How often are these problems asked?
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent SoFi interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Problem database last updated: June 20, 2025
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SoFi Coding Interview Questions
17 problems · 3 Easy, 11 Medium, 3 Hard · Ranked #101 of 458
Difficulty breakdown
3 Easy
18% · avg 23%
11 Medium
65% · avg 59%
3 Hard
18% · avg 18%
Top topics
array
52.9%
hash-table
41.2%1.8x
string
29.4%
two-pointers
17.6%
dynamic-programming
17.6%
math
17.6%
Interview profile
Based on 17 reported problems, SoFi interviews are in line with industry averages - 18% Hard vs 18% overall. The majority (65%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, SoFi puts unusual emphasis on doubly-linked-list (11.8% of problems, 6.2x the industry average), counting (11.8% of problems, 3.5x the industry average), divide-and-conquer (11.8% of problems, 2.8x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (52.9%), hash-table (41.2%), string (29.4%), two-pointers (17.6%). Problems below are sorted by frequency, the ones at the top are asked most often.
All 17 problems
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Minimum Number of Steps to Make Two Strings Anagram You are given two strings of the same length s and t. In one step you can choose any character of t and replace it with another character. | Medium | Very Likely | hash-tablestringcounting | Solve |
Minimum Window Substring Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is inc... | Hard | Very Likely | hash-tablestringsliding-window | Solve |
Longest Mountain in Array You may recall that an array arr is a mountain array if and only if: | Medium | Very Likely | arraytwo-pointersdynamic-programming | Solve |
Asteroid Collision We are given an array asteroids of integers representing asteroids in a row. The indices of the asteroid in the array represent their relative position in space... | Medium | Very Likely | arraystacksimulation | Solve |
Number of Islands Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. | Medium | Very Likely | arraydepth-first-searchbreadth-first-search | Solve |
Insert Delete GetRandom O(1) Implement the RandomizedSet class: | Medium | Very Likely | arrayhash-tablemath | Solve |
Maximum Number of Non-overlapping Palindrome Substrings You are given a string s and a positive integer k. | Hard | Very Likely | two-pointersstringdynamic-programming | Solve |
Roman to Integer Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. | Easy | Very Likely | hash-tablemathstring | Solve |
Merge k Sorted Lists You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. | Hard | Very Likely | linked-listdivide-and-conquerheap-priority-queue | Solve |
Degree of an Array Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements. | Easy | Very Likely | arrayhash-table | Solve |
Two Sum Given an array of integers nums and an integer target, return the indices of the two numbers that add up to target. | Easy | Very Likely | arrayhash-map | Solve |
Top K Frequent Elements Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order. | Medium | Likely | arrayhash-tabledivide-and-conquer | Solve |
Flatten a Multilevel Doubly Linked List You are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an additional child pointer. This child pointer may o... | Medium | Likely | linked-listdepth-first-searchdoubly-linked-list | Solve |
Find the Winner of the Circular Game There are n friends that are playing a game. The friends are sitting in a circle and are numbered from 1 to n in clockwise order. More formally, moving clockwis... | Medium | Likely | arraymathrecursion | Solve |
Palindromic Substrings Given a string s, return the number of palindromic substrings in it. | Medium | Likely | two-pointersstringdynamic-programming | Solve |
Subarray Product Less Than K Given an array of integers nums and an integer k, return the number of contiguous subarrays where the product of all the elements in the subarray is strictly le... | Medium | Likely | arraybinary-searchsliding-window | Solve |
LRU Cache Design a data structure that follows the constraints of a Least Recently Used (LRU) cache. | Medium | Likely | hash-tablelinked-listdesign | Solve |
Minimum Number of Steps to Make Two Strings Anagram
SolveYou are given two strings of the same length s and t. In one step you can choose any character of t and replace it with another character.
MediumVery Likely
hash-tablestringcounting
Minimum Window Substring
SolveGiven two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is inc...
HardVery Likely
hash-tablestringsliding-window
Longest Mountain in Array
SolveYou may recall that an array arr is a mountain array if and only if:
MediumVery Likely
arraytwo-pointersdynamic-programming
Asteroid Collision
SolveWe are given an array asteroids of integers representing asteroids in a row. The indices of the asteroid in the array represent their relative position in space...
MediumVery Likely
arraystacksimulation
Number of Islands
SolveGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.
MediumVery Likely
arraydepth-first-searchbreadth-first-search
Insert Delete GetRandom O(1)
SolveImplement the RandomizedSet class:
MediumVery Likely
arrayhash-tablemath
Maximum Number of Non-overlapping Palindrome Substrings
SolveYou are given a string s and a positive integer k.
HardVery Likely
two-pointersstringdynamic-programming
Roman to Integer
SolveRoman numerals are represented by seven different symbols: I, V, X, L, C, D and M.
EasyVery Likely
hash-tablemathstring
Merge k Sorted Lists
SolveYou are given an array of k linked-lists lists, each linked-list is sorted in ascending order.
HardVery Likely
linked-listdivide-and-conquerheap-priority-queue
Degree of an Array
SolveGiven a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements.
EasyVery Likely
arrayhash-table
Two Sum
SolveGiven an array of integers nums and an integer target, return the indices of the two numbers that add up to target.
EasyVery Likely
arrayhash-map
Top K Frequent Elements
SolveGiven an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order.
MediumLikely
arrayhash-tabledivide-and-conquer
Flatten a Multilevel Doubly Linked List
SolveYou are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an additional child pointer. This child pointer may o...
MediumLikely
linked-listdepth-first-searchdoubly-linked-list
Find the Winner of the Circular Game
SolveThere are n friends that are playing a game. The friends are sitting in a circle and are numbered from 1 to n in clockwise order. More formally, moving clockwis...
MediumLikely
arraymathrecursion
Palindromic Substrings
SolveGiven a string s, return the number of palindromic substrings in it.
MediumLikely
two-pointersstringdynamic-programming
Subarray Product Less Than K
SolveGiven an array of integers nums and an integer k, return the number of contiguous subarrays where the product of all the elements in the subarray is strictly le...
MediumLikely
arraybinary-searchsliding-window
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
MediumLikely
hash-tablelinked-listdesign
Preparing for your SoFi coding interview
SoFi interviews focus heavily on array, hash-table, string problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. SoFi interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
Looking for more companies? Browse all 458 companies in our directory, or sharpen your fundamentals with our free data structure visualizers and AI-powered DSA tutor.
Frequently Asked Questions
What coding problems does SoFi ask in interviews?add
SoFi has been reported to ask 17 distinct coding problems. The most common topics are array, hash-table, string. 3 are Easy difficulty, 11 are Medium, and 3 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
How hard are SoFi coding interviews?add
Based on 17 reported problems, SoFi interviews are in line with industry averages - 18% Hard vs 18% overall. 65% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
How should I prepare for a SoFi coding interview?add
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, hash-table, string. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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