Sofi Interview Questions
Master your tech interview with our curated database of real questions from top companies.
Implement tree ops and LRU cache
Question Implement set(index) and clear(index) for the leaves of a full binary tree initially filled with 0s, where a parent node becomes 1 only when ...
Align with PM on ranking goals
Stakeholder Alignment and De-risking a Home Page Product Ranking Initiative Context You are a data scientist asked by a PM to "rank products on the ho...
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...
Design a fintech product ranking system
Build a Personalized Ranking System for Financial Products (App Home Page) Context You are the first Data Scientist partnering with a PM to build an e...
Design a fintech homepage ranker
Personalized Product Ranking for a Fintech Home Page — End-to-End Design Context You are designing a personalized ranking system for a fintech app’s h...
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...
Determine reachability and minimum jumps
Given an array of non-negative integers nums of length n, where nums[i] is the maximum number of steps you can move forward from index i: ( 1) Determi...
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...
Implement a React CRUD Table
React CRUD Data Table — Build and Explain Context Design and implement a React application that renders a data table with full CRUD capabilities and a...
Describe Past Project And Debugging Approach
Behavioral + Technical Leadership: End-to-End Project and Production Bug Provide a recent, specific example of a project you led end-to-end. Use one c...
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...
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...