Stripe Interview Questions — Page 8

Stripe·Software Engineer·Technical Phone Screen

Apr 2026

Stripe SWE interview with a meaty CSV processing problem broken into three stages. Pure string work, no algorithms tricks, but the edge cases pile up fast if you're not careful.

Parse a multi-line CSV string line by line and validate that no field in any row is an empty string. How do you report or filter out the rows that fail?
Given a list of banned words, filter out any CSV row where a relevant field contains one of those banned words. Walk through your approach.
After filtering, take two designated columns across all remaining rows, tokenize their values, and count how many of the resulting tokens appear in a provided stop-words list. How do you handle tokenization?

“This sounds like a warmup but quoted fields with commas inside them will wreck you if you just split on commas naively.”

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Stripe·Software Engineer·Technical Phone Screen

May 2026

Stripe coding screen, felt more like a design discussion than a pure coding problem. The question was straightforward on the surface but the edge case conversation took up most of the time.

Implement an AccountScheduler class that tracks whether a given account is currently locked at a specific timestamp, given a list of known account ids and a mapping of account ids to their lock expiry timestamps.

“The core implementation wasn't the hard part, just a dict lookup and a comparison.”

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Stripe·Software Engineer·Online Assessment (OA)

May 2026

Stripe coding round for a Software Engineer role. Two problems, one somewhat familiar from forum posts and one that required building a decoder from scratch. The problems were supposed to chain together, which I didn't fully grasp until way too late.

Implement a decoder based on a provided specification, where the output feeds into a second decoding stage as part of a combined pipeline.
Solve a previously seen coding problem (circulated on forums) involving the Bitfont repository as context.

“Spent most of my time just trying to understand what was being asked.”

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Stripe·Software Engineer·Technical Phone Screen

May 2026

Stripe coding interview, got a debt-settling graph problem that looked deceptively clean until the follow-up hit. The core question was fine but the scalability piece is where things got uncomfortable.

Given a list of loan records between people (each with a lender, borrower, and amount), find the minimum number of transactions needed to settle all debts to zero.
If this debt graph scales to hundreds of people, how would you keep the algorithm efficient? What pruning or heuristics would you introduce?

“Started by computing net balances per person which felt right, then tried to explain the backtracking approach.”

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Stripe·Software Engineer·Technical Phone Screen

May 2026

Stripe integration round for a software engineer role. The payment reconciliation problem was a known one from forums but I still managed to completely fumble it, couldn't get a single piece working. Interviewer was patient and tried to help, which almost made it worse.

Design and implement a payment reconciliation system that correctly matches and accounts for transaction records.

“Misread the whole thing early on and never recovered.”

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Stripe·Software Engineer·Onsite - System Design / Architecture

May 2026

Stripe systems design interview for a software engineering role. The whole thing was one long coding/design problem about a reconciliation pipeline, and they kept layering on edge cases until I was pretty sure I'd missed something important.

You have a reconciliation pipeline that pairs transaction records across two systems and classifies each pair as matched, mismatched, unmatched on one side, or unmatched on the other. How would you produce aggregated reports showing counts and total amounts for each classification, including mismatches broken down by which field differs?
How would you handle duplicate records where the same transaction ID appears more than once on the same side of the reconciliation?
How do you classify and handle partial matches, for example when the amount agrees but the status field differs, or vice versa?
Records from different systems may carry different currencies. How would you normalize currencies before comparing amounts, and what are the failure modes?
Timestamps from the two systems may be in different timezones. How do you normalize them, and does this affect your matching logic?
Floating-point arithmetic can cause spurious mismatches when comparing monetary amounts. How would you handle this in the reconciliation pipeline?
What test cases would you write to cover each of these edge cases: duplicates, partial matches, currency differences, timezone differences, and floating-point comparisons?

“I started with a groupBy on the classification label and summed amounts, which felt obvious.”

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Stripe·Software Engineer·Hiring Manager Screen

May 2026

Behavioral round with a hiring manager at Stripe for a software engineering role. Pretty standard stuff but the project deep-dive went longer than I expected and they kept pushing on trade-offs.

Walk me through a major project you worked on, including your role, the technical challenges you faced, and what the outcome was.
Tell me about a time you had a conflict with a coworker. How did you handle it?
Describe a situation where you had to make an important decision without having all the information you needed.
Tell me about a time you missed a deadline. What happened and what did you do?

“This took up way more time than I budgeted for mentally.”

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Stripe·Software Engineer·Onsite - Behavioral / Leadership

May 2026

Behavioral round at Stripe for a software engineer role. Four questions, all pretty standard but the 'why Stripe' one required more prep than I expected if you wanted to sound like you actually meant it.

Walk me through one or two projects you've worked on that had meaningful impact, including your role, the challenges you ran into, and what came out of it.
Describe a genuinely difficult decision you had to make. What process did you use to work through it and what happened?
Why do you want to work at Stripe specifically?
What kind of work environment do you find yourself struggling in or disliking?

“I picked two projects and immediately regretted not going deeper on just one.”

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Stripe·Software Engineer·Onsite - Behavioral / Leadership

May 2026

Behavioral round at Stripe for a software engineering role. Pretty much the whole thing was about past projects and how you've handled people, problems, and pressure. Felt like they wanted real stories, not polished answers.

Walk me through a major project you led end-to-end, from the initial idea through to delivery. What were the biggest challenges and what did it actually achieve?
Tell me about a time you had to solve a difficult technical or organizational problem. How did you approach it?
Describe a situation where you had to work closely with others to get something done. What was your role and how did you handle any friction?

“This was the one I'd prepped for but still fumbled the pacing on.”

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Stripe·Software Engineer·Online Assessment (OA)

May 2026

Stripe software engineer interview, round one was an AI-assisted coding session that got sprung on me last minute. Thirty minutes of actual coding time is brutal, and the feedback I got felt disconnected from what I actually did.

Build a rule parser, broken into multiple sub-parts, within a strict time limit.

“The format changed to AI-assisted a few days before, so I went in expecting something completely different.”

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