard problem, and it's the only one reported. Drill the design patterns for dependency graphs. If you hit a wall on execution during the live assessment, StealthCoder is your safety net.
Companies with similar patterns
If you prepped for Opendoor, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Opendoor.
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 engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Opendoor interview FAQ
Should I spend time on easy array and string problems before tackling this one?+
No. The reported question is hard and touches array and string as components, not as standalone drills. Focus on understanding how to parse strings into cell references and store results in arrays/hashes. Then move straight to graph and topological sort fundamentals. You don't have time to optimize easier patterns.
Is topological sort essential for Opendoor?+
Yes. The Design Excel problem requires you to resolve dependencies in order, which is exactly what topological sort does. Without it, you can't handle formulas that reference other formulas. Study Kahn's algorithm and DFS-based sorting before your OA.
How much of the problem is design vs. implementation?+
Both matter equally. You need to articulate the data structures (hash table for cells, graph for dependencies) and then code the traversal and computation logic. Start with a clear design, then code. Don't jump to implementation without a plan.
What if I can't finish the full solution during the OA?+
Get the hash-table and string parsing working first. Those are the foundation. If you run out of time on the graph traversal or topological sort, at least show a correct data model. A partial, well-structured solution beats a broken full one.
Should I worry about circular references or edge cases?+
Yes, but only after your core logic is solid. Mention cycle detection during your design phase so the interviewer knows you're thinking about it. Implement it if time allows. That's a signal you understand system constraints.