Sofi Interview Questions
Practice the exact questions companies are asking right now.
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Format words into wrapped/justified lines
You are given a list of words (strings with no spaces) and an integer maxWidth. Implement text formatting in two variants: Variant A — Basic word wrap...
Design market price change notifications
Design a system that notifies users when market prices change for the symbols they track. Context and requirements: - Users maintain a watchlist of sy...
Implement a multithreaded task executor with semaphores
Design and implement a thread-safe TaskExecutor that limits concurrent work using a semaphore-like mechanism. You are given an interface similar to: -...
Generate all permutations of an array
Problem Given an array nums of distinct integers, return all possible permutations of the array. A permutation is an ordering of all elements in the a...
Count numbers with same popcount up to all-ones bound
Problem For any positive integer n, define f(n) as the smallest integer >= n whose binary representation consists only of 1 bits. Equivalently, if k i...
Find the second most frequent tag
You are given a list of strings in the following repeating order: [id1, name1, tag1, id2, name2, tag2, ...] So every 3 consecutive elements describe o...
Explain GC, singleton, and OOP principles
Answer the following Java/software-engineering fundamentals questions: 1. How does Java garbage collection work at a high level (generational GC, mark...
Rearrange array to maximize positive prefix sums
Problem You are given an integer array a of length n. You may rearrange the elements in any order. Define the prefix sums of a permutation p as: - pre...
Find maximum-occurring character in a string
Problem Given a non-empty string s, return the character that occurs the most times in s. Tie-breaking If multiple characters have the same maximum fr...
Count completed car journeys from sensor logs
You are given a time-ordered list of highway sensor logs. Each log entry contains: - timestamp (integer; strictly increasing) - sensor_type (one of "E...
Implement chance of a personal best
You are given a simplified model for tracking race times on an obstacle course. - A course has a fixed number of obstacles. - A run records the time s...
Demonstrate project impact and teach something
In a hiring-manager or behavioral interview: 1. Pick one recent project and explain: - the problem and why it mattered, - your role and scope, ...
Design a Random Number Generation API
System Design: Random Number Service (REST + Streaming) You are designing a high-scale service that generates random numbers and exposes both REST and...
Explain benefits of a lockfile
When running a JavaScript app using package managers like npm or yarn, what is the purpose of a dependency lockfile (e.g., package-lock.json or yarn.l...
Solve Time-Window and Binary Swap Problems
This online assessment contained two coding problems: 1. Maximum requests in a time window You are given a non-decreasing integer array requestTimes...
Plan and validate ranking experiment
Evaluate a New Home-Page Ranking Algorithm: 3-Stage Plan Context You are introducing a new ranking algorithm for the home page. You must validate it s...
Scale a key-value store with consistent hashing
System Design: Scale a Key–Value Store with Consistent Hashing Context You have a single-server key–value store that must scale horizontally across ma...
Design a key-value store with getLast
Design and implement an in-memory key–value store with this API: add(key, value), get(key), remove(key), and getLast(). The operation getLast() must r...
Design a Real-Time Suggestions Service
System Design: Real-Time Typeahead/Autocomplete Context Design a real-time typeahead/autocomplete service for a consumer-facing web and mobile applica...
Simulate 1-D collisions and scale to huge inputs
Given an array of integers representing objects on a 1-D track, where the sign indicates direction (positive moves right, negative moves left) and the...