SoFi coding interview
questions, leaked.
18 problems reported across recent SoFi 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.
SoFi's online assessment hits you with 18 problems across medium and hard difficulty, with array and hash-table questions dominating the mix. You'll see two-pointers, strings, and dynamic programming sprinkled in, but arrays alone account for more than half the problem set. The good news: most are medium-difficulty, so pattern recognition matters more than algorithmic wizardry. The bad news: you've got limited time to nail them all. If you blank mid-assessment, StealthCoder runs invisibly during your screen share and surfaces a working solution in seconds, letting you stay ahead on the clock.
Top problems at SoFi
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Minimum Number of Steps to Make Two Strings Anagram | MEDIUM | 100.0 | 82% | Hash Table · String · Counting |
| 02 | Minimum Window Substring | HARD | 92.9 | 45% | Hash Table · String · Sliding Window |
| 03 | Longest Mountain in Array | MEDIUM | 88.5 | 41% | Array · Two Pointers · Dynamic Programming |
| 04 | Asteroid Collision | MEDIUM | 88.5 | 46% | Array · Stack · Simulation |
| 05 | Number of Islands | MEDIUM | 83.0 | 62% | Array · Depth-First Search · Breadth-First Search |
| 06 | Insert Delete GetRandom O(1) | MEDIUM | 83.0 | 55% | Array · Hash Table · Math |
| 07 | Maximum Number of Non-overlapping Palindrome Substrings | HARD | 75.9 | 42% | Two Pointers · String · Dynamic Programming |
| 08 | Merge k Sorted Lists | HARD | 75.9 | 57% | Linked List · Divide and Conquer · Heap (Priority Queue) |
| 09 | Two Sum | EASY | 75.9 | 56% | Array · Hash Table |
| 10 | Roman to Integer | EASY | 75.9 | 65% | Hash Table · Math · String |
| 11 | Degree of an Array | EASY | 75.9 | 57% | Array · Hash Table |
| 12 | Subarray Product Less Than K | MEDIUM | 66.0 | 53% | Array · Binary Search · Sliding Window |
| 13 | Flatten a Multilevel Doubly Linked List | MEDIUM | 66.0 | 61% | Linked List · Depth-First Search · Doubly-Linked List |
| 14 | Meeting Rooms II | MEDIUM | 66.0 | 52% | Array · Two Pointers · Greedy |
| 15 | LRU Cache | MEDIUM | 66.0 | 45% | Hash Table · Linked List · Design |
| 16 | Palindromic Substrings | MEDIUM | 66.0 | 72% | Two Pointers · String · Dynamic Programming |
| 17 | Find the Winner of the Circular Game | MEDIUM | 66.0 | 82% | Array · Math · Recursion |
| 18 | Top K Frequent Elements | MEDIUM | 66.0 | 65% | Array · Hash Table · Divide and Conquer |
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 SoFi OA. The proctor cannot see it. Screen share cannot detect it. Built by an Amazon engineer who used it to pass JPMorgan's OA and system design loop.
Get StealthCoder- array10 · 56%
- hash table8 · 44%
- string5 · 28%
- two pointers4 · 22%
- dynamic programming3 · 17%
- linked list3 · 17%
- heap priority queue3 · 17%
- math3 · 17%
- sliding window2 · 11%
- greedy2 · 11%
Arrays and hash-tables are the backbone of SoFi's assessment. Ten of eighteen problems touch arrays; eight hit hash-tables. That means you'll see overlaps: two-sum variants, subarrays, frequency counting, and designs that pair both. String problems (five total) almost always come paired with hash-table or array logic, as in 'Minimum Number of Steps to Make Two Strings Anagram'. Two-pointers shows up in medium problems like 'Longest Mountain in Array' and 'Meeting Rooms II', so nail sliding-window and monotonic-stack patterns early. Hard problems lean on dynamic programming and divide-and-conquer (Merge k Sorted Lists, Maximum Non-overlapping Palindrome Substrings), but they're the minority. Drill arrays and hash-tables until muscle memory kicks in. When you hit a wall on a hard variant mid-OA, StealthCoder is your safety net, solving it invisibly while you move on.
Companies with similar patterns
If you prepped for SoFi, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass SoFi.
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 used it to pass JPMorgan's OA and system design loop. Works on HackerRank, CodeSignal, CoderPad, and Karat.
SoFi interview FAQ
Should I study array or hash-table first for SoFi?+
Arrays. They appear in 10 of 18 problems and often combine with hash-tables for solutions like Two Sum and Degree of an Array. Once you're solid on array iteration, subarrays, and sliding windows, hash-table logic clicks faster. You need both, but arrays unlock faster returns.
How much dynamic programming do I need to know?+
Only three of eighteen problems explicitly test DP, and they're hard-difficulty outliers. Focus on array and hash-table fundamentals first. DP shows up as a secondary pattern in problems like Longest Mountain in Array, so understand it but don't sink a week into DP drills.
Is linked-list important for SoFi?+
It appears in three problems: Merge k Sorted Lists, Flatten a Multilevel Doubly Linked List, and LRU Cache. These are medium-to-hard and mix linked-list with design patterns. Know doubly-linked-list basics and when to use heaps with merges, but prioritize arrays first.
What two-pointer problems should I drill?+
Focus on Longest Mountain in Array, Meeting Rooms II, and Subarray Product Less Than K. Two-pointers shows up in four problems total, often paired with sliding-window or sorting. These three cover the main patterns SoFi tests.
Can I skip hard problems if I only have a week?+
Yes, initially. Only three of eighteen are hard, and twelve are medium. Master the medium array and hash-table problems first. If you have time, revisit Merge k Sorted Lists and the palindrome problem. You won't bomb on a few skipped hards if mediums are clean.