Stripe Bug Bash Interview: Format and How to Practice

Stripe's software engineering loop is widely reported to include a debugging round, called the bug bash or the bug squash. You get a repository you have never seen, something in it is broken, and you have under an hour to find out why. This guide separates the little Stripe says in public from what candidates and prep sites report, and gives you a way to practice. It is part of our AI coding interview overview; for how this round fits next to AI-assisted formats, see what an AI coding round is.

AICodingRound is not affiliated with Stripe. We have no copy of Stripe's interview material, and none of our problems are Stripe questions.

Rehearse the bug bash on AICodingRound. Our bug hunts give you an unfamiliar multi-file repo, a ticket that describes a symptom, and a real test suite, which is the shape candidates describe. Try Searching customers by email finds nobody (easy, about 20 min). The beta is free and places are limited: get a place.

What Stripe says on the record

Very little, and nothing about this round by name. Stripe's jobs page describes the process in general terms: an initial call with a recruiter, then "a technical or skills-based assessment" and "a series of interviews with the team you'd be joining." It adds: "Timelines vary by role, level, and location."

We found no Stripe page that describes a bug bash, its length, or its tools. Everything in the next section is reported. Treat it as a likely shape, and confirm the details for your own loop with your recruiter.

What candidates and prep sites report

A few notes on these sources. Aced says its Stripe guide is updated by Stripe candidates. Prepfully says its guide was written with input from former Stripe engineers, and it dates its last update October 24, 2026. PracHub does not give an official length and suggests one hour as a practice limit. Techinterview.org describes the task arriving as a GitHub issue with very little context (techinterview.org), but it cites no sources, so we give it the least weight.

The AI rule, and the separate AI round

This is the detail most likely to matter on the day, and it is also the least certain.

• Prepfully quotes a candidate who says AI is not allowed during the bug bash or the integration round, while looking up syntax on the web is fine.
• Aced's guide says AI coding assistants are not permitted in the integration round. Its bug bash section does not mention AI either way.
• Prepfully also describes a separate "AI-Assisted Coding" round: 60 minutes on HackerRank with a built-in AI chat, where you build a solution in parts and review the AI's output. We found this only in Prepfully's guide.

So plan to debug without an assistant, and ask your recruiter which rounds, if any, allow AI. Do not assume the rule from one round carries over to another.

What interviewers are said to watch

Aced lists reading an issue with limited context, orienting quickly in unfamiliar code, and forming and testing hypotheses. It also says interviewers weigh how well you narrate what you have ruled out, and that "a clear, well-articulated diagnosis often carries more than a completed fix" (Aced).

Prepfully frames the round as testing whether "you can take ownership of a foreign codebase the way an engineer at Stripe has to on the daily." It lists the kinds of bugs it has seen described: edge-case errors, state and data-processing faults, poor error handling, and broken API or protocol flows. Its tips: debug with testable hypotheses, keep fixes small, add a regression test for each fix. It also reports that the bugs sit on independent branches, so if you are stuck, move on and come back later (Prepfully).

Put together: the round rewards a calm, visible method more than speed.

A plan for the round

Our suggestion for a 60-minute round with several bugs. It is not a Stripe rule.

1. Before the day. Follow the setup instructions early. Clone a public repo in the same language, run its tests, and make sure your debugger and test runner work in your IDE. Every minute spent on setup in the round is a minute not spent debugging.
2. First 5 minutes. Read the issue or the failing tests. Run the suite once and list every failure. Pick the one with the clearest error message first.
3. For each bug. Reproduce it, follow the failing path from the test into the code, say a hypothesis, and check it with a print, a breakpoint or a smaller test. Fix the cause with the smallest change.
4. After each fix. Run the whole suite. A fix that turns one test green and another red is not done.
5. When stuck. Say what you have ruled out and what you would check next, then move to the next bug. Come back with fresh eyes.
6. Last 3 minutes. Summarize each fix in one sentence: the cause, and why your change is in the right place.

Questions to ask your recruiter

• Which rounds are in my loop, and is one of them a bug bash?
• Which language will the repository be in? Can I choose?
• Will I run the code on my own machine? Is there setup to do beforehand?
• Is any AI assistant allowed in this round, or in any other round?
• Can I search documentation during the round?

Asking these is normal. Interviewers would rather you spend the hour debugging than wondering about the rules.

Practice the bug bash on AICodingRound

Use tickets that start from a symptom, in apps with several files and a real test suite. Here are five from our library. Three are in Paylane, a payments API we built for practice; it is not Stripe's code and not modeled on Stripe's interview.

• Back-to-back bookings rejected (easy, Python, about 20 min). A first run of the reproduce, narrow, fix, test loop.
• Searching customers by email finds nobody (easy, Python, about 20 min). A small bug in a payments API, from a support report.
• Nightly warehouse sync misses orders (medium, Python, about 10 min). A short drill with a quiet failure.
• One merchant's order webhooks stopped arriving and the worker logs the same error forever (medium, Python, about 40 min). Start from the logs.
• After one failed customer call, every customer list for that merchant errors (medium, Python, about 45 min). The error shows up far from where it starts.

Since the bug bash is reported to ban AI, do these sessions without opening the AI. To match the reported 3 to 5 bugs in an hour, run two of the shorter problems back to back against one timer, and narrate the whole time.

When you submit, tests check the fix and that nothing else broke, and a short debrief asks you to explain the cause: the same explanation a Stripe interviewer is reported to weigh. The report gives a level per skill (Strong, Solid or Developing).

For the general method, read our guide to debugging interview practice. Rehearse the round before the real one. The beta is free and places are limited: get a place.