Stripe Software Engineer Coding & Algorithms Interview Questions
Practice 38 real Coding & Algorithms interview questions for Software Engineer roles at Stripe.
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Generate Account Email Notifications
You are building an email notification scheduler for user accounts. You are given: 1. A list of user accounts. Each account has: - account_id - ...
Calculate Transaction Fees
You are building a payment processor. Each transaction has an amount in cents, a payment type, and a payment status. The platform charges a percentage...
Validate transactions with risk rules and reporting
You are building a small fraud-screening validator that reads transactions from a CSV file and outputs a human-readable report. Input 1) Transactions ...
Build an Account Transfer Ledger
Implement a transaction processor for a payment platform. You are given a list of transaction records. Each record contains: - id: unique transaction ...
Find linked user records by similarity
You are given a list of user records. Each record has the following fields: - id (integer, unique) - name (string) - email (string) - company (string)...
Assign Reviewers from Changed Files
Write a Java program that helps automatically assign a code reviewer after a pull request is opened. You are given: 1. A local Git repository path. 2....
Implement Validation and String Compression
Implement the following two coding tasks. 1. CSV dataset validation You are given: - a multiline string representing CSV data; - a set of banned words...
How to settle multi-person debts in minimum transactions
Minimize Multi-Person Debt Settlement (Minimum Transactions) Given a set of loan/transfer records in the format: - transactions[i] = [from, to, amount...
Propagate runtime ID across API requests
Debug chained API requests by propagating a runtime ID You are given a sequence of 5 API requests that must be executed in order. - Request 1 (a POST)...
Implement account scheduler with locking and LRU
Design a class AccountScheduler that manages the time-based availability of a fixed set of account IDs. Initialization You are given: - accounts: a li...
Implement bitmap font render/compress/invert
Bitmap Character to Image Conversion (3 phases) You are given a bitmap lookup table (a dictionary/map) that represents a tiny “font”. - Key: a charact...
How to find the cheapest flight within K stops
Cheapest Flights Within K Stops There are n cities (numbered 0..n-1) and a list of flights: - flights[i] = [u, v, price] means there is a flight from ...
Compute balances with transaction fees and rejections
You are building a simple ledger. Inputs - A list of account names. - An initial balance for each account. - A list of transfer transactions, each wit...
Implement a CSV dataset join
Implement joinDataSet(fieldName, customerFile, processorFile, skipUnmatched). You are given two datasets represented as List<String>, where: - custome...
Implement a Datacenter Request Router
Implement a command processor for a request-routing system that manages datacenters. Each datacenter stores: - name - latitude in [-90, 90] - longitud...
Calculate Per-User Usage Charges
Implement a billing function for an AI text API. You are given usage records for a single billing cycle. Each record contains: - user_id - input_token...
Process Transactions and Compute Balances
You are given a list of financial transactions in CSV-like rows: ` account_name, timestamp, currency, amount ` - account_name is a string ID. - timest...
Generate Available 30-Minute Time Slots
You are implementing availability generation for a scheduling service. Given: - start_datetime: the inclusive beginning of a requested date-time range...
Simulate sticky load balancer with shutdown
Problem Implement a simulator for a load balancer that routes long-lived WebSocket connections across m backend servers. You receive a sequence of tex...
Process multi-currency payments with fees
You are building a small payment processor for a multi-currency wallet. Inputs 1. Wallet balances: a map balances[currency] -> integer representing th...