Stripe Software Engineer Coding & Algorithms Interview Questions
Practice 40 real Coding & Algorithms interview questions for Software Engineer roles at Stripe.
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Calculate Per-User Usage Charges
This question evaluates algorithmic data aggregation, numeric billing computations, and the ability to model proration and threshold semantics across ...
Assign tasks to workers with types and accounts
This question evaluates algorithmic scheduling and dynamic resource-allocation skills, including priority-queue/heap usage, time-based simulation, and...
Plan bicycle routes on a city map
You are given a city bicycle network as a weighted graph where edges encode distance, bike-lane availability, elevation gain, and traffic risk. Comput...
Implement stateful connection router simulator
You are implementing a simplified connection router / load balancer for a Jupyter-like multi-tenant server system. There are N target servers, indexed...
Implement multi-network card validator with Luhn
Design and implement a payment card validation module that supports multiple networks and error scenarios. Requirements: 1) Luhn checksum - Implement ...
Detect Trigger and Resolve Events
You are given transaction logs sorted by non-decreasing timestamp. Each log record has four fields: - timestamp: integer time in seconds - merchant_id...
Process Transactions and Compute Balances
This question evaluates a candidate's ability to implement stateful transaction processing, accurate integer bookkeeping across accounts and currencie...
Design a subscription email scheduler with changes and renewals
Implement an email notification scheduler for subscription accounts. Inputs: - send_schedule: a mapping whose keys include: • "start": label to send...
Implement Card Validation and Recovery System
Question Design and implement a payment-card validation system supporting: Basic VISA validation (16-digit numbers starting with 4) using the Luhn che...
How to find the cheapest flight within K stops
This question evaluates understanding of graph algorithms and constrained shortest-path modeling, focusing on reasoning about weighted directed edges,...
Compute balances with transaction fees and rejections
This question evaluates transaction processing, ledger state management, handling of edge cases like insufficient funds and fixed fees, and efficient ...
Implement multi-part cost calculator
You are given a price catalog and a list of orders. Implement the following in any language (Python examples acceptable): Inputs - price_catalog: mapp...
Implement Luhn-based card validation and inference
Question Implement a set of utilities for credit-card validation and inference using the Luhn checksum algorithm and standard brand patterns. Brand pa...
Generate Available 30-Minute Time Slots
This question evaluates date/time arithmetic, interval and recurrence handling, edge-case reasoning, and test-case design within scheduling logic for ...
Implement tiered shipping calculator
Implement tiered shipping calculator Implement in JavaScript a shipping-cost calculator with three progressively richer pricing models based on a conf...
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...
Process multi-currency payments with fees
This question evaluates a software engineer's competency in precise integer arithmetic and rounding semantics, multi-currency FX conversion with basis...
Implement Billing Coding Exercises
This question evaluates skills in billing and payment reconciliation, datetime normalization and comparison, subscription-based scheduling, API integr...
Compute currency conversions with graph algorithms
Question You are given a set of pairwise currency exchange relations such as A:B = 1:1.5 and B:C = 1:1.5, meaning 1 A = 1.5 B and 1 B = 1.5 C. Design ...
Convert bitmap into ASCII characters
Question Given an array/string of 0-1 bits representing a bitmap font, write code to render each character as a grid using '.' for 0 and '#' for 1, an...