Stripe onsite coding: debug, integrate, build interview

Round 4 of 7 · 16 questions reported

See the whole loop

Length: 60 min
Format: Project editor with starter code and tests: fix bugs in an unfamiliar codebase, wire an external API spec into a service, or complete a skeleton in parts
They grade: Bugs found or parts finished, tests written as you go, idiomatic use of your language
AI use: Varies by session: some onsites have one AI-assisted session and an integration session without AI
Heads-up: One or two of these. Set up the IDE and debugger from the invitation before the day.

Questions Stripe asks in this round 16

Build a transaction rule engine with an AI assistantCodingWith an AI coding assistant built into the editor, implement a rule engine that reads allow and block conditions and applies them to a list of transactions. You are graded on how…
Last asked Oct 2026
Draw routes on map images fetched from an HTTP APICodingRead a JSON file of places and routes, call a remote map service to download the matching map images, then mark the places and draw lines between them on the images. The task…
Last asked Sep 2026
Fix planted bugs in an open-source library from its failing testsCodingYou get a checkout of a real open-source library (a template engine, an HTTP client or a parser) with a few bugs planted in it. Run the test suite, follow the failures into code…
Last asked Oct 2026
Match payments to invoices by memo and amountCodingA billing system has to match incoming payments to open invoices. Both arrive as comma-separated strings. - Invoice: invoiceid,amount,duedate. The amount is an integer in cents…
Last asked Sep 2026
Hotel stay email schedule with booking changesCodingA hotel wants to send each guest a set of emails around their stay. Write the code that produces the full email schedule. Input - reservations: a list of objects with guestname…
Last asked Sep 2026
Deployment windows in a recurring weekCodingDeployments are planned on a recurring week measured in minutes, from 0 to 10,079, and the same schedule repeats every week. Teams declare windows in which deployment is allowed…
Last asked Sep 2026
Build a React interface against an undocumented APICodingWith an AI coding assistant available, build a React interface on top of an API that has no documentation. Work out the endpoints and the shape of their data by exploring them…
Last asked Jun 2026
Assign code reviewers from the files changed between branchesCodingWrite a program that compares two branches of a Git repository (the reported version used the JGit library in Java), collects the files that changed, and assigns reviewers using a…
Last asked Apr 2026
Least-loaded task assignment with worker specialtiesCodingTasks arrive in a fixed order and must be handed out to a team of workers so that the work stays balanced. Each task has a unique integer id, a positive integer duration, and (in…
Last asked Jan 2026
Sliding-window request rate limiterCodingImplement a rate limiter that accepts at most limit requests in any window of ttl milliseconds. - allow(timestamp) is called once per incoming request. timestamp is in…
Last asked Dec 2025
Best currency conversion rate across exchange quotesCodingYou run a currency desk. You are given a list of quotes (from, to, rate): one unit of from buys rate units of to. A quote works only in the direction given; the reverse is…
Possibly retired
Multi-step form in ReactCodingBuild a three-step form: step 1 collects the user's basic details, step 2 their address, and step 3 shows everything for confirmation and submits. Support validation on each step…
Possibly retired
Cloud usage bill from regional hourly ratesCodingYou are writing the billing step for a cloud platform. A customer's usage report says which region they ran in and how many hours they used each service. A pricing table gives the…
Match applicant skills and versions to a job's requirementsCodingAn applicant tracking system screens candidates by the skills they list. Each applicant gives one comma-separated string of skills, strongest first. A job posting gives a…
Server load scores from a day of requestsCodingA load balancer team wants a daily stress report for its server fleet. You get three inputs for one day: - servers: lines serverid,basescore. Every server starts at its integer…
Shipping route cost pathsCodingA parcel carrier publishes its shipping routes as a list of strings. Each string has the form source:target:method:cost: - source and target are country codes. A route ships one…